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From Conception to Birth

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From Conception to Birth

Head and Arm of a Human Fetus (Week 15)

Image by TheVisualMD

Conception

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Atom to Baby

Video by TheVisualMD

Day of Conception

Conception begins as a marathon, a race to the finish—with hundreds of millions of competitors. A single male ejaculation may contain up to 500 million sperm, but only one of them can succeed in penetrating the egg that lies ensconced in a fallopian tube, waiting to be fertilized. When that sperm finally enters the egg, instantaneously an electrical jolt alters the egg’s outer membrane so that it becomes impermeable to the other sperm, which literally fall off of the egg’s surface.

Inside the egg, the sperm’s entrance literally shakes things up. The egg protoplasm starts to shimmy violently. The nuclei of the sperm and the egg, each containing 23 chromosomes, move towards each other and shed their membranes. Within 12 hours the nuclei have merged to form a complete set of 46 chromosomes: a blueprint for an entire human being. Every inherited characteristic the individual will have—gender, eye color, skin tone, personality—is delineated in this one, tiny egg, now called a zygote. As the zygote divides, every daughter cell will carry a perfect copy of this blueprint.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (8)

Egg Cell Surrounded by Sperm Cell

Computer generated visualization of a human egg surrounded by sperm. Actual size of egg = 0.1 mm in diameter - This image presents a view of the female egg, the ovum, which contains the maternal genetic material. During the 14th day of ovarian cycle, the ovum is ejected from the ovary into the fallopian tube where it awaits fertilization. In this image, the cumulus, a halo of sugar and protein nourishment, surrounds the egg.

Image by TheVisualMD

Sperm on Egg Outer Membrane

Several sperm, after traveling up through the female reproductive system, have finally reached their target, the egg. Here they encounter the thatched outer membrane of the egg, which they must penetrate before any rival sperm do so. Once the first sperm penetrates and fuses with the egg, the membrane rapidly changes electrical charge, in effect demagnetizing. All other competing sperm literally drop off the surface of the egg. Less than 5 minutes later, a second, more permanent chemical blocking mechanism is triggered, safeguarding the unique mixture of parental genes. In reproduction, nature abhors threesomes. Still, like jilted suitors, the excluded sperm continue to flutter around the ovum for several more days. Fertilization. The process begins as the sperm penetrates an oocyte (egg). The fertilized egg then becomes a zygote. Though 300 million sperm may enter the upper part of the vagina, only 1%, 3 million, enter the uterus. Only one sperm needs to bind with the protein receptors in the zona pellucida to trigger an enzyme reaction allowing the zona to be pierced and the sperm to get in and fertilize the egg. Penetration of the zona pellucida takes about 20 minutes.

Image by TheVisualMD

Egg Cell Surrounded by Sperm Cell

Computer generated visualization of a human egg surrounded by sperm. Actual size of egg = 0.1 mm in diameter - This image presents a view of the female egg, the ovum, which contains the maternal genetic material. During the 14th day of ovarian cycle, the ovum is ejected from the ovary into the fallopian tube where it awaits fertilization. In this image, the cumulus, a halo of sugar and protein nourishment, surrounds the egg.

Image by TheVisualMD

Sperm and Oocyte During Fertilization

Computer Generated Image from Micro-MRI, actual size of zygote = 0.1 mm - This image captures the moment of fertilization, when a sperm breaks through the oocyte's outer shell and breaches the inner membrane. Once fertilized, the egg becomes a zygote, which then begins its 3-day descent to the uterus via the fallopian tubes.

Image by TheVisualMD

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Formation of Zygote

Close up of a sperm penetrating the zona pellucida to gain access into the cytoplasm of the oocyte. The camera zooms into the ooctye. Once the sperm gains access into to oocyte, it degenerates until only the nucleus and centrioles remain. The nucleus of the sperm fuses with the nucleus of the ovum to restore the diploid number (46 chromosomes) therefore creating a diploid zygote. Once the fusion is complete, fertilization is complete.

Video by TheVisualMD

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Insemination

Close up view of the zona pellucida of an oocyte. Sperm cells are trying to penetrate the zona pellucida to gain access into the cytoplasm. The camera zooms into the ooctye as one sperm penetrates. Once the sperm gains access into to oocyte, it degenerates until only the nucleus and centrioles remain. The nucleus of the sperm fuses with the nucleus of the ovum to restore the diploid number (46 chromosomes) therefore creating a diploid zygote. Once the fusion is complete, fertilization is complete.

Video by TheVisualMD

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Fusion of Sperm and Egg

Close up view of the zona pelllucida of an oocyte. Sperm cells are trying to penetrate the zona pellucida to gain access into the cytoplasm. The camera zooms into the ooctye as one sperm penetrates. Once the sperm gains access into to oocyte, it degenerates until only the nucleus and centrioles remain. The nucleus of the sperm fuses with the nucleus of the ovum to restore the diploid number (46 chromosomes) therefore creating a diploid zygote. Once the fusion is complete, fertilization is complete.

Video by TheVisualMD

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Implantation of Fertilized Egg in Lining of Uterus

Close up shot of a blastocyst as it implants itself in the lining of the uterus. Implantation is the process of attachment of the embryo to the endometrial lining of the uterine wall which will eventually connect to the mother's circulatory system. Implantation usually occurs after the blastocyst arrives in the uterus about a week after ovulation and fertilization.

Video by TheVisualMD

Egg Cell Surrounded by Sperm Cell

TheVisualMD

Sperm on Egg Outer Membrane

TheVisualMD

Egg Cell Surrounded by Sperm Cell

TheVisualMD

Sperm and Oocyte During Fertilization

TheVisualMD

0:39

Formation of Zygote

TheVisualMD

0:45

Insemination

TheVisualMD

0:45

Fusion of Sperm and Egg

TheVisualMD

0:20

Implantation of Fertilized Egg in Lining of Uterus

TheVisualMD

First Trimester

Fetal Development

1

2

3

4

Fetal Development at 8 Weeks

Interactive by TheVisualMD

First Trimester of Pregnancy (Week 1–Week 12)

During the first trimester your body undergoes many changes. Hormonal changes affect almost every organ system in your body. These changes can trigger symptoms even in the very first weeks of pregnancy. Your period stopping is a clear sign that you are pregnant. Other changes may include:

Extreme tiredness
Tender, swollen breasts. Your nipples might also stick out.
Upset stomach with or without throwing up (morning sickness)
Cravings or distaste for certain foods
Mood swings
Constipation (trouble having bowel movements)
Need to pass urine more often
Headache
Heartburn
Weight gain or loss

As your body changes, you might need to make changes to your daily routine, such as going to bed earlier or eating frequent, small meals. Fortunately, most of these discomforts will go away as your pregnancy progresses. And some women might not feel any discomfort at all! If you have been pregnant before, you might feel differently this time around. Just as each woman is different, so is each pregnancy.

Your developing baby

First trimester (week 1 - week 12)

At four to five weeks:

Your baby's brain and spinal cord have begun to form.
The heart begins to form.
Arm and leg buds appear.
Your baby is now an embryo and one-twenty-fifth inch long.

At eight weeks:

All major organs and external body structures have begun to form.
Your baby's heart beats with a regular rhythm.
The arms and legs grow longer, and fingers and toes have begun to form.
The sex organs begin to form.
The eyes have moved forward on the face and eyelids have formed.
The umbilical cord is clearly visible.
At the end of eight weeks, your baby is a fetus and looks more like a human. Your baby is nearly 1 inch long and weighs less than one-eighth ounce.

At 12 weeks:

The nerves and muscles begin to work together. Your baby can make a fist.
The external sex organs show if your baby is a boy or girl. A woman who has an ultrasound in the second trimester or later might be able to find out the baby's sex.
Eyelids close to protect the developing eyes. They will not open again until the 28th week.
Head growth has slowed, and your baby is much longer. Now, at about 3 inches long, your baby weighs almost an ounce.

Source: Office on Women's Health (OWH), U.S. Department of Health and Human Services

Additional Materials (8)

First Trimester of Pregnancy -- CVS Prenatal Test | Parents

Video by Parents/YouTube

First Trimester of Pregnancy -- Ultrasound | Parents

Video by Parents/YouTube

First Trimester of Pregnancy -- Tests and Screening | Parents

Video by Parents/YouTube

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From Conception to Birth

Explore and uncover the miraculous story of a new life forming. Conception begins when a male reproductive cell (sperm cell), successfully fuses with the female reproductive cell (egg cell). After the fusion of the sperm and egg is the fusion of their genetic materials. Cell division follows. The zygote (cell formed by the fusion of the sperm and egg) divides into two, four, eight, and so on. Changes happen in every stage of embryonic development. At 25 days, the embryo curves into C-shape and the arches that form the face and neck are becoming evident under the enlarging forebrain. The primitive heart is beating. The development of the limb buds are also visible, and the hand plates are noticeable in day 44. At 56 days, the circulatory system is given an emphasis as well as the developed organs of the embryo: the brain, heart, umbilical cord, vertebrae, stomach, kidneys, lungs, and liver. At this stage, all the major organs are in place. The genitalia of a 56 day old fetus inside womb is visible. Though the indifferent penis is visible, the sex of the baby is not clear from external appearance until week 12. At 7 months, it is noticeable that the fetus is in fetal position where the legs are drawn up, because of the limited space in the uterus. The arms, legs, and toenails are fully formed. At 9 months, the skull can be seen showing the unconnected bony plates called fontanels. These fontanels are significant for fetal brain's protection and they allow the head to elongate and mold during childbirth, then return to a rounded shape. At 9 months, the baby is ready for delivery. The baby in position for birth, the baby then rotates down, pushes out and comes out headfirst. In order to squeeze the baby through the pelvic canal, the mother's bones pop open in the middle.

Video by TheVisualMD

What to expect in your First Trimester of pregnancy | Pregnancy Week-by-Week

Video by Today's Parent/YouTube

First Trimester Pregnancy Tests | Kaiser Permanente

Video by Kaiser Permanente Thrive/YouTube

Eating well in your first trimester

Video by My Doctor - Kaiser Permanente/YouTube

What to Expect in the 1st Trimester: Q&A with Belly to Baby

Video by St. Louis Children's Hospital/YouTube

2:44

First Trimester of Pregnancy -- CVS Prenatal Test | Parents

Parents/YouTube

2:22

First Trimester of Pregnancy -- Ultrasound | Parents

Parents/YouTube

2:46

First Trimester of Pregnancy -- Tests and Screening | Parents

Parents/YouTube

4:14

From Conception to Birth

TheVisualMD

19:08

What to expect in your First Trimester of pregnancy | Pregnancy Week-by-Week

Today's Parent/YouTube

1:36

First Trimester Pregnancy Tests | Kaiser Permanente

Kaiser Permanente Thrive/YouTube

2:19

Eating well in your first trimester

My Doctor - Kaiser Permanente/YouTube

42:38

What to Expect in the 1st Trimester: Q&A with Belly to Baby

St. Louis Children's Hospital/YouTube

First Trimester Ultrasound

First Trimester Ultrasound

Also called: First Trimester Prenatal Ultrasound, First Trimester Scan, Fetal Ultrasound

A first trimester prenatal ultrasound is a noninvasive, painless, and risk-free imaging test in which an ultrasound machine is used to confirm the pregnancy, find out how far along in the pregnancy you are, and estimate your due date.

First Trimester Ultrasound

Also called: First Trimester Prenatal Ultrasound, First Trimester Scan, Fetal Ultrasound

A first trimester prenatal ultrasound is a noninvasive, painless, and risk-free imaging test in which an ultrasound machine is used to confirm the pregnancy, find out how far along in the pregnancy you are, and estimate your due date.

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Use the slider below to see how your results affect your health.
Your result is Normal.
* Your baby is growing at a normal rate.
* You have the right amount of amniotic fluid.
* No birth defects were found, though not all birth defects will show up on a sonogram.
Related conditions
The first trimester fetal ultrasound is an imaging test that uses an ultrasound machine to:
- Confirm your pregnancy
- Determine the number of embryos
- Make sure the embryo is located in your uterus (womb) instead of another location such as your fallopian tube
- See (and hear) if your baby’s heart is beating as expected
- Find out how long you’ve been pregnant (gestational age)
- Estimate your date of delivery (due date)
- Evaluate your uterus, ovaries, and cervix
Normal
Normal results will vary depending on your gestational age. During the first trimester, the pregnancy goes from no visible embryo to a visible fetus with identifiable organs.
- 0 to 4 weeks: no evidence of pregnancy in the ultrasound.
- 4 to 5 weeks: in some cases, a small structure called the gestational sac can be visualized.
- 5 weeks: the gestational sac can be identified.
- 5.5 to 6 weeks: a tiny embryo, or fetal pole, can be seen and sometimes the heartbeat can be heard. The gestational sac measures roughly 6 mm.
- 6 to 7 weeks: the fetal heartbeat can be found more easily. The gestational sac measures roughly 10 mm and the embryo measures approximately 5 mm as measured by the crown rump length (CRL), which is the length of the embryo fetus from the top of its head to its bottom.
- 7 to 8 weeks: the CRL should be between 11-16 mm.
- 8 to 9 weeks: the CRL should be between 17-23 mm and limb buds appear.
- 9 to 10 weeks: the CRL is between 23-32 mm and fetal movement can be seen.
Abnormal:
Your healthcare provider will inform you about any anomaly in your ultrasound.
The results of this ultrasound are compared to what is expected for your gestational age. If the ultrasound measurements indicate an embryo or heartbeat should be identified, and it is not, the doctor may diagnose a failed early pregnancy (missed miscarriage).
However, due to dating inaccuracies, in most cases a second ultrasound will be performed one or two weeks after the first one to confirm whether the pregnancy I viable or not. This is done because, in early pregnancy, the gestational sac and developing baby change drastically every day, so a few days can make a difference in whether the ultrasound should detect a heartbeat or reach certain measurements.
If the follow-up ultrasound shows that the pregnancy has continued developing, then it is probable that your dates were off and you have fewer weeks than initially thought.
But, if the follow-up ultrasound still shows abnormal development, the doctor can then conclusively diagnose a miscarriage.
1. https://www.healthline.com/health/pregnancy/ultrasound#purpose-anduses [accessed on Sep 12, 2020]
2. https://radiopaedia.org/articles/first-trimester [accessed on Sep 12, 2020]
3. https://www.mayoclinic.org/tests-procedures/fetal-ultrasound/about/pac-20394149#:~:text=The%20first%20fetal%20ultrasound%20is,when%20anatomic%20details%20are%20visible. [accessed on Sep 12, 2020]
4. https://www.verywellfamily.com/understand-early-pregnancy-ultrasound-results-2371367 [accessed on Sep 12, 2020]
5. https://pubs.rsna.org/doi/10.1148/rg.2015150092 [accessed on Sep 12, 2020]
6. https://radiopaedia.org/articles/early-pregnancy?lang=us [accessed on Sep 12, 2020]
7. https://radiopaedia.org/articles/crown-rump-length?lang=us [accessed on Sep 12, 2020]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (1)

5:16

How To: OB Ultrasound - Normal Pregnancy Case Study Video

Sonosite/YouTube

First Trimester Prenatal Tests

Prenatal Panel

Also called: First Trimester Prenatal Tests, Obstetric Panel, OB Panel

A prenatal panel is a group of blood tests done early in pregnancy. The tests are used to check for conditions that can affect the health of a mother and her unborn baby. The results can guide treatments, which may help prevent serious complications.

Prenatal Panel

Also called: First Trimester Prenatal Tests, Obstetric Panel, OB Panel

A prenatal panel is a group of blood tests done early in pregnancy. The tests are used to check for conditions that can affect the health of a mother and her unborn baby. The results can guide treatments, which may help prevent serious complications.

A prenatal panel is a group of blood tests done in early pregnancy. The tests check for diseases and infections that can affect the health of you and your developing baby. The results of the tests can guide treatments, which may help prevent serious complications. A prenatal panel usually includes the following tests:
- Complete blood count (CBC). This test measures many different parts of your blood, including red blood cells, white blood cells, and platelets. It also measures the physical features pf some of the cells. A CBC can help diagnose various health conditions, such as anemia, clotting disorders, and infections.
- Blood type and Rh factor. This test finds out your blood type (A, B, AB, or O) and checks your Rh factor. Rh factor is a type of protein found on the surface of red blood cells. If your blood cells have this protein, you are Rh-positive. If they don't, you are Rh- negative. If you are Rh-negative and your developing baby is Rh-positive, it's called Rh incompatibility. It may cause your body to make antibodies against your baby's blood, which can damage your baby's red blood cells.
- Rubella, also known as German measles, is a viral infection. This test shows if you are immune to (protected against) rubella. You would be immune if you have been vaccinated against rubella or infected with it in the past. If you are not immune and you get the infection during pregnancy, it could put your baby at risk for congenital anomalies (health conditions that can develop before birth).
- Hepatitis B and C are viruses that infect your liver. If you're pregnant, the hepatitis virus can be passed to your baby. Most pregnant people are tested for hepatitis B. Hepatitis C is not routinely tested because it is not common. But you may be tested if you have certain risk factors.
- Sexually transmitted infections (STIs). Usually, you will be tested for chlamydia and syphilis early in your pregnancy. You may also be tested for gonorrhea if you have certain risk factors. An STI can lead to miscarriage or infect your baby during delivery. An STI can be dangerous to a newborn. It may cause blindness, breathing problems, or other health issues.
- HIV is a virus that attacks your immune system. If you have HIV, you may pass along the virus to your baby. Many pregnant people are tested for HIV, and some states require testing.
Other names: obstetric panel, OB panel
If your results were not normal, you and/or your baby might get treatment to prevent serious health conditions. Examples of some abnormal results and treatments can include:
- Rh incompatibility. You will receive medicine that prevents your body from making the antibodies that may damage your baby's red blood cells.
- Infections (hepatitis, STIs, HIV). You will receive medicine to treat the infection. If you have a hepatitis B infection, your baby will get a vaccine within a few hours of birth.
- No immunity to rubella. You'll need to avoid anyone who has rubella while you are pregnant. After your baby is born, you should get vaccinated.
If you have questions about your results, talk to your provider.
In addition to a prenatal panel, you may also get a urine test during your first trimester. Pregnancy urine tests are used to:
- Diagnose a urinary tract infection.
- Check glucose levels. High levels of glucose in your urine may be a sign of gestational diabetes, a type of diabetes that can develop during pregnancy. If your urine glucose was high, your provider may order a blood glucose test to confirm the diagnosis.
- Check protein levels. High levels of protein in your urine can be a sign of several health conditions, including kidney disease, infection, or stress. If your urine protein level was high, your provider will probably order more tests.
1. Prenatal Panel: MedlinePlus Medical Test [accessed on Sep 26, 2021]
2. Routine blood tests during the first trimester of pregnancy | BabyCenter [accessed on Jan 23, 2019]
3. First trimester tests during pregnancy. WebMD [accessed on Jan 23, 2019]
4. Rutuja Chitnis. 16 Important First Trimester Blood Tests You Should Be Aware Off. FirstCry Parenting. Feb 18, 2021 [accessed on Jan 23, 2019]
5. Healthdirect Australia. Blood tests during pregnancy â rhesus, anaemia, blood group | Pregnancy Birth and Baby. Healthdirect Australia. Sep 30, 2024 [accessed on Jan 23, 2019]

Additional Materials (4)

Pregnancy

Haggstrom, Mikael \"Medical gallery of Mikael Haggstrom 2014\" Wikiversity Journal of Medicine

Sensitive content

This media may include sensitive content

Maternal physiological changes in pregnancy

Ernst Bumm and Albrecht Mayer

Weight Gain During Pregnancy

National Institute for Occupational Safety and Health (NIOSH)

Pregnancy

Blausen.com staff (2014). \"Medical gallery of Blausen Medical 2014\". WikiJournal of Medicine 1 (2). DOI:10.15347/wjm/2014.010. ISSN 2002-4436

Pregnancy Test

Pregnancy Test

Also called: Human Chorionic Gonadotropin Test, HCG Test, HCG total OB, HCG (Blood), HCG (Urine)

A pregnancy test can tell whether you're pregnant by checking a urine or blood sample for hCG, a hormone made during pregnancy. HCG levels can first be detected by a blood test about 11 days after conception and about 14 days after conception by a urine test.

Pregnancy Test

Also called: Human Chorionic Gonadotropin Test, HCG Test, HCG total OB, HCG (Blood), HCG (Urine)

A pregnancy test can tell whether you're pregnant by checking a urine or blood sample for hCG, a hormone made during pregnancy. HCG levels can first be detected by a blood test about 11 days after conception and about 14 days after conception by a urine test.

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Use the slider below to see how your results affect your health.
(mi.U.)/mL
5
25
Your result is Negative.
Normal levels of the hCG hormone in women who are not pregnant.
Related conditions
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Use the slider below to see how your results affect your health.
Your result is Negative.
A negative result rules out pregnancy.
Related conditions
You may need this test if you think you're pregnant. Symptoms of pregnancy vary from person to person. The most common sign of early pregnancy is a missed period. Other common signs of early pregnancy may include:
- Swollen, tender breasts
- Fatigue
- Frequent need to urinate (pee)
- Nausea and vomiting (also called morning sickness)
- Feeling bloated or swollen in your abdomen (belly) or body
If you need to have medical treatment that could harm an unborn baby, you may also need a pregnancy test to make sure that you aren't pregnant.
Home pregnancy tests are quick and easy to use. You can buy a home pregnancy test kit without a prescription. The kits include test sticks or strips that react to hCG in your urine. The steps for doing a test depend on the brand, so it's very important to follow the instructions that come with your test. For most test kits, you'll either:
- Hold the test stick or strip in your urine stream
- Collect your urine in a cup and dip the test stick or strip into the cup
After waiting a certain number of minutes, you'll check your results on the test stick or strip. The instructions will tell you what to look for. In general, to get the most accurate results with any home pregnancy test, you'll need to:
- Check the expiration date before you use the test.
- Test your first morning urine. Morning urine usually has more hCG than urine later in the day.
- Use a timer. If you guess the timing, your results may not be accurate.
Blood tests are done at your provider's office or a lab. A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This process usually takes less than five minutes.
Most pregnancy tests simply measure whether or not you have hCG in your sample. But certain pregnancy tests also measure how much hCG you have. These tests are called quantitative hCG tests, and they're usually done on blood samples.
The amount of hCG in your body can give your provider important information about your pregnancy and the health of your unborn baby. Quantitative hCG tests are sometimes used to help:
- Find out the age of the fetus if you're very early in your pregnancy
- Monitor your pregnancy if you have a high risk of miscarriage
- Check for certain problems, such as:
  Ectopic pregnancy, which is a fertilized egg that tries to grow outside of the uterus. The egg cannot grow into a baby when it's in the wrong place. It must be removed to avoid damage to your organs. This can be a medical emergency.
  Molar pregnancy (hydatidiform mole), which is an abnormal growth of tissue in the uterus. It's caused by a fertilized egg with such severe genetic problems that it cannot become a baby. The growth can turn into cancer and must be removed.
  Problems in the unborn baby, including Down syndrome, other chromosome problems, and certain birth defects (hCG testing is usually part of a group of prenatal screening tests called a "triple" or "quadruple" screen test.)
Your provider may also order a quantitative hCG blood test to help diagnose or monitor health conditions that aren't related to pregnancy. These include ovarian and testicular cancer along with other conditions that can increase hCG levels.
1. Pregnancy Test: MedlinePlus Medical Test [accessed on Feb 29, 2024]
2. Quest Diagnostics: hCG, Total, Quantitative [accessed on Sep 12, 2018]
3. Possible Meanings of a High hCG Level in Pregnancy [accessed on Sep 12, 2018]
4. American Pregnancy: Human Chorionic Gonadotropin (hCG): The Pregnancy Hormone [accessed on Sep 12, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (41)

hCG testing for pregnancy

Diagram of typical immunoassay home pregnancy test which detects human chorionic gonadotropin (hCG). (A) A urine sample is applied to the stick. If pregnant, this should contain hCG. (B) As the sample is absorbed into the stick it goes through free dye-labeled antibodies that recognize and stick to hCG. (C) An anchored set of antibodies stick to and capture hCG molecules (and the attached dye-labeled antibodies), creating the first line. In the "not pregnant" sample no hCG is attached to the dye-labeled antibodies, so they wash past this point and no line appears. (D) A second anchored set of antibodies captures the dye-labeled antibodies, providing a positive control to indicate that the test is working properly.

Image by Madprime

Human Chorionic Gonadotropin (hCG): hCG Levels Increase Over Time

hCG testing for pregnancy is available to women of child-bearing age. The \"quad\" screen, of which hCG is a component, is especially recommended for women with higher-risk pregnancies as indicated by factors such as maternal age, family history, and disease history. Levels can first be detected by a blood test about 11 days after conception and about 12-14 days after conception by a urine test. In general the hCG levels will double every 72 hours. The level will reach its peak in the first 8-11 weeks of pregnancy and then will decline and level off for the remainder of the pregnancy.

Image by TheVisualMD

PAPP-A: PAPP-A Screening Tests

The PAPP-A screen is administered as a first-trimester screen integrated with an hCG test and nuchal translucency (NT) ultrasound. The test screens for chromosomal abnormalities such as Down syndrome and trisomy 18. The image featured here shows an ultrasound image of a fetus suspected to have down syndrome. The areas of concern are highlighted in yellow.

Image by TheVisualMD

Human Chorionic Gonadotropin (hCG)

In the very earliest stages of pregnancy, a developing placenta begins to secrete human chorionic gonadotropin (hCG). The hormone enters maternal circulation once an embryo is implanted in the endometrium, shown in this image. hCG testing is used widely to detect pregnancy. Because hCG levels begin to rise immediately after conception, the test enables accurate, early detection.

Image by TheVisualMD

Hormonal Regulation of Growth

Image by OpenStax College

How do pregnancy tests work? - Tien Nguyen

Video by TED-Ed/YouTube

How Pregnancy Tests Work (Pregnancy Health Guru)

Video by Healthguru/YouTube

How to Take a Clear Blue Pregnancy Test | Parents

Video by Parents/YouTube

How Accurate are Pregnancy Tests? | Pregnancy Questions | Parents

Video by Parents/YouTube

Focus on Health: Quad Screen

Video by Virginia Women's Center/YouTube

Graph of the levels of estrogen, progesterone, beta-hcg throughout pregnancy

Graph of the levels of estrogen, progesterone, beta-hcg throughout pregnancy

Image by osmosis

Fallopian Tube and Ovary - Upon fertilization, the egg secretes a hormone called human chorionic gonadotropin (HCG) which signals the corpus luteum to continue progesterone secretion, thereby maintaining the thick uterine lining of the womb.

Fallopian Tube and Ovary: Medical visualization of a cross-section of the ovary, as well as the associated fallopian tube; seen inside the cross-section are a developing follicle, corpus luteum, and corpus albicans. The ovaries are the site of egg production and maturation within the human female. Each month, an oocyte is ejected from a mature follicle to the surface of one of the two ovaries. This event is called ovulation. The finger-like projections of the fallopian tube (fimbriae) sweep up the oocyte into the duct where it awaits fertilization. The remains of the ruptured follicle in the ovary are transformed into a structure called the corpus luteum. Upon fertilization, the egg secretes a hormone called human chorionic gonadotropin (HCG) which signals the corpus luteum to continue progesterone secretion, thereby maintaining the thick uterine lining of the womb. If fertilization does not occur, the corpus luteum degenerates into a corpus albicans, which is essentially scar tissue and is mostly comprised of collagen.

Image by TheVisualMD

Sensitive content

This media may include sensitive content

Ooctye Erupting from Ovary

Visualization of an oocyte erupting from the surface of the ovary. The ovary, which is suspended by the ovarian ligament, is seen in cross section. Revealed are the ovarian follicles which are oocytes in various stages of maturation. Each month, one of the mature follicles ejects it's oocyte through the surface of the ovary. This event is called ovulation. The finger-like projections of the fallopian tube sweep up the oocyte into the duct where it awaits fertilization. Meanwhile, the remains of the ruptured follicle in the ovary are transformed into a structure called the corpus luteum which eventually degenerates if fertilization does not occur. If fertilized, however, the egg secretes the a hormone called human chorionic gonadotropin (HCG) which signals the corpus luteum to continue progesterone secretion, thereby maintaining the thick uterine lining of the womb.

Image by TheVisualMD

Pregnancy-associated plasma protein A

PAPP-A Screening Tests : The PAPP-A screen is administered as a first-trimester screen integrated with an hCG test and nuchal translucency (NT) ultrasound. The test screens for chromosomal abnormalities such as Down syndrome and trisomy 18. The image featured here shows an ultrasound image of a fetus suspected to have down syndrome. The areas of concern are highlighted in yellow.

Image by TheVisualMD

Tubal Pregnancy with Human Embryo (7th week of pregnancy)

This photo of an opened oviduct with an ectopic pregnancy features a spectacularly well preserved 10-millimeter embryo. It is uncommon to see any embryo at all in an ectopic, and for one to be this well preserved (and undisturbed by the prosector's knife) is quite unusual. Even an embryo this tiny shows very distinct anatomic features, including tail, limb buds, heart (which actually protrudes from the chest), eye cups, cornea/lens, brain, and prominent segmentation into somites. The gestational sac is surrounded by a myriad of chorionic villi resembling elongate party balloons. This embryo is about five weeks old (or seven weeks in the biologically misleading but eminently practical dating system used in obstetrics).

Image by Ed Uthman/Flickr

Ectopic pregnancy

Schematic drawing of various types of ectopic pregnancy. N=normal nidation a=peritoneal (abdominal) pregnancy b=cornual pregnancy c=isthmic tubal pregnancy d=ampullar tubal pregnancy e=fimbric tubal pregnancy f=ovarial pregnancy g=cervical pregnancy h=intramural pregnancy

Image by Hic et nunc

Ectopic pregnancy

Transvaginal ultrasonography of an ectopic pregnancy, showing the field of view in the following image.

Image by Mikael Haggstrom, from original by BruceBlaus

Pre-Embryonic Cleavages

Pre-embryonic cleavages make use of the abundant cytoplasm of the conceptus as the cells rapidly divide without changing the total volume.

Image by CNX Openstax

Pre-Embryonic Development

Ovulation, fertilization, pre-embryonic development, and implantation occur at specific locations within the female reproductive system in a time span of approximately 1 week.

Image by CNX Openstax

Development of the Embryonic Disc

Formation of the embryonic disc leaves spaces on either side that develop into the amniotic cavity and the yolk sac.

Image by CNX Openstax

Germ Layers

Formation of the three primary germ layers occurs during the first 2 weeks of development. The embryo at this stage is only a few millimeters in length.

Image by CNX Openstax

Fates of Germ Layers in Embryo

Following gastrulation of the embryo in the third week, embryonic cells of the ectoderm, mesoderm, and endoderm begin to migrate and differentiate into the cell lineages that will give rise to mature organs and organ systems in the infant.

Image by CNX Openstax

Cross-Section of the Placenta

In the placenta, maternal and fetal blood components are conducted through the surface of the chorionic villi, but maternal and fetal bloodstreams never mix directly.

Image by CNX Openstax

Newborn

A single fertilized egg develops over the span of nine months into an infant consisting of trillions of cells and capable of surviving outside the womb. (credit: “Seattleye”/flickr.com)

Image by CNX Openstax (credit: “Seattleye”/flickr.com)

Placenta Previa

An embryo that implants too close to the opening of the cervix can lead to placenta previa, a condition in which the placenta partially or completely covers the cervix.

Image by CNX Openstax

Fallopian Tube and Ovary

Medical visualization of a cross-section of the ovary, as well as the associated fallopian tube; seen inside the cross-section are a developing follicle, corpus luteum, and corpus albicans. The ovaries are the site of egg production and maturation within the human female. Each month, an oocyte is ejected from a mature follicle to the surface of one of the two ovaries. This event is called ovulation. The finger-like projections of the fallopian tube (fimbriae) sweep up the oocyte into the duct where it awaits fertilization. The remains of the ruptured follicle in the ovary are transformed into a structure called the corpus luteum. Upon fertilization, the egg secretes a hormone called human chorionic gonadotropin (HCG) which signals the corpus luteum to continue progesterone secretion, thereby maintaining the thick uterine lining of the womb. If fertilization does not occur, the corpus luteum degenerates into a corpus albicans, which is essentially scar tissue and is mostly comprised of collagen.

Image by TheVisualMD

Choragon (HCG) 5000 IUs

Image by Ferring Pharmaceuticals Inc.

Prepregnancy - Stages of Pregnancy Uterus, amniotic sac and Fetal Growth 1

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Prepregnancy / 12 Weeks / 16 Weeks / 24 Weeks / 40 Weeks

Prepregnancy - Stages of Pregnancy _ Uterus, amniotic sac and Fetal Growth 12 Weeks Stages of Pregnancy _ Uterus, amniotic sac and Fetal Growth_2 16 Weeks Stages of Pregnancy _ Uterus, amniotic sac and Fetal Growth_3 24 Weeks Stages of Pregnancy _ Uterus, amniotic sac and Fetal Growth_4 40 Weeks Stages of Pregnancy _ Uterus, amniotic sac and Fetal Growth_5

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How To Inject Low-Dose hCG | Fertility Treatment | CVS Specialty®

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How To Inject Pregnyl® (hCG) Subcutaneously | Fertility Treatment | CVS Specialty®

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What level of blood Beta HCG confirms pregnancy? - Dr. Phani Madhuri

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I've had positive, faint positive, and negative pregnancy tests. Do HCG levels fluctuate?

Video by IntermountainMoms/YouTube

hCG in Early Pregnancy, Explained - How Much Is Normal? - Pregnancy Q&A

Video by What To Expect/YouTube

Embryo and Fetus Development

Embryo and Fetus Development, placenta and amniotic sac

Image by TheVisualMD

Embryos at 4 to 8 Weeks

Rapid differentiation of cells and an astounding rate of growth characterize the first weeks of embryonic development. At 4 weeks, the embryo is the size of a grain of rice. Its heart has already begun to beat, and the early divisions of what will be the heart's four chambers are apparent. At 6 weeks, the embryo may be half an inch (10-14 mm) long and is starting to acquire a human face, although it is impossible to differentiate male from female embryos at this stage. An 8-week-old embryo may measure over an inch (28-30 mm) in length, and all of the body's parts-cells, tissues, organs, systems-have been differentiated.

Image by TheVisualMD

Embryo at 6 Weeks

At 6 weeks, the embryo is only about half an inch (10-14 mm) long and weighs less than a paper clip. It's possible to see the tiny embryonic heart beating. The embryo is starting to acquire a human face. The folds of the eyelids and the jaws form, and the tip of the nose can be clearly seen. Ears are developing inside and out: internally, the semicircular canals are laid down, while externally mounds of tissue erupt where the whorls of the ears will grow. The eyes become pigmented and continue their extremely complex development, as delicate eye muscles begin to form and nerve cells appear in the retina. At this point male and female fetuses look identical both internally and externally. External genital development consists of an indifferent penis, which will either form into a penis and scrotum or clitoris and labia.

Image by TheVisualMD

Positive Pregnancy Test Result

The urine is placed on the tip of the pregnancy test where it will travel up to the test region. The HCG hormone first binds to, cultured and placed, anti-HCG monoclonal antibodies with attached enzymes that will trigger a color change. Then the bonded HCG and anti-HCG antibodies will encounter another set of monoclonal anti-HCG antibodies and bind. This will cause the first color change of the test that will indicate the user is pregnant. Finally, any remaining anti-HCG monoclonal antibodies will bind to monoclonal HCG antibodies and trigger the second color change. This second color change is the control test that indicates the pregnancy test is working correctly.

Image by Melo20179

HCG and Pregnancy

HCG and Pregnancy

Image by TheVisualMD

Pregnant Woman with Fetus after Conception 0 Months three quarter view

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Pregnant Woman with Fetus - 0 Months, 3 Month, 4 Month 5 Month, 9 Month

0 Months three quarter view 3 Month Pregnant Woman with Fetus 4 Month Pregnant Woman with Fetus 5 Month Pregnant Woman with Fetus 9 Month Pregnant Woman with Fetus

Interactive by TheVisualMD

hCG testing for pregnancy

Madprime

Human Chorionic Gonadotropin (hCG): hCG Levels Increase Over Time

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PAPP-A: PAPP-A Screening Tests

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Human Chorionic Gonadotropin (hCG)

TheVisualMD

Hormonal Regulation of Growth

OpenStax College

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How do pregnancy tests work? - Tien Nguyen

TED-Ed/YouTube

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How Accurate are Pregnancy Tests? | Pregnancy Questions | Parents

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Focus on Health: Quad Screen

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Graph of the levels of estrogen, progesterone, beta-hcg throughout pregnancy

osmosis

Fallopian Tube and Ovary - Upon fertilization, the egg secretes a hormone called human chorionic gonadotropin (HCG) which signals the corpus luteum to continue progesterone secretion, thereby maintaining the thick uterine lining of the womb.

TheVisualMD

Sensitive content

This media may include sensitive content

Ooctye Erupting from Ovary

TheVisualMD

Pregnancy-associated plasma protein A

TheVisualMD

Tubal Pregnancy with Human Embryo (7th week of pregnancy)

Ed Uthman/Flickr

Ectopic pregnancy

Hic et nunc

Ectopic pregnancy

Mikael Haggstrom, from original by BruceBlaus

Pre-Embryonic Cleavages

CNX Openstax

Pre-Embryonic Development

CNX Openstax

Development of the Embryonic Disc

CNX Openstax

Germ Layers

CNX Openstax

Fates of Germ Layers in Embryo

CNX Openstax

Cross-Section of the Placenta

CNX Openstax

Newborn

CNX Openstax (credit: “Seattleye”/flickr.com)

Placenta Previa

CNX Openstax

Fallopian Tube and Ovary

TheVisualMD

Choragon (HCG) 5000 IUs

Ferring Pharmaceuticals Inc.

Prepregnancy / 12 Weeks / 16 Weeks / 24 Weeks / 40 Weeks

TheVisualMD

5:46

How To Inject Low-Dose hCG | Fertility Treatment | CVS Specialty®

CVS Health/YouTube

6:06

How To Inject Pregnyl® (hCG) Subcutaneously | Fertility Treatment | CVS Specialty®

CVS Health/YouTube

6:22

How To Inject Pregnyl® (hCG) Intramuscularly | Fertility Treatment | CVS Specialty®

CVS Health/YouTube

1:40

How high should my HCG levels be at the beginning of pregnancy?

IntermountainMoms/YouTube

3:54

What level of blood Beta HCG confirms pregnancy? - Dr. Phani Madhuri

Doctors' Circle - World's Largest Health Platform/YouTube

4:07

I've had positive, faint positive, and negative pregnancy tests. Do HCG levels fluctuate?

IntermountainMoms/YouTube

1:27

hCG in Early Pregnancy, Explained - How Much Is Normal? - Pregnancy Q&A

What To Expect/YouTube

Embryo and Fetus Development

TheVisualMD

Embryos at 4 to 8 Weeks

TheVisualMD

Embryo at 6 Weeks

TheVisualMD

Positive Pregnancy Test Result

Melo20179

HCG and Pregnancy

TheVisualMD

Pregnant Woman with Fetus - 0 Months, 3 Month, 4 Month 5 Month, 9 Month

TheVisualMD

Blood Typing Test

Blood Typing Test

Also called: ABO Group and Rh Type, Blood type, Blood Typing

A blood typing test is used to determine what type of blood you have according to what antigens you have on the surface of your red blood cells, and whether or not you have a protein called Rh factor. These variables give a total of 8 types of blood types. Usually, this test is done before a blood transfusion, or during a woman's pregnancy.

Blood Typing Test

Also called: ABO Group and Rh Type, Blood type, Blood Typing

A blood typing test is used to determine what type of blood you have according to what antigens you have on the surface of your red blood cells, and whether or not you have a protein called Rh factor. These variables give a total of 8 types of blood types. Usually, this test is done before a blood transfusion, or during a woman's pregnancy.

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Use the slider below to see how your results affect your health.
Your result is O positive.
O positive is the most common blood type (38% of the population). An individual with an O blood group can receive blood only from a group O individual, but can donate blood to individuals of any ABO blood group (A, B, O or AB). Rh-positive people can receive either Rh-positive blood or Rh-negative blood.
Related conditions
This test has 2 steps; first it will determine the type of blood according to the ABO typing and secondly, it will determine whether the red blood cells have the antigen Rh attached to its surface or not.
There are four types of blood according to the ABO typing system:
- Type A
- Type B
- Type AB
- Type O (or zero blood group in some countries)
The Rh typing is the second step to the blood typing. After determining your blood group, a test is performed to see whether your red blood cells have the Rh antigen attached to their surface or not.
Rh+ (positive) means that the red blood cells have this antigen attached on its surface.
Rh- (negative) means that the red blood cells do not have this antigen attached on its surface.

Depending on your blood type you can know what type of blood you can receive in a transfusion.

People	Compatible Red Blood Cells	Compatible Plasma
A	Receive from A and O	Receive from A and AB
B	Receive from B and O	Receive from B and AB
AB	Receive from A, B, AB, O (universal recipient)	Receive from AB
O	Receive from O only	Receive from O, A, B, AB

Rh compatibility only applies to red blood cells and platelets.

Rh+	You can receive from Rh+/-
Rh-	You can receive from Rh - only

1. Blood typing: MedlinePlus Medical Encyclopedia [accessed on Aug 12, 2018]
2. Quraishy N, Sapatnekar S. Advances in Blood Typing. Adv Clin Chem. 2016;77:221-269. doi: 10.1016/bs.acc.2016.06.006. Epub 2016 Jul 25. PMID: 27717418. [accessed on Aug 12, 2018]
3. Blood Typing | Lab Tests Online [accessed on Aug 12, 2018]
4. Blood Types Explained - A, B, AB and O | Red Cross Blood Services [accessed on Aug 12, 2018]
5. Quest Diagnostics: ABO Group and Rh Type [accessed on Aug 12, 2018]
6. LOINC 882-1 — ABO and Rh group [Type] in Blood [accessed on Aug 12, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (16)

In the ABO blood group system, a person with Type A blood displays A-antigens and may have a genotype IAIA or IAi.

In the ABO blood group system, a person with Type A blood displays A-antigens and may have a genotype IAIA or IAi. A person with Type B blood displays B-antigens and may have the genotype IBIB or IBi. A person with Type AB blood displays both A- and B-antigens and has the genotype IAIB and a person with Type O blood, displaying neither antigen, has the genotype ii.

Image by OpenStax College

What are Blood Types?

Video by SciShow/YouTube

Blood Types: ABO and Rh (with donuts and sprinkles!)

Video by ThePenguinProf/YouTube

Blood Types

Video by Bozeman Science/YouTube

Big Idea: Blood Transfusions

Video by SciShow/YouTube

BLOOD TYPES - ABO and Rh Blood Group Systems

Video by Neural Academy/YouTube

Why do blood types matter? - Natalie S. Hodge

Video by TED-Ed/YouTube

How Blood Type Affects Pregnancy Medical Course

Video by Abihail Abihu/YouTube

Human Blood Types

Video by educreations/YouTube

Red Blood Cells

Digital holographic microscopy (DHM) image of red blood cells.

Image by Egelberg (talk)

Scheme of a blood sample after centrifugation

scheme of a blood sample after centrifugation

Image by KnuteKnudsen (talk)

Blood fractionation

Vial of separated blood. The middle layer is a type of sterile goo which separates the blood from the rest of what's drawn.

Image by Wheeler Cowperthwaite from Reno, USA

Whole Blood

A Red Cross whole blood donation before any separation

Image by Whoisjohngalt

Blood types | Human anatomy and physiology | Health & Medicine | Khan Academy

Video by khanacademymedicine/YouTube

There Are Millions of Blood Types

Video by SciShow/YouTube

How Your Blood Type Protects and Hurts You

Video by SciShow/YouTube

In the ABO blood group system, a person with Type A blood displays A-antigens and may have a genotype IAIA or IAi.

OpenStax College

3:05

What are Blood Types?

SciShow/YouTube

15:29

Blood Types: ABO and Rh (with donuts and sprinkles!)

ThePenguinProf/YouTube

10:46

Blood Types

Bozeman Science/YouTube

4:37

Big Idea: Blood Transfusions

SciShow/YouTube

4:46

BLOOD TYPES - ABO and Rh Blood Group Systems

Neural Academy/YouTube

4:42

Why do blood types matter? - Natalie S. Hodge

TED-Ed/YouTube

2:49

How Blood Type Affects Pregnancy Medical Course

Abihail Abihu/YouTube

19:10

Human Blood Types

educreations/YouTube

Red Blood Cells

Egelberg (talk)

Scheme of a blood sample after centrifugation

KnuteKnudsen (talk)

Blood fractionation

Wheeler Cowperthwaite from Reno, USA

Whole Blood

Whoisjohngalt

8:53

Blood types | Human anatomy and physiology | Health & Medicine | Khan Academy

khanacademymedicine/YouTube

5:44

There Are Millions of Blood Types

SciShow/YouTube

4:58

How Your Blood Type Protects and Hurts You

SciShow/YouTube

Rhesus Factor Test

Rhesus Factor Test

Also called: Rh factors, Rh type, Rh typing

Rhesus factor, also known as Rh factor, is a protein that can be found on the surface of red blood cells. The presence of this protein means that you are Rh+ while its absence indicates you are Rh-. This result serves to detect your blood subtype.

Rhesus Factor Test

Also called: Rh factors, Rh type, Rh typing

Rhesus factor, also known as Rh factor, is a protein that can be found on the surface of red blood cells. The presence of this protein means that you are Rh+ while its absence indicates you are Rh-. This result serves to detect your blood subtype.

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Use the slider below to see how your results affect your health.
Your result is Rh Negative (Rh-).
There is no right or wrong result as being positive or negative will not affect your health. However, if you are a pregnant woman, having an Rh- blood type can affect your pregnancy if your baby happens to be Rh+.
Related conditions
Rh incompatibility during pregnancy
An Rh factor test is needed in certain circumstances, such as:
- During a pregnant woman’s first prenatal visit, to determine the risk of Rh factor incompatibility between mother and baby.
- Before receiving a blood transfusion or organ transplant, to adequately select compatible blood products.
- When you donate blood, an organ, or bone marrow for transplantation.
1. https://www.mayoclinic.org/tests-procedures/rh-factor/about/pac-20394960?p=1 [accessed on Jan 21, 2019]
2. https://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/113490 [accessed on Jan 21, 2019]
3. https://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/113498 [accessed on Jan 21, 2019]
4. https://labtestsonline.org/tests/blood-typing [accessed on Jan 21, 2019]
5. https://www.labcorp.com/test-menu/34456/rh-typing [accessed on Jan 21, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (3)

ABO Blood Group

CNX Openstax

8:53

Blood types | Human anatomy and physiology | Health & Medicine | Khan Academy

khanacademymedicine/YouTube

2:21

How Rh factor affects a pregnancy

Toronto Star/YouTube

Red Blood Cell Antibody Screen

Red Blood Cell Antibody Screen

Also called: Indirect Coombs Test, Indirect Antiglobulin Test, IAT, RBC Antibody Screen, Erythrocyte Ab

This test looks for antibodies that target red blood cells in your bloodstream. An RBC antibody screen is used to determine blood compatibility between a pregnant woman and her baby, and for compatibility in blood donations.

Red Blood Cell Antibody Screen

Also called: Indirect Coombs Test, Indirect Antiglobulin Test, IAT, RBC Antibody Screen, Erythrocyte Ab

This test looks for antibodies that target red blood cells in your bloodstream. An RBC antibody screen is used to determine blood compatibility between a pregnant woman and her baby, and for compatibility in blood donations.

{"label":"Red Blood Cell Antibody Screen Reference Range","scale":"lin","step":0.25,"hideunits":true,"items":[{"flag":"negative","label":{"short":"Negative","long":"Negative","orientation":"horizontal"},"values":{"min":0,"max":1},"text":"A negative test result means you do not have antibodies to donor red blood cells, and the blood is not clumping.","conditions":[]},{"flag":"positive","label":{"short":"Positive","long":"Positive","orientation":"horizontal"},"values":{"min":1,"max":2},"text":"A positive test result could mean your blood and the donor's blood are not compatible. A positive test result during pregnancy could mean your baby has hemolytic disease.","conditions":["Donor blood is incompatible with recipient blood","Rh Incompatibility"]}],"value":0.5}[{"negative":0},{"positive":0}]
Use the slider below to see how your results affect your health.
Your result is Negative.
A negative test result means you do not have antibodies to donor red blood cells, and the blood is not clumping.
Related conditions
RBC screen is used to:
- Check your blood before a blood transfusion. The test can show whether your blood is compatible with the donor's blood. If your blood is not compatible, your immune system will attack the transfused blood as if it is a foreign substance. This will be harmful to your health.
- Check your blood during pregnancy. The test can show whether a mother's blood is compatible with the blood of her unborn baby. A mother and her baby may have different types of antigens on their red blood cells. Antigens are substances that produce an immune response. Red blood cell antigens include the Kell antigen and the Rh antigen.
  If you have the Rh antigen, you are considered Rh positive. If you don't have the Rh antigen, you are considered Rh negative.
  If you are Rh negative and your unborn baby is Rh positive, your body may begin to make antibodies against your baby's blood. This condition is called Rh incompatibility.
  Both Kell antigens and Rh incompatibility may cause a mother to make antibodies against her baby's blood. The antibodies can destroy the baby's red blood cells, causing a severe form of anemia. But you can get a treatment that will prevent you from making antibodies that could harm your baby.
- Check the blood of your unborn baby's father.
  If you are Rh negative, your baby's father may be tested to find out his Rh type. If he is Rh positive, your baby will be at risk for Rh incompatibility. Your health care provider will probably perform more tests to find out whether or not there is incompatibility.
If you are getting a blood transfusion: The RBC screen will show whether your blood is compatible with the donor's blood. If it is not compatible, another donor will need to be found.
If you are pregnant: The RBC screen will show whether your blood has any antigens that could harm your baby, including whether or not you have Rh incompatibility.
- If you have Rh incompatibility, your body may begin to make antibodies against your baby's blood.
- These antibodies are not a risk in your first pregnancy, because the baby is usually born before any antibodies are made. But these antibodies could harm your unborn baby in future pregnancies.
- Rh incompatibility can be treated with an injection that prevents your body from making antibodies against your baby's red blood cells.
- If you are Rh positive, there is no risk of Rh incompatibility.
If you have questions about your results, talk to your health care provider.
1. Red Blood Cell Antibody Screen: MedlinePlus Lab Test Information [accessed on Oct 01, 2018]
2. 006015: Antibody Screen | LabCorp [accessed on Oct 01, 2018]
3. Indirect Antiglobulin - Health Encyclopedia - University of Rochester Medical Center [accessed on Oct 01, 2018]
4. Indirect Antiglobulin Blood Test [accessed on Oct 01, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (6)

6:20

Coombs Test Made Simple

MEDSimplified/YouTube

3:05

What are Blood Types?

SciShow/YouTube

Coombs test

A. Rad

In the ABO blood group system, a person with Type A blood displays A-antigens and may have a genotype IAIA or IAi.

OpenStax College

Scheme of a blood sample after centrifugation

KnuteKnudsen (talk)

Blood fractionation

Wheeler Cowperthwaite from Reno, USA

Iron Blood Test

Iron Blood Test

Also called: Iron, Fe Test

Iron is an essential mineral for your organism. An iron deficiency will usually cause anemia, which is a condition where oxygen cannot be properly carried throughout your body. Less frequently, an iron excess can also occur.

Iron Blood Test

Also called: Iron, Fe Test

Iron is an essential mineral for your organism. An iron deficiency will usually cause anemia, which is a condition where oxygen cannot be properly carried throughout your body. Less frequently, an iron excess can also occur.

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Use the slider below to see how your results affect your health.
μg/dL
60
170
Your result is Normal.
Normal values can vary depending on your gender and age.
Related conditions
A test for iron will usually be indicated when results from your routine complete blood count (CBC) test show that you have low hemoglobin levels and that your red blood cells are smaller and paler than normal, this is called microcytic and hypochromic anemia, which is highly suggestive of iron deficiency.
People at high risk of not getting enough iron are:
- Women with heavy periods.
- Pregnant women.
- Young children.
- People with gastrointestinal disorders (because either they do not absorb enough iron, or they excrete it through the feces).
- People with cancer.
Less commonly, this test can also be used to help determine if a person has an iron overload.
Normal values can vary depending on your gender and age, but generally iron can range from 60 to 170 micrograms per deciliter (mcg/dL).
Low iron levels can be the result of:
- Not enough iron intake from your diet
- Heavy menstrual bleeding
- Gastrointestinal disorders that cause impaired iron absorption
- Long-term bleeding, usually from the digestive tract
Heightened iron levels can be the result of:
- Hemochromatosis (a condition in which there is excessive iron in the body)
- Hemolytic anemia (a condition where your red blood cells are destroyed, therefore releasing the iron they carry freely into the bloodstream)
- Having a recent blood transfusion
- Hepatitis (liver inflammation)
- Liver tissue death
- Iron poisoning (more common in children who mistakenly take large quantities of iron tablets thinking they are candies)
You should visit your doctor if you experience:
- Unexplained fatigue
- Pallor
- Heart palpitations
- Chest pain
- Abdominal pain
- Dizziness
- Shortness of breath
- Exercise intolerance
- Weakness
- Headaches
- Black stools
1. https://medlineplus.gov/iron.html [accessed on Jan 31, 2019]
2. https://ods.od.nih.gov/factsheets/Iron-Consumer/ [accessed on Jan 31, 2019]
3. https://medlineplus.gov/ency/article/003488.htm [accessed on Jan 31, 2019]
4. https://labtestsonline.org/tests/iron-tests [accessed on Jan 31, 2019]
5. https://labtestsonline.org/tests/iron [accessed on Jan 31, 2019]
6. https://www.labcorp.com/test-menu/29881/iron# [accessed on Jan 31, 2019]
7. https://www.healthline.com/health/serum-iron#followup [accessed on Jan 31, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (19)

Iron

A metallic element with atomic symbol Fe, atomic number 26, and atomic weight 55.85. It is an essential constituent of HEMOGLOBINS; CYTOCHROMES; and IRON-BINDING PROTEINS. It plays a role in cellular redox reactions and in the transport of OXYGEN.

Image by Alchemist-hp

Iron Physiology

Video by Armando Hasudungan/YouTube

Haemochromatosis - animation

Video by HaemochromatosisAust/YouTube

Iron deficency anemia diagnosis | Hematologic System Diseases | NCLEX-RN | Khan Academy

Video by khanacademymedicine/YouTube

Haemochromatosis Explained

Video by HaemochromatosisAust/YouTube

5 facts about Hemochromatosis

Video by Comprehensive Bleeding Disorders Center/YouTube

Living with and Managing Iron-Deficiency Anemia

Video by NHLBI/YouTube

9 SIGNS OF TOO MUCH IRON // DERMATOLOGIST @DrDrayzday

Video by Dr Dray/YouTube

Iron Overload Educational Videos, Resources Events.flv

Video by pkthalassaemia/YouTube

Iron Nursing Considerations, Normal Range, Nursing Care, Lab Values Nursing

Video by NURSINGcom/YouTube

Iron Deficiency Anemia, Ferritin and Fatigue - Testing and Diagnosis

Video by IBS Treatment Center/YouTube

Iron, Hemochromatosis, Hepatomegaly

Hemochromatosis is a genetic disease that causes the body to absorb too much iron. Because the body can't use or eliminate this extra iron, it's stored in organs, especially the liver, but also the heart and pancreas. Eventually, up to 20 times as much iron as normal can accumulate, which can lead to organ failure. Symptoms can include irregular heartbeat, cirrhosis, chronic fatigue, confusion, and hepatomegaly, the enlargement of the liver.

Image by TheVisualMD

How Is Iron-Deficiency Anemia Diagnosed?

Blood smear of a patient with Iron deficiency anemia at 40x enhancement

Image by Roberto J. Galindo

Iron Deficient Red Blood Cells

Anemia occurs when there are too few red blood cells in the bloodstream to deliver adequate oxygen to body tissues. There are different types and causes of anemia, but iron deficiency is the most common. Different tests can determine the amount of iron in the blood, the capacity of the blood to transport iron, and the amount of iron in storage. Iron is transported throughout the body with the help of proteins. The total iron binding capacity test (TIBC) measures the blood's ability to bind and transport iron

Image by TheVisualMD

Heme Group

Hemoglobin is an iron-containing protein found in red blood cells (RBCs) that enables RBCs to deliver oxygen from the lungs to cells throughout the body and carry carbon dioxide from these cells back to the lungs. It is the iron in hemoglobin that gives blood its red color; a single RBC can contain 250 million hemoglobin molecules. Hemoglobin is one of several tests used to detect anemia.

Image by TheVisualMD

Vitamins, Minerals, & Development

Image by TheVisualMD

Nourishing Baby in the Womb

Image by TheVisualMD

This browser does not support the video element.

Anemia & Chronic Kidney Disease

Explore the inner workings of the body to understand the relationship between chronic kidney disease(CKD) and anemia, a debilitating condition that affects people with CKD. Learn how the kidney is responsible for starting the elaborate process of creating red blood cells and how the delicate balance of these cells affects your vitality.

Video by TheVisualMD

This browser does not support the video element.

Anemia Blood Flow

Shows anemic blood flow through a capillary embedded in tissue (type of tissue/cells? Part of body?)

Video by TheVisualMD

Iron

Alchemist-hp

14:07

Iron Physiology

Armando Hasudungan/YouTube

2:15

Haemochromatosis - animation

HaemochromatosisAust/YouTube

9:54

Iron deficency anemia diagnosis | Hematologic System Diseases | NCLEX-RN | Khan Academy

khanacademymedicine/YouTube

10:00

Haemochromatosis Explained

HaemochromatosisAust/YouTube

2:17

5 facts about Hemochromatosis

Comprehensive Bleeding Disorders Center/YouTube

3:56

Living with and Managing Iron-Deficiency Anemia

NHLBI/YouTube

13:05

9 SIGNS OF TOO MUCH IRON // DERMATOLOGIST @DrDrayzday

Dr Dray/YouTube

2:01

Iron Overload Educational Videos, Resources Events.flv

pkthalassaemia/YouTube

2:39

Iron Nursing Considerations, Normal Range, Nursing Care, Lab Values Nursing

NURSINGcom/YouTube

3:38

Iron Deficiency Anemia, Ferritin and Fatigue - Testing and Diagnosis

IBS Treatment Center/YouTube

Iron, Hemochromatosis, Hepatomegaly

TheVisualMD

How Is Iron-Deficiency Anemia Diagnosed?

Roberto J. Galindo

Iron Deficient Red Blood Cells

TheVisualMD

Heme Group

TheVisualMD

Vitamins, Minerals, & Development

TheVisualMD

Nourishing Baby in the Womb

TheVisualMD

1:54

Anemia & Chronic Kidney Disease

TheVisualMD

0:12

Anemia Blood Flow

TheVisualMD

Hemoglobin A1C (HbA1C) Test

Hemoglobin A1C (HbA1C) Test

Also called: A1C, HbA1c, Hemoglobin A1C, Glycohemoglobin, Glycated Hemoglobin, Glycosylated Hemoglobin

A hemoglobin A1C test is a blood test that measures the amount of glucose (sugar) attached to hemoglobin. An A1C test can show your average glucose level for the past three months. Doctors may use the A1C alone or in combination with other diabetes tests to make a diagnosis. They also use the A1C to see how well you are managing your diabetes.

Hemoglobin A1C (HbA1C) Test

Also called: A1C, HbA1c, Hemoglobin A1C, Glycohemoglobin, Glycated Hemoglobin, Glycosylated Hemoglobin

A hemoglobin A1C test is a blood test that measures the amount of glucose (sugar) attached to hemoglobin. An A1C test can show your average glucose level for the past three months. Doctors may use the A1C alone or in combination with other diabetes tests to make a diagnosis. They also use the A1C to see how well you are managing your diabetes.

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Use the slider below to see how your results affect your health.
% Hb
5.7
6.5
Your result is Normal.
When sugar enters your bloodstream, it attaches to hemoglobin, a protein in your red blood cells. Everybody has some sugar attached to their hemoglobin. A normal A1C level is below 5.7%.
Related conditions
A hemoglobin A1C (HbA1C) test is a blood test that shows what your average blood sugar (glucose) level was over the past two to three months.
Glucose is a type of sugar in your blood that comes from the foods you eat. Your cells use glucose for energy. A hormone called insulin helps glucose get into your cells. If you have diabetes your body doesn't make enough insulin, or your cells don't use it well. As a result, glucose can't get into your cells, so your blood sugar levels increase.
Glucose in your blood sticks to hemoglobin, a protein in your red blood cells. As your blood glucose levels increase, more of your hemoglobin will be coated with glucose. An A1C test measures the percentage of your red blood cells that have glucose-coated hemoglobin.
An A1C test can show your average glucose level for the past three months because:
- Glucose sticks to hemoglobin for as long as the red blood cells are alive.
- Red blood cells live about three months.
High A1C levels are a sign of high blood glucose from diabetes. Diabetes can cause serious health problems, including heart disease, kidney disease, and nerve damage. But with treatment and lifestyle changes, you can control your blood glucose levels.
An A1C test may be used to screen for or diagnose:
- Type 2 diabetes. With type 2 diabetes your blood glucose gets too high because your body doesn't make enough insulin to move blood sugar from your bloodstream into your cells, or because your cells stop responding to insulin.
- Prediabetes. Prediabetes means that your blood glucose levels are higher than normal, but not high enough to diagnosed as diabetes. Lifestyle changes, such as healthy eating and exercise, may help delay or prevent prediabetes from becoming type 2 diabetes.
If you have diabetes or prediabetes, an A1C test can help monitor your condition and check how well you've been able to control your blood sugar levels.
The Centers for Disease Control (CDC) recommends A1C testing for diabetes and prediabetes if:
- You are over age 45.
  If your results are normal, you should repeat the test every 3 years.
  If your results show you have prediabetes, you will usually need to be tested every 1 to 2 years. Ask your provider how often to get tested and what you can do to reduce your risk of developing diabetes.
  If your results show you have diabetes, you should get an A1C test at least twice a year to monitor your condition and treatment.
- You are under 45 and are more likely to develop diabetes because you:
  Have prediabetes.
  Are overweight or have obesity.
  Have a parent or sibling with type 2 diabetes.
  Have high blood pressure or high cholesterol levels.
  Have heart disease or have had a stroke.
  Are physically active less than 3 times a week.
  Have had gestational diabetes (diabetes during pregnancy) or given birth to a baby over 9 pounds.
  Are African American, Hispanic or Latino, American Indian, or an Alaska Native person. Some Pacific Islander and Asian American people also have a higher risk of developing diabetes.
  Have polycystic ovarian syndrome (PCOS).
You may also need an A1C test if you have symptoms of diabetes, such as:
- Feeling very thirsty
- Urinating (peeing) a lot
- Losing weight without trying
- Feeling very hungry
- Blurred vision
- Numb or tingling hands or feet
- Fatigue
- Dry skin
- Sores that heal slowly
- Having more infections than usual
A1C results tell you what percentage of your hemoglobin is coated with glucose. The percent ranges are just a guide to what is normal. What's normal for you depends on your health, age, and other factors. Ask your provider what A1C percentage is healthy for you.
To diagnose diabetes or prediabetes, the percentages commonly used are:
- Normal: A1C below 5.7%
- Prediabetes: A1C between 5.7% and 6.4%
- Diabetes: A1C of 6.5% or higher
Providers often use more than one test to diagnose diabetes. So, if your test result was higher than normal, you may have another A1C test or a different type of diabetes test, usually either a fasting blood glucose test or an oral glucose tolerance test (OGTT).
If your A1C test was done to monitor your diabetes, talk with your provider about what your test results mean.
1. Hemoglobin A1C (HbA1c) Test: MedlinePlus Medical Test [accessed on Oct 05, 2022]
2. https://diabetesed.net/wp-content/uploads/2017/12/2018-ADA-Standards-of-Care.pdf [accessed on Apr 19, 2019]
3. https://labtestsonline.org/tests/hemoglobin-a1c [accessed on Apr 19, 2019]
4. https://www.niddk.nih.gov/health-information/diabetes/overview/tests-diagnosis/a1c-test [accessed on Apr 19, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (23)

Hemoglobin A1C molecule

Hemoglobin is a protein found inside red blood cells that carries oxygen from the lungs to cells throughout the body. Hemoglobin also binds with glucose. Diabetics have too much glucose in the bloodstream and this extra glucose binds (or glycates) with hemoglobin. Glycated hemoglobin usually stays glycated for the life of the red blood cell (about 3 months). Therefore, the percentage of hemoglobin that is glycated (measured as A1C) reflects glucose levels that have affected red blood cells up to 3 months in the past.

Image by TheVisualMD

Hemoglobin A1C: Red Blood Cells

Red blood cells use the iron-rich protein hemoglobin to carry oxygen from the lungs to cells throughout the body and return carbon dioxide to the lungs. The percentage of hemoglobin bound to blood glucose (hemoglobin A1C) is used to diagnose diabetes.

Image by TheVisualMD

Testing and Diagnosing Diabetes

Several tests are used to diagnose prediabetes and diabetes. In June 2009, the ADA, the European Association for the Study of Diabetes, and the International Diabetes Federation made a joint recommendation that type 2 diabetes testing include the glycated hemoglobin (A1C) test. This test measures average blood glucose level during the past 2-3 months by measuring the percentage of glucose attached to hemoglobin, the oxygen-carrying protein pigment in red blood cells.

Image by TheVisualMD

HemoglobinA1C molecule

The A1C test is a common blood test used to diagnose type 1 and type 2 diabetes and then to gauge how well you're managing your diabetes. The A1C test goes by many other names, including glycated hemoglobin, glycosylated hemoglobin, hemoglobin A1C and HbA1c. The A1C test result reflects your average blood sugar level for the past two to three months. Specifically, the A1C test measures what percentage of your hemoglobin, a protein in red blood cells that carries oxygen, is coated with sugar (glycated). The higher your A1C level, the poorer your blood sugar control. And if you have previously diagnosed diabetes, the higher the A1C level, the higher your risk of diabetes complications.

Image by TheVisualMD

α,β-hemoglobin/haptoglobin hexamer complex

A model of α,β-hemoglobin/haptoglobin hexamer complex. There are 2 α,β-hemoglobin dimers depicted: one space filling model (yellow/orange), and one ribbon model (purple/blue). Each is bound by a haptoglobin molecule (both haptoglobin molecules are shown in pink, with one as a space filling model and one as a ribbon model).

Image by Ayacop

Hemoglobin, Carbon Monoxide

Hemoglobin is an iron-containing protein that enables red blood cells to deliver oxygen from the lungs to cells throughout the body. But the same binding site on the hemoglobin molecule has an even stronger affinity for carbon monoxide, which is why we are so susceptible to poisoning by this deadly gas; carbon monoxide grabs all the binding sites and starves the body's tissues of oxygen

Image by TheVisualMD

This browser does not support the video element.

Hemoglobin A1c

The hemoglobin A1c test measures the percentage of hemoglobin bound to blood sugar (glucose); the test is used to diagnose type 1 and type 2 diabetes. Because the test results reflect average blood sugar levels over a period of 2-3 months (rather than daily fluctuations), the hemoglobin A1C test is also used to gauge how well patients are managing their diabetes over time.

Video by TheVisualMD

Understanding Your A1C (Conditions A-Z)

Video by Healthguru/YouTube

Haemoglobin

Video by Wellcome Trust/YouTube

A1c - What You Need To Know

Video by Rehealthify/YouTube

This browser does not support the video element.

Type 2 Diabetes Testing

An estimated 79 million Americans, just over 25 percent of the population aged 20 years or older, have prediabetes. Prediabetes is a state where blood sugars may be a little bit elevated, but are not yet elevated to a dangerous range. It is typically asymptomatic, and if undiagnosed and untreated, prediabetes may lead to a potentially life-threatening condition called type 2 diabetes. Complications of type 2 diabetes include blindness, heart attack, and stroke. Prediabetes is readily detectable through simple blood testing with a goal of detecting abnormal glucose levels. Two common and complementary tests include fasting blood sugar and hemoglobin A1C (HbA1c) tests. With early detection and diagnosis, appropriate and immediate action can be made by the patient to reduce complications and to ensure a long and healthy life.

Video by TheVisualMD

Diagnosis of Type 2 Diabetes

Video by Animated Diabetes Patient/YouTube

Hemoglobin A1c & Diabetes

Video by DiabeTV/YouTube

Diabetic HbA1c - Everything You Need To Know - Dr. Nabil Ebraheim

Video by nabil ebraheim/YouTube

What Is An A1C?

Video by dLife/YouTube

A1C Levels

Video by Khan Academy/YouTube

This browser does not support the video element.

Type 1 Diabetes Diagnosis & Treatment

Type 1 diabetes can be diagnosed with blood tests that measure how much sugar is in your blood. They include: hemoglobin A1C, fasting blood glucose, and oral glucose tolerance. Type 1 diabetes is usually diagnosed in childhood or adolescence. About 5% of adults with diabetes have type 1 diabetes. Early diagnosis is crucial for early treatment. Type 1 diabetics need to take insulin, either through a pump or injections. Regular exercise as well as a diet low in refined carbohydrates will also help control blood sugar levels. By maintaining appropriate blood sugar levels, type 1 diabetics can lead normal lives free of serious complications.

Video by TheVisualMD

The 411 On Your A1c

Video by Lee Health/YouTube

Is Your A1C AOK?

Video by Lee Health/YouTube

What if the root cause of type 2 diabetes is found in the gut rather than the pancreas?

Video by TEDMED/YouTube

Lactate Threshold Test

Video by Mount Sinai Health System/YouTube

How HbA1c testing detects glucose in your body for diabetes type 2

Video by Pathology Tests Explained/YouTube

A Critical Balance

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Diabetes in the US

Interactive by TheVisualMD

Hemoglobin A1C molecule

TheVisualMD

Hemoglobin A1C: Red Blood Cells

TheVisualMD

Testing and Diagnosing Diabetes

TheVisualMD

HemoglobinA1C molecule

TheVisualMD

α,β-hemoglobin/haptoglobin hexamer complex

Ayacop

Hemoglobin, Carbon Monoxide

TheVisualMD

0:27

Hemoglobin A1c

TheVisualMD

1:10

Understanding Your A1C (Conditions A-Z)

Healthguru/YouTube

5:31

Haemoglobin

Wellcome Trust/YouTube

1:28

A1c - What You Need To Know

Rehealthify/YouTube

5:52

Type 2 Diabetes Testing

TheVisualMD

4:31

Diagnosis of Type 2 Diabetes

Animated Diabetes Patient/YouTube

1:43

Hemoglobin A1c & Diabetes

DiabeTV/YouTube

4:41

Diabetic HbA1c - Everything You Need To Know - Dr. Nabil Ebraheim

nabil ebraheim/YouTube

3:03

What Is An A1C?

dLife/YouTube

6:09

A1C Levels

Khan Academy/YouTube

1:12

Type 1 Diabetes Diagnosis & Treatment

TheVisualMD

1:56

The 411 On Your A1c

Lee Health/YouTube

1:41

Is Your A1C AOK?

Lee Health/YouTube

3:21

What if the root cause of type 2 diabetes is found in the gut rather than the pancreas?

TEDMED/YouTube

1:06

Lactate Threshold Test

Mount Sinai Health System/YouTube

2:28

How HbA1c testing detects glucose in your body for diabetes type 2

Pathology Tests Explained/YouTube

Diabetes in the US

TheVisualMD

ToRCH Test

ToRCH Test

Also called: Prenatal Infectious Disease Antibodies

This test is used to determine the infectious status of a person for toxoplasma, rubella virus, cytomegalovirus, and herpes virus (ToRCH). Pregnant women are at high risk of developing fetal malformation when infected by any of these viruses. Screening for these diseases is essential during pregnancy.

ToRCH Test

Also called: Prenatal Infectious Disease Antibodies

This test is used to determine the infectious status of a person for toxoplasma, rubella virus, cytomegalovirus, and herpes virus (ToRCH). Pregnant women are at high risk of developing fetal malformation when infected by any of these viruses. Screening for these diseases is essential during pregnancy.

ToRCH is an acronym for the infections that this test screens for: Toxoplasmosis, Rubella, Cytomegalovirus, and Herpes simplex virus.
- Toxoplasmosis: Caused by a parasite found on cat stools and raw meat. It can get transmitted through infection of contaminated water, soil, and foods. In pregnant women, it passes through the placenta, causing severe neurological damage in the fetus that can result in deafness, blindness, and intellectual disability.
- Rubella: Also known as German measles, it's a virus transmitted through contaminated droplets in the air. Infections can cause generalized rash, fever, and inflammation of the lymph nodes. In pregnant women, Rubella can cause severe damage to the fetal development and risk of miscarriage or premature birth.
- Cytomegalovirus (CMV): This is a virus that usually goes undetected because it generally doesn't cause any symptoms. Some people show fever, malaise, and inflammation of the lymph nodes. It gets spread through sexual contact and body fluids. This virus can be fatal for immunocompromised individuals, such as people with AIDS or cancer; a fetus can develop congenital disabilities if the mother is infected during pregnancy.
- Herpes simplex virus (HSV): HSV has to types; type 1 is associated with oro-labial infections and type 2 with genitourinary infections. HSV in pregnancy increases the risk of miscarriage, premature birth, and impairment of fetal development.
Your doctor may order this test in the following situations:
- As a routine pregnancy test
- When a newborn has a high risk of having been infected
- If a newborn has seizures, heart defects, jaundice, or development delays
1. TRCHG - Clinical: ToRCH Profile IgG, Serum [accessed on Aug 12, 2018]
2. TORCH Panel - Health Encyclopedia - University of Rochester Medical Center [accessed on Aug 12, 2018]
3. TORCH [accessed on Aug 12, 2018]
4. LabCorp: Prenatal Infectious Disease Antibodies, Quantitative, IgM [accessed on Aug 28, 2018]
5. LabCorp: Prenatal Infectious Disease Antibodies, Qualitative, IgG With Reflex to Supplemental HSV-2 Testing [accessed on Aug 28, 2018]

Toxoplasmosis Testing

Toxoplasmosis Testing

Also called: Toxoplasmosis Antibodies, Toxoplasma gondii Ab, T. gondii Ab

Toxoplasma gondii. In healthy people the infection usually passes unnoticed; however, in people with a weakened immune system and pregnant women, it can lead to serious complications.

Toxoplasmosis Testing

Also called: Toxoplasmosis Antibodies, Toxoplasma gondii Ab, T. gondii Ab

Toxoplasma gondii. In healthy people the infection usually passes unnoticed; however, in people with a weakened immune system and pregnant women, it can lead to serious complications.

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Use the slider below to see how your results affect your health.
units/mL
7.2
8.7
Your result is Not detected.
T. gondii. However, negative results may be seen in cases of remote exposure with subsequent loss of detectable antibody.
Related conditions
{"label":"Toxo IgM reference range","description":"This test checks to see if you have antibodies to <em>Toxoplasma gondii<\/em>. IgM is a type of antibody that is first released after you get infected. The presence of IgM antibodies indicate a current or recent infection. Toxoplasma is very dangerous for a pregnant woman and her developing baby.","scale":"lin","step":0.1,"items":[{"flag":"normal","label":{"short":"Negative","long":"Negative","orientation":"horizontal"},"values":{"min":0,"max":8},"text":"This indicates that is unlikely that you have acute toxoplasmosis but it does not completely rule out the infection; therefore, in some cases, the test should be repeated if the suspicion remains.","conditions":[]},{"flag":"borderline","label":{"short":"Equivocal","long":"Equivocal","orientation":"horizontal"},"values":{"min":8,"max":9.9},"text":"This suggests possible early acute infection or a false-positive result. The test should be repeated in a few weeks.","conditions":[]},{"flag":"abnormal","label":{"short":"Positive","long":"Positive","orientation":"horizontal"},"values":{"min":9.9,"max":20},"text":"A positive result indicates an acute infection by T. gondii. False positives\u00a0can occur under certain circumstances. ","conditions":["Acute toxoplasmosis"]}],"hideunits":false,"value":4}[{"normal":0},{"borderline":0},{"abnormal":0}]
Use the slider below to see how your results affect your health.
8
9.9
Your result is Negative.
This indicates that is unlikely that you have acute toxoplasmosis but it does not completely rule out the infection; therefore, in some cases, the test should be repeated if the suspicion remains.
Related conditions
Your doctor may want to order this test to diagnose a current or past toxoplasmosis infection in the following cases:
- In pregnant women
- In individuals with a compromised immune system
- When a person has flu-like symptoms, severe eye problems, or a brain infection that could be due to toxoplasmosis.
You should visit your doctor if you are pregnant and have been exposed to raw meat or cat feces, or if experience signs or symptoms of toxoplasmosis, such as:
- Swollen lymph nodes
- Fever
- Weakness, fatigue
- Persistent headache
- Body aches
- Eye pain
- Visual disturbances
- Behavioral changes
- Confusion
- Seizures
1. URMC / Encyclopedia / Toxoplasma Gondii Antibody [accessed on Aug 27, 2018]
2. Toxoplasmosis Testing [accessed on Aug 27, 2018]
3. CDC - Toxoplasmosis - Disease [accessed on Nov 14, 2018]
4. Toxoplasma blood test: MedlinePlus Medical Encyclopedia [accessed on Nov 14, 2018]
5. https://www.labcorp.com/tests/related-documents/L5828 [accessed on Nov 14, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (30)

Toxoplasmosis - Plain and Simple

Video by Else-Vet/YouTube

Toxoplasmosis and Mind Control - Plain and Simple

Video by Else-Vet/YouTube

Are cats making you crazy? Toxoplasmosis can change you

Video by News Direct/YouTube

Robert Sapolsky Interview: Toxoplasmosis

Video by Christian G/YouTube

Toxoplasmosis - Toxoplasma gondii Infection

Video by How To Gastro/YouTube

How common is toxoplasmosis infection?

Video by International Myeloma Foundation/YouTube

Toxoplasmosis: Truth, Fiction, and Crazy Cat Ladies? - full video - conference recording

Video by Maddie's Fund Education/YouTube

Toxoplasmosis: How Parasites in Your Cat Can Infect Your Brain

Video by SciShow Psych/YouTube

Toxoplasmosis

Video by VetMedAcademy/YouTube

Toxoplasmosis research shows implications of how Zika may pass through blood brain barrier

Video by University of Pennsylvania/YouTube

Brain Parasite Makes Mice Fearless - by Scientific American

Video by Scientific American/YouTube

How the parasite Toxoplasma tricks rats into becoming cat food

Video by News Direct/YouTube

Mind-controlling Parasites!

Video by SciShow/YouTube

Bad Bug Book: Foodborne Pathogenic Microorganisms and Natural Toxins Handbook

The Bad Bug Book 2nd Edition, released in 2012, provides current information about the major known agents that cause foodborne illness.

Document by FDA

Toxoplasmosis life cycle

Toxoplasmosis life cycle: 1.Cat eats prey with toxoplasmosis becoming the primary host of Toxoplasma gondii. 2. Toxoplasma gondii disrupts the wall of the cat’s small intestine, forming oocysts, as well as tissue cysts in the brain and muscles. 3.When the cat excretes waste, the feces is contaminated with the oocysts. 4. The feces contaminates the surrounding plants. 5. Organisms eat the plants consuming the oocysts, and become infected by the parasite. When consumed by another organism, the parasite invades the new host, causing the cycle to begin again.

Image by Ilovericexoxo

Pregnant Women at Risk for Toxoplasma Infection

In this 2005 photograph, a pregnant woman was looking on while her husband was in the process of changing the kitty litter, in order to avoid contact with possible pathogens such as Toxoplasma gondii, the etiologic agent responsible for the disease, toxoplasmosis. Of those who are infected, very few have symptoms because a healthy person's immune system usually keeps the parasite from causing illness. However, pregnant women, and individuals who have compromised immune systems should be cautious; for them, a Toxoplasma infection could cause serious health problems.

Image by CDC; Photo credit: James Gathany

Maternal Age

The pregnant woman depicted in this 2005 image, was about to pet her cat, while her husband was in the process of changing the cat’s litter, in order for the woman to avoid contact with possible pathogens such as Toxoplasma gondii, the etiologic agent responsible for the disease, toxoplasmosis. Of those who are infected, very few have symptoms because a healthy person's immune system usually keeps the parasite from causing illness. However, pregnant women and individuals who have compromised immune systems should be cautious; for them, a Toxoplasma infection could cause serious health problems.

Image by CDC; Photo credit: James Gathany

Food Contamination

This photograph depicted a pregnant woman in the process of peeling an apple using a peeling implement after having washed a batch of apples in the kitchen sink. In order to avoid acquiring possible foodborne illness from eating a peeled food, one should wash such a food in warm soapy water prior to peeling, which will greatly reduce the chances of introducing a foodborne pathogen to the fruit's clean interior.

Image by CDC; Photo credit: James Gathany

Toxoplasmosis from food

Toxoplasmosis from food

Image by CDC

Illustration of the life cycle of Toxoplasma gondii, the causal agent of Toxoplasmosis

This is an illustration of the life cycle of Toxoplasma gondii, the causal agent of Toxoplasmosis.

Image by CDC/Alexander J. da Silva, PhD/Melanie Moser ID 3421

Food Contamination

This 2005 photograph showed a pregnant woman using a kitchen knife to cut raw meat before cooking. Pregnant women, or immunosuppressed patients can be at greater risk in acquiring foodborne illnesses, and need to take additional precautions when handling raw food products.

Image by CDC; Photo credit: James Gathany

Cats are a potential carrier of Toxoplasmosis

Cats are a potential carrier of Toxoplasmosis

Image by wilkernet

Indoor cat

Image by Anete Lūsiņa / Unsplash

Sensitive content

This media may include sensitive content

Schistosome Parasite

Scanning electron micrograph of a schistosome parasite, which enters the body through the skin of persons coming in contact with infested waters. The adult worm lives in the veins of its host. This parasite has been associated with some cancers. The parasite is magnified x256 in this photograph.

Image by National Cancer Institute / Bruce Wetzel and Harry Schaefer (Photographers)

Brain tissue with neurotoxoplasmosis

This photomicrograph of a brain tissue sample reveals some of the cytoarchitectural details associated with a case of neurotoxoplasmosis. The cause of this illness is the parasite, Toxoplasma gondii, and some cystic-stage T. gondii organisms are visible in the field of view. (This image was provided by Jonathan W.M. Gold. M.D., Assoc. Dir. Special Microbiology Lab, Assist. Attending Physician, Memorial Sloan-Kettering Cancer Center and Asssit. Prof. of Medicine, Cornell Univ. Med. College, New York.)

Image by CDC/ Jonathan W.M. Gold, M.D.

Maternal Age

This photograph showed a pregnant woman feeding her cat canned cat food, in order to prevent it from becoming infected with the parasite, Toxoplasma gondii. An infected cat can cause harm to individuals with a weakened immune system, and a pregnant woman’s unborn child. Though feeding her cat canned food is a good practice, the cat should also be kept off of any countertops on which food preparation could take place, such as in a kitchen setting.

Image by CDC; Photo credit: James Gathany

Toxoplasma LifeCycle CDC

toxoplasma gondii life cycle CDC

Image by CDC/Wikimedia

Adult Chrysomya megacephala blowfly, known as bazaar fly, feeding by sponging at organic waste from where it may transmit harmful bacteria

Adult Chrysomya megacephala blowfly, known as bazaar fly, feeding by sponging at organic waste from where it may transmit harmful bacteria

Image by Muhammad Mahdi Karim

Foodborne illness symptoms

If you have been experiencing these symptoms for longer than 24 hours please seek medical attention immediately.

Image by USDA

Catch up on checkups and routine vaccines

As opportunities for in-person learning and play grow, it’s important for your child to catch up on checkups and recommended vaccines to protect their health now and in the future.

Document by CDC

12:42

Toxoplasmosis - Plain and Simple

Else-Vet/YouTube

11:03

Toxoplasmosis and Mind Control - Plain and Simple

Else-Vet/YouTube

0:35

Are cats making you crazy? Toxoplasmosis can change you

News Direct/YouTube

24:27

Robert Sapolsky Interview: Toxoplasmosis

Christian G/YouTube

7:18

Toxoplasmosis - Toxoplasma gondii Infection

How To Gastro/YouTube

4:36

How common is toxoplasmosis infection?

International Myeloma Foundation/YouTube

57:18

Toxoplasmosis: Truth, Fiction, and Crazy Cat Ladies? - full video - conference recording

Maddie's Fund Education/YouTube

5:28

Toxoplasmosis: How Parasites in Your Cat Can Infect Your Brain

SciShow Psych/YouTube

9:02

Toxoplasmosis

VetMedAcademy/YouTube

2:21

Toxoplasmosis research shows implications of how Zika may pass through blood brain barrier

University of Pennsylvania/YouTube

1:26

Brain Parasite Makes Mice Fearless - by Scientific American

Scientific American/YouTube

0:37

How the parasite Toxoplasma tricks rats into becoming cat food

News Direct/YouTube

4:23

Mind-controlling Parasites!

SciShow/YouTube

Bad Bug Book: Foodborne Pathogenic Microorganisms and Natural Toxins Handbook

FDA

Toxoplasmosis life cycle

Ilovericexoxo

Pregnant Women at Risk for Toxoplasma Infection

CDC; Photo credit: James Gathany

Maternal Age

CDC; Photo credit: James Gathany

Food Contamination

CDC; Photo credit: James Gathany

Toxoplasmosis from food

CDC

Illustration of the life cycle of Toxoplasma gondii, the causal agent of Toxoplasmosis

CDC/Alexander J. da Silva, PhD/Melanie Moser ID 3421

Food Contamination

CDC; Photo credit: James Gathany

Cats are a potential carrier of Toxoplasmosis

wilkernet

Indoor cat

Anete Lūsiņa / Unsplash

Sensitive content

This media may include sensitive content

Schistosome Parasite

National Cancer Institute / Bruce Wetzel and Harry Schaefer (Photographers)

Brain tissue with neurotoxoplasmosis

CDC/ Jonathan W.M. Gold, M.D.

Maternal Age

CDC; Photo credit: James Gathany

Toxoplasma LifeCycle CDC

CDC/Wikimedia

Adult Chrysomya megacephala blowfly, known as bazaar fly, feeding by sponging at organic waste from where it may transmit harmful bacteria

Muhammad Mahdi Karim

Foodborne illness symptoms

USDA

Catch up on checkups and routine vaccines

CDC

Cytomegalovirus (CMV) Tests

Cytomegalovirus (CMV) Tests

Also called: CMV Tests, CMV IgG and IgM, Cytomegalovirus Antibody, Cytomegalovirus Serology, Cytomegalovirus IgG Antibody, Cytomegalovirus IgM Antibody

Cytomegalovirus (CMV) is a common type of virus. CMV tests look for signs of the virus in blood, sputum, or other body fluids. CMV doesn't cause health problems for most people. But it can be dangerous to newborns and people with immune system disorders.

Cytomegalovirus (CMV) Tests

Also called: CMV Tests, CMV IgG and IgM, Cytomegalovirus Antibody, Cytomegalovirus Serology, Cytomegalovirus IgG Antibody, Cytomegalovirus IgM Antibody

Cytomegalovirus (CMV) is a common type of virus. CMV tests look for signs of the virus in blood, sputum, or other body fluids. CMV doesn't cause health problems for most people. But it can be dangerous to newborns and people with immune system disorders.

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Use the slider below to see how your results affect your health.
units/mL
0.6
0.7
Your result is Not detected.
A negative or not detected result indicates that you have never been exposed to the virus.
Related conditions
{"label":"Cytomegalovirus IgM antibody reference range","description":"This test checks to see if you have antibodies to cytomegalovirus (CMV). IgM is a type of antibody that is first released after you get infected. The presence of IgM antibodies indicate a current or recent infection.","scale":"lin","step":0.1,"items":[{"flag":"normal","label":{"short":"Not detected","long":"Not detected","orientation":"horizontal"},"values":{"min":0,"max":30},"text":"A negative or not detected result indicates that you are not experiencing a recent infection; however, it does not rule out a past infection.","conditions":[]},{"flag":"borderline","label":{"short":"Indeterminate","long":"Indeterminate","orientation":"horizontal"},"values":{"min":30,"max":35},"text":"An equivocal or indeterminate result may occur during acute infection; nevertheless, in some cases, the test must be repeated to help define the infection status.","conditions":[]},{"flag":"abnormal","label":{"short":"Detected","long":"Detected","orientation":"horizontal"},"values":{"min":35,"max":65},"text":"A positive or detected CMV IgM test result can indicate whether a first-time infection, a reactivation of the latent virus, or a reinfection. IgM antibodies can persist for weeks to months after the infection.","conditions":["Cytomegalovirus"]}],"units":[{"printSymbol":"units\/mL","code":"[arb'U]\/mL","name":"arbitrary unit per milliliter"}],"hideunits":false,"value":15}[{"normal":0},{"borderline":0},{"abnormal":0}]
Use the slider below to see how your results affect your health.
units/mL
30
35
Your result is Not detected.
A negative or not detected result indicates that you are not experiencing a recent infection; however, it does not rule out a past infection.
Related conditions
Cytomegalovirus (CMV) tests check for signs of CMV in your blood, sputum, or other body fluids. CMV is a virus in the herpes family. Other types of herpes viruses include the viruses that cause chickenpox and mononucleosis (mono).
CMV is a common virus that infects people of all ages. Most people have been exposed to CMV during childhood. Once you get a CMV infection, the virus stays in your body for the rest of your life. Most of the time, the virus stays dormant (inactive). However, it can become active again (reactivated) in certain situations, such as when you are under a lot of stress or if you have an immune system problem.
If the CMV virus is active, it can be spread through body fluids such as:
- Saliva
- Urine
- Blood
- Tears
- Semen
- Breast milk
Most healthy people don't have any signs or symptoms when they get CMV. They usually aren’t even aware that they have the infection. But sometimes a CMV infection may cause mild, flu-like symptoms in healthy people.
However, certain people are at higher risk of health problems from a CMV infection:
- People with weakened immune systems due to conditions such as HIV or cancer. For them, CMV can cause vision problems and other serious health problems.
- People who are pregnant and have an active CMV infection. They can pass the virus to their developing baby. In severe cases, this could lead to the loss of the baby through a miscarriage or stillbirth.
- Newborns who got a CMV infection before they were born. This type of CMV is known as congenital CMV. Most babies born with CMV do not have health problems from the virus. Of the babies that do, the most common long-term health problem is hearing loss. Congenital CMV can also cause vision problems, intellectual disabilities, and other serious disorders.
- Very low birth weight and premature infants. They can get a CMV infection during childbirth or from breastfeeding. They are less able than healthy babies to fight the infection.
CMV testing can help those at risk for complications get the treatment they need. While there is no cure for CMV, antiviral medicines and other treatments may reduce your symptoms and improve outcomes.
Other names: CMV IgG and IgM, cytomegalovirus antibody
CMV tests help diagnose a current, reactivated, or past CMV infection in people at risk for health complications. Risk groups include:
- People with weakened immune systems due to certain infections or diseases
- People who have recently received an organ transplant
- Pregnant people with symptoms of a CMV infection
- Newborns with signs or symptoms of infection
You may need testing if you have a weakened immune system or are pregnant and have the following symptoms:
- Swollen lymph nodes ("swollen glands")
- Sore throat
- Fever
- Fatigue
- Weakness
- Muscle aches
- Headache
Your baby may need this test if they have the following symptoms:
- Jaundice, a condition that causes your skin and eyes to turn yellow
- Low birth weight
- Small head
- Hearing and/or vision problems
- Seizures
- Rash
There are several types of CMV tests, including:
Blood tests
This is the most common way to test adults for CMV.
- A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.
Cerebrospinal fluid (CSF) analysis (spinal tap)
To get a sample of cerebrospinal fluid, a provider will do a procedure called a spinal tap, also known as a lumbar puncture. A spinal tap is usually done in a hospital. During the procedure:
- You will lie on your side or sit on an exam table.
- A provider will clean your back and inject an anesthetic into your skin, so you won't feel pain during the procedure. Your provider may put a numbing cream on your back before this injection.
- When the area on your back is completely numb, your provider will insert a thin, hollow needle between two vertebrae in your lower spine. Vertebrae are the small backbones that make up your spine.
- Your provider will withdraw a small amount of cerebrospinal fluid for testing. This will take about five minutes.
- You'll need to stay very still while the fluid is being withdrawn.
- Your provider may ask you to lie on your back for an hour or two after the procedure. This may prevent you from getting a headache afterward.
Sputum test
Sputum is a thick mucus made in your lungs.
- You may be asked to rinse your mouth out with water before the sample is taken.
- Your provider will ask you to breathe deeply and then cough deeply into a special cup.
- A health care provider will ask you to breathe deeply and then cough deeply into a special cup.
- Your provider may tap you on the chest to help loosen sputum from your lungs.
- If you have trouble coughing up enough sputum, your provider may ask you to breathe in a salty mist to help you cough more deeply.
- If you still can't cough up enough sputum, your provider may perform a procedure called a bronchoscopy. In this procedure, you'll first get a medicine to help you relax, and then a numbing medicine so you won't feel any pain.
- Then a camera attached to a thin, lighted tube will be put through your mouth or nose and into your airway. This helps your provider see the inside of your lungs and airway.
- Your provider will collect a sample from your airway using a small brush or suction
Biopsy
During the test, your provider will remove a small sample of tissue for testing. There are many ways to do a biopsy. The type of biopsy you have depends on the type of cancer you have and where the tumor is located. In general, a biopsy may be done using:
- A hollow needle inserted through your skin. Imaging tests, such as ultrasound, may be used to guide the needle:
  A fine needle aspiration biopsy uses a very thin needle to remove a sample of cells and/or fluid.
  A core needle biopsy uses a larger needle to remove a sample.
Amniocentesis
This procedure is done on pregnant women to see if an unborn baby has been infected with CMV.
- You'll lie on your back on an exam table.
- Your provider will apply a gel to your belly.
- Your provider will move an ultrasound wand-like device, called a transducer, on your belly. Ultrasound uses sound waves to show the position of your baby and placenta so your provider can see where to take a sample of amniotic fluid.
- Your provider will clean your belly.
- Your provider will insert a thin needle into your belly, withdraw a small amount of amniotic fluid, and then remove the needle.
- When the sample is removed, your provider will check your baby's heartbeat with the ultrasound.
- The sample is sent to a lab for testing. Results may take from a few days to a few weeks.
Newborns are usually given a saliva or urine test.
During an infant saliva test:
A saliva specimen is collected within three weeks of your baby's birth and at least an hour after breastfeeding.
- Your provider will insert a sterile swab into your baby's cheek and swirl for several seconds.
- The swab will be placed in a special solution for testing.
During an infant urine test:
- You will be given a special plastic bag that will fit over your baby's genital area.
- You will place a diaper over the bag.
- After your baby has urinated, you will remove the bag from the diaper and empty the urine into a container given to you by your provider.
CMV tests are included as part of a TORCH panel, a group of blood tests used to screen newborns and sometimes pregnant people for the following infections:
- TOxoplasmosis
- Rubella
- Cytomegalovirus
- Herpes simplex virus
These infections can cause birth defects if a mother gets any of these infections during pregnancy. Early diagnosis and treatment may help prevent a baby from getting a serious health problem.
You can't eliminate your risk for CMV, but you can lower your chance of getting infected or spreading the infection by:
- Not sharing food or dishes with a child or putting their pacifier in your mouth.
- Washing your hands well after changing a diaper.
- Wearing gloves and washing your hands well if you are caring for someone who is sick and have contact with their body fluids.
- Using latex condoms correctly every time you have sex. If you or your partner is allergic to latex , you can use polyurethane condoms.
1. Cytomegalovirus (CMV) Tests: MedlinePlus Medical Test [accessed on Oct 25, 2024]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Herpes Testing

Herpes Testing

Also called: Herpes Test, HSV Test, Herpes Culture, Herpes Simplex Viral Culture, HSV-1 Antibodies, HSV-2 Antibodies, HSV DNA, HSV IgG Antibody, HSV IgM Antibody

A herpes (HSV) test checks a sample of your blood or fluid from a sore for a herpes simplex virus (HSV) infection. Different types of HSV cause cold sores (HSV-1) and genital herpes (HSV-2).

Herpes Testing

Also called: Herpes Test, HSV Test, Herpes Culture, Herpes Simplex Viral Culture, HSV-1 Antibodies, HSV-2 Antibodies, HSV DNA, HSV IgG Antibody, HSV IgM Antibody

A herpes (HSV) test checks a sample of your blood or fluid from a sore for a herpes simplex virus (HSV) infection. Different types of HSV cause cold sores (HSV-1) and genital herpes (HSV-2).

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Use the slider below to see how your results affect your health.
IV
0.9
1.1
Your result is Not detected.
A negative or not detected result means that the herpes virus was not found in your bloodstream.
Related conditions
{"label":"HSV IgM Ab reference range","description":"This test looks for herpes simplex virus (HSV) type 1 and\/or 2 antibodies in a sample of blood. IgM is a type of antibody that is first released after you get infected. The presence of IgM antibodies indicate a current or recent infection. However, IgM lacks adequate predictive value for acute infection.","scale":"lin","step":0.1,"items":[{"flag":"negative","label":{"short":"Not detected","long":"Not detected","orientation":"horizontal"},"values":{"min":0,"max":0.9},"text":"A negative or not detected result means that the herpes virus was not found in your sample.","conditions":[]},{"flag":"borderline","label":{"short":"Indeterminate","long":"Indeterminate","orientation":"horizontal"},"values":{"min":0.9,"max":1.1},"text":"An equivocal or indeterminate result means that results are inconclusive. Repeat testing in 10-14 days may be helpful.","conditions":[]},{"flag":"positive","label":{"short":"Detected","long":"Detected","orientation":"horizontal"},"values":{"min":1.1,"max":2},"text":"A positive or detected result means IgM antibody to HSV are present in your sample, which may indicate a current or recent infection. However, low levels of IgM antibodies may occasionally persist for more than 12 months post-infection.","conditions":[]}],"units":[{"printSymbol":"IV","code":"{index_val}","name":"index value"}],"hideunits":false,"value":0.4}[{"negative":0},{"borderline":0},{"positive":0}]
Use the slider below to see how your results affect your health.
IV
0.9
1.1
Your result is Not detected.
A negative or not detected result means that the herpes virus was not found in your sample.
Related conditions
Herpes is a common viral infection caused by the herpes simplex virus (HSV). Most people with HSV don't have any symptoms. But HSV can cause painful blisters or sores on the affected parts of the body. HSV mostly affects the mouth (oral herpes) and the vagina or penis (genital herpes), but it can also affect the eyes and other parts of the skin.
HSV tests look for signs of the herpes simplex virus usually in a sample of your blood or fluid from a sore. There are two main types of HSV, and testing can tell which type you have:
- HSV-1 usually causes oral herpes, which can result in cold sores ("fever blisters") on or around your mouth. Most people get oral herpes by the time they're young adults. It's usually spread by non-sexual contact with saliva (spit) from a person who has an HSV-1 infection. That may happen if you share forks, cups, or towels. HSV-1 can also cause genital herpes. This may happen if you receive oral sex from a partner with a cold sore.
- HSV-2 is the most common cause of genital herpes. Genital herpes is a sexually transmitted disease (STD). That means you get it through sexual contact with a person who has a herpes infection. You can catch genital herpes from someone even if they don't have symptoms. HSV-2 can also spread to the mouth, causing oral herpes. This may happen if you give oral sex to a person who has genital herpes from HSV-2.
HSV infections are likely to clear up and come back in the future, but outbreaks tend to be milder and less frequent over time. Repeat outbreaks happen more often with HSV-2 than with HSV-1. So, testing to find out which type you have helps you know what to expect.
There are a few types of HSV tests:
- A swab test takes a sample of fluid from a sore, which may be used to do:
  A viral culture. For this test, cells from your sample are grown in a lab and then checked for HSV.
  A polymerase chain reaction (PCR) test. This test looks for genetic material from HSV in your sample.
- A blood test looks for HSV antibodies in a blood sample. HSV antibodies are proteins that your immune system makes fight the virus. Your body makes different antibodies for HSV-1 and HSV-2. This test can be done when you don't have sores.
There is no cure for HSV, but medicines can help manage outbreaks. HSV usually doesn't cause any major health problems. But if you're pregnant and have genital herpes, you can pass the virus to your child. This can lead to a life-threatening HSV infection for your baby. In rare cases, HSV can infect your brain and spinal cord, causing serious illness.
An HSV test may be used to:
- Find out whether sores on your mouth or genitals are caused by HSV and, if so, which type
- Check for an HSV infection if you've had a high risk of exposure to the virus
- Check for an HSV infection in a baby born to a person who has HSV
You may need an HSV test if:
- You have symptoms of herpes. Symptoms of a first HSV infection may include:
  Blisters or sores on the mouth, genitals, anus, buttocks, or other areas of skin. The sores develop a crust as they begin to heal.
  Fever and flu-like symptoms.
  Swollen glands.
  Pain or tingling in the affected area.
- Your partner has genital herpes or symptoms that might be genital herpes
In general, medical experts don't recommend HSV testing for people without symptoms of HSV. If you are being tested for other STDs, your health care provider may choose to include an HSV test based on your risk of exposure. Ask your provider if you should be tested.
In rare cases, HSV can infect the brain and spinal cord, leading to encephalitis or meningitis. You may need an HSV test if you have one of these serious conditions.
There are several different types of tests for HSV that use different samples:
- For a swab test, a health care professional will use a swab to collect fluid and cells from a herpes sore that has not begun to heal yet.
- For a blood test, a health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.
At-home tests are available for HSV. These tests usually use a sample of blood that you collect at home and send to a lab. Talk with your provider to find out if at-home testing is right for you.
If your provider thinks you have an HSV infection in your spinal cord or brain, you may have a test of your cerebrospinal fluid (CSF) to look for signs of the virus. CSF is a fluid that flows in and around your brain and spinal cord. A thin needle is inserted into your spine to remove a small amount of CSF. This procedure is called a lumbar puncture or spinal tap.
The meaning of your test results depends on the type of HSV test you had. To understand your results, your provider will consider your health history and any symptoms you have.
In general:
- Negative/Normal test results mean that signs of the herpes virus were not found in your sample and you are unlikely to have an HSV infection. If you had a blood test for HSV antibodies, it's important to know that you can have a negative result when you really do have a herpes infection. That's because your body takes up to three months to make HSV antibodies. If you had a blood test too soon after an infection began, your test result may not show any antibodies.
- Positive/Abnormal test results mean that signs of HSV were found in your sample. If you had a blood test that showed you have HSV antibodies, the antibodies could be from an active infection now or a past infection.
If you have HSV, treatment can help reduce the number of outbreaks and control your symptoms. It's important to know that having an HSV infection may increase your risk of getting HIV and other STDs. So, talk with your provider about HIV testing along with other STDs.
It's also important to take steps to avoid spreading HSV to others. Using condoms can help. Since outbreaks come and go, ask your provider how to know when your risk for spreading the herpes virus may be high.
The best way to prevent genital herpes or another STD is not to have sex. If you are sexually active, you can reduce your risk of infection by:
- Having sex with only one person who has sex only with you (mutual monogamy) after both of you are tested for STDs.
- Using condoms correctly every time you have sex.
1. Herpes (HSV) Test: MedlinePlus Medical Test [accessed on Aug 09, 2023]
2. CDC – Genital Herpes Screening [accessed on Nov 05, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Hepatitis B Surface Antigen Test

Hepatitis B Surface Antigen Test

Also called: HBsAg, HBV surface antigen, Hepatitis-associated Antigen, Hepatitis B surface Ag

Hepatitis B virus (HBV) produces a disease known as Hepatitis B which is characterized by liver inflammation. Hepatitis B surface antigen (HBsAg) is a protein on the surface of the hepatitis B virus and it can be used to help diagnose the status of HBV infection and to determine whether vaccination is necessary.

Hepatitis B Surface Antigen Test

Also called: HBsAg, HBV surface antigen, Hepatitis-associated Antigen, Hepatitis B surface Ag

Hepatitis B virus (HBV) produces a disease known as Hepatitis B which is characterized by liver inflammation. Hepatitis B surface antigen (HBsAg) is a protein on the surface of the hepatitis B virus and it can be used to help diagnose the status of HBV infection and to determine whether vaccination is necessary.

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Use the slider below to see how your results affect your health.
Your result is Negative.
Related conditions
The Hepatitis B surface antigen test is used to:
- Diagnose either acute, recent, or chronic hepatitis B infection.
- Determine the status of chronic hepatitis B infection.
Your doctor may want to order this test in the following situations:
- If you have ever used injected drugs, even if it was only one time.
- If you are suffering from chronic liver disease, HIV or AIDS.
- If you have acute liver disease or abnormal liver tests.
- If you are on hemodialysis.
- Anyone born to a mother who was diagnosed with HBV.
- Health care providers or lab technicians who were exposed to blood through accidental needle sticks or injuries with sharp objects.
If the hepatitis B surface antigen result is:
- Negative: this means that no antigens for HBV were found in your blood, which indicates that you are not immune against the virus.
- Positive: this indicates infection by hepatitis B virus, either acute, chronic, or past.
Even though some infected people can stay asymptomatic, some of the more common signs and symptoms of HBV infection may include:
- Nausea
- Fatigue
- Hyporexia (appetite loss)
- Joint pain
- Itching
- Abdominal pain
- Jaundice (yellowing of the skin and eyes)
- Dark-colored urine
- Light-colored stools
1. Hepatitis B | HBV | MedlinePlus [accessed on Oct 03, 2018]
2. Hepatitis B | NIDDK [accessed on Oct 03, 2018]
3. HBAB - Clinical: Hepatitis B Surface Antibody, Qualitative/Quantitative, Serum [accessed on Oct 03, 2018]
4. HBAG - Clinical: Hepatitis B Surface Antigen, Serum [accessed on Oct 03, 2018]
5. Hepatitis B Surface Antigen - Health Encyclopedia - University of Rochester Medical Center [accessed on Oct 03, 2018]
6. Hepatitis B Testing [accessed on Oct 03, 2018]
7. 006510: Hepatitis B Surface Antigen | LabCorp [accessed on Oct 03, 2018]
8. 006530: Hepatitis B Surface Antibody, Quantitative | LabCorp [accessed on Oct 03, 2018]
9. 006395: Hepatitis B Surface Antibody, Qualitative | LabCorp [accessed on Oct 03, 2018]
10. 037215: Hepatitis B Virus (HBV) Evaluation Profile | LabCorp [accessed on Oct 03, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (6)

Hepatitis B Vaccines

CDC/ Betty Partin

Interpretation of Hepatitis B Serologic Test Results

CDC

12:36

The Liver Story (all about Hepatitis B)

Thinkonisms/YouTube

3:51

Living with Hepatitis B

Health Science Channel/YouTube

1:20

Screening for Hepatitis A, B, and C

RWJBarnabas Health/YouTube

8:13

Hepatatis B Awareness

campaign4hiv/YouTube

Syphilis Tests

Syphilis Tests

Also called: Rapid Plasma Reagin, RPR Test, Venereal Disease Research Laboratory, VDRL Test, Syphilis Antibody Tests, Treponema pallidum, RPR, VDRL, FTA-ABS

Syphilis tests are used to screen for and diagnose syphilis, a bacterial infection spread by sexual contact. Screening tests for syphilis usually include RPR and VDRL tests. A positive screening result is confirmed by a test that looks for antibodies that your immune system makes only to fight off syphilis.

Syphilis Tests

Also called: Rapid Plasma Reagin, RPR Test, Venereal Disease Research Laboratory, VDRL Test, Syphilis Antibody Tests, Treponema pallidum, RPR, VDRL, FTA-ABS

Syphilis tests are used to screen for and diagnose syphilis, a bacterial infection spread by sexual contact. Screening tests for syphilis usually include RPR and VDRL tests. A positive screening result is confirmed by a test that looks for antibodies that your immune system makes only to fight off syphilis.

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Use the slider below to see how your results affect your health.
Your result is Negative.
A negative or nonreactive result means you don't have syphilis. If you have a history of syphilis and your RPR test is negative or nonreactive, it is likely that you no longer have syphilis. False-negatives may occur in people with early- and late-stage syphilis. More testing may be needed before ruling out syphilis.
Related conditions
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Use the slider below to see how your results affect your health.
Your result is Negative.
A negative test is normal. It means that no antibodies to syphilis have been seen in your blood sample. The screening test is most likely to be positive in the secondary and latent stages of syphilis. This test may give a false-negative result during early- and late-stage syphilis. This test must be confirmed with another blood test to make the diagnosis of syphilis.
Related conditions
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Use the slider below to see how your results affect your health.
Your result is Non-reactive.
T. pallidum were not found in your sample.
Related conditions
Syphilis tests screen for and diagnose syphilis by looking for certain antibodies in your blood. Antibodies are proteins that your immune system makes when it finds harmful substances in your body.
Syphilis testing usually involves two steps. In most cases, the first step is a screening test to check for antibodies that are linked to having a syphilis infection. But other things may trigger your immune system to make these antibodies, such as autoimmune diseases, other infections, and vaccinations.
Screening tests for syphilis usually include:
- Rapid plasma reagin (RPR), which is a blood test.
- Venereal Disease Research Laboratory (VDRL) test, which can be done on blood or spinal fluid
If the result of your screening test shows you have antibodies linked to syphilis infections, you'll need a second test to confirm whether or not you have syphilis.
Usually, the second test looks for antibodies that your immune system makes only to fight off syphilis. If you have these antibodies, it means you have a syphilis infection now, or you had a syphilis infection that was treated in the past. Common tests to check for syphilis antibodies include:
- Treponema pallidum particle agglutination assay (TP-PA)
- Fluorescent treponemal antibody absorption (FTA-ABS) test
- Microhemagglutination assay for antibodies to T. pallidum (MHA-TP)
- T. pallidum hemagglutination assay (TPHA)
- T. pallidum enzyme immunoassay (TP-EIA)
- Chemiluminescence immunoassays (CLIA)
In some cases, a health care provider will use a test that looks for actual syphilis bacteria, instead of antibodies. These tests are used less often because they can only be done in specialized labs.
You should get tested for syphilis if you have symptoms of syphilis or if your sexual partner was recently diagnosed with syphilis. Symptoms usually appear about two to three weeks after infection and include:
- Small, painless sore (chancre) on the genitals, or in the mouth, anus, or rectum
- Rough, red rash, usually on the palms of the hands or the bottom of the feet
- Fever
- Headache or muscle aches
- Sore throat
- Swollen glands
- Fatigue
- Weight loss
- Hair loss in patches
Even if you don't have symptoms, you should get tested regularly if you have a high risk for getting syphilis. You're more likely to get syphilis if you have:
- Multiple sex partners
- A partner with multiple sex partners
- Unprotected sex (sex without using a condom)
- An HIV infection and are sexually active
- Another sexually transmitted disease, such as gonorrhea
- Sex with men who have sex with men (MSM)
Ask your provider you how often you should get tested.
You will also need a syphilis test if you are pregnant. If you pass it to your baby, it could cause serious, and sometimes deadly, health problems in the baby.
The Centers for Disease Control and Prevention recommends that all pregnant people have a syphilis test at their first prenatal visit. Pregnant people who are more likely to become infected with syphilis should be tested again at 28 weeks of pregnancy and at delivery.
A syphilis test is usually a blood test. During a blood test, a health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.
At any stage, syphilis can affect your brain, spinal cord, and nerves If your symptoms show that syphilis may be affecting your brain and nervous system, your provider may order a syphilis test of your cerebrospinal fluid (CSF).
CSF is a clear fluid found in your brain and spinal cord. To get a sample of the fluid, a provider will do a procedure called a lumbar puncture, also known as a spinal tap. During the procedure:
- You will lie on your side or sit on an exam table.
- A health care provider will clean your back and inject an anesthetic into your skin, so you won't feel pain during the procedure. Your provider may put a numbing cream on your back before this injection.
- Once the area on your back is completely numb, your provider will insert a thin, hollow needle between two vertebrae in your lower spine. Vertebrae are the small backbones that make up your spine.
- Your provider will withdraw a small amount of cerebrospinal fluid for testing. This will take about five minutes.
- You'll need to stay very still while the fluid is being withdrawn.
- Your provider may ask you to lie on your back for an hour or two after the procedure. This may prevent you from getting a headache afterward.
1. Syphilis Tests: MedlinePlus Medical Test [accessed on May 17, 2024]
2. Syphilis Tests / University of Michigan Health System (UMHS) [accessed on Feb 04, 2022]
3. 082370: Treponema pallidum Antibodies | LabCorp [accessed on Sep 27, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (22)

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Secondary syphilis keratotic lesions : These keratotic lesions on the palms are due to secondary syphilis

Secondary syphilis keratotic lesions : These keratotic lesions on the palms are due to secondary syphilis.Syphilis is a complex sexually transmitted disease (STD) caused by the bacterium Treponema pallidum. It has often been called "the great imitator" because so many of the signs and symptoms are indistinguishable from those of other diseases.

Image by CDC / ID 3489

Treponema pallidum Bacteria (Syphilis)

This highly-magnified scanning electron microscopic (SEM) image depicts a number of spiral-shaped, Treponema pallidum bacteria, atop a culture of cotton-tail rabbit epithelium cells, also known as Sf1Ep-cells. T. pallidum is the causative agent of syphilis.

Image by CDC/ Dr. David Cox

Syphilis

This illustration depicts a photomicrograph of a culture specimen processed using the Levaditi staining method, and reveals the presence of corkscrew shaped, Treponema pallidum bacteria, also known as spirochetes. T. pallidum is the cause of the sexually transmitted disease (STD) syphilis.

Image by CDC

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Syphilis

A photograph of condylomata lata lesions involving the vulva and anal region. : A patient with condylomata lata, which can develop during secondary syphilis, and presents as gray, raised papules appearing on the vulva and near the anus, or in any other warm intertriginous region.

Image by CDC/Susan Lindsley ID 2372

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Secondary syphilis

This patient presented with several infrascrotal condylomatous lesions, which is one of the manifestations of secondary syphilis.

Image by CDC / Susan Lindsley ID 6761

Treponema pallidum

This photomicrograph depicts a Treponema pallidum bacterium, a spirochete 5 - 15 micrometers in length, which is the causative agent of syphilis. Syphilis is passed from person to person through direct contact with a syphilis sore. Sores occur mainly on the external genitals, vagina, anus, or in the rectum. Sores also can occur on the lips and in the mouth. Transmission of the organism occurs during vaginal, anal, or oral sex. Pregnant women with the disease can pass it to the babies they are carrying. Syphilis cannot be spread through contact with toilet seats, doorknobs, swimming pools, hot tubs, bathtubs, shared clothing, or eating utensils.

Image by CDC/ Susan Lindsley ID 14969

Treponema pallidum Bacteria (Syphilis)

Electron micrograph imagery of Treponema pallidum, the bacteria that cause syphilis, including a foreground close-up of a single particle. Spiral-shaped bacteria are colorized in gold. Credit: NIAID

Image by NIAID

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Syphilis

Keratotic lesions : This photograph shows a close-up view of keratotic lesions on the palms of this patient's hands due to a secondary syphilitic infection.

Image by CDC / Robert Sumpter ID 6809

Syphilis

Primary Stage of Syphilis : This patient presented with a shoulder lesion during the primary stage of syphilis, which was diagnosed after performing a "darkfield" examination.

Image by CDC/ Dr. Dancewicz ID 6734

Treponema pallidum

Spiral-shaped Treponema pallidum bacteria. An electron photomicrograph of two spiral-shaped Treponema pallidum bacteria. Here we see two Treponema pallidum bacteria scanned by an electron microscope, magnified 36,000X. T. pallidum is the causative agent of syphilis. It contains one of the smallest prokaryotic genomes consisting of about 1000 kilobase pairs.

Image by CDC/ Joyce Ayers ID 2392

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Secondary syphilis

A photograph of a secondary syphilitic papulosquamous rash seen on the torso and upper body.This patient had an extensive papulosquamous rash that developed during secondary syphilis. The rash often appears as rough, red or reddish brown spots that can appear on palms of hands, soles of feet, the chest and back, or other parts of the body.

Image by CDC /Susan Lindsley ID 2364

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Syphilis

Primary Syphilitic Chancre : Photograph of primary syphilitic chancre of the glans penis. This patient has a primary syphilitic chancre of the glans penis. A chancre is a primary skin lesion of syphilis, which begins at the site of inoculation after an interval of 10-30 days, and appears as a papule or red ulcerated skin lesion.

Image by CDC/Susan Lindsley ID 2359

Treponema pallidum

A photomicrograph of a virulent Treponema pallidum bacterium, ruptured at 6,000 psi. Treponema pallidum is the causative agent of syphilis. It contains one of the smallest prokaryotic genomes consisting of about 1000 kilobase pairs.

Image by CDC, VDRL Dept. ID 2324

Treponema pallidum

A photomicrograph of a whole mount of virulent Treponema pallidum. This microscopic bacterium (spirochete) is a worm-like spiral-shaped organism that wiggles vigorously when viewed under a microscope.

Image by CDC / VDRL Department ID 2323

Treponema pallidum

Electron micrograph of Treponema pallidum on cultures of cotton-tail rabbit epithelium cells (Sf1Ep).

Image by CDC/ Dr. David Cox ID 1976

Treponema pallidum

Electron micrograph of Treponema pallidum on cultures of cotton-tail rabbit epithelium cells (Sf1Ep).

Image by CDC/ Dr. David Cox ID 1975

Treponema pallidum

Electron micrograph of Treponema pallidum on cultures of cotton-tail rabbit epithelium cells (Sf1Ep).

Image by CDC/ Dr. David Cox ID 1972

Treponema pallidum

Electron micrograph of Treponema pallidum on cultures of cotton-tail rabbit epithelium cells (Sf1Ep). Treponema pallidum is a spiral-shaped, Gram-negative, highly mobile bacterium.

Image by CDC/ Dr. David Cox ID 1971

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Secondary syphilis Secondary syphilitic infection on tongue

Secondary syphilitic infection on tongue : This image depicts the dorsal surface of the tongue in the case of an elderly African-American male, due to what was determined to be a secondary syphilitic infection. Note the furrowed appearance, and the papillae-free, i.e., desquamated, smooth lingual surface.

Image by CDC / Robert E. Sumpter ID 12627

Syphilis Health Byte

Video by LIVESTRONG.COM/YouTube

Syphilis ¦ Treatment and Symptoms

Video by MainMD/YouTube

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Illustration of syphilis bacteria

Syphilis is a sexually transmitted disease (STD) caused by the bacterium <em>Treponema pallidum</em>. The disease is communicated through direct contact with syphilitic chancre sores, the first of which develops at the site (genitals, vagina, anus, rectum, lips, mouth) where syphilis entered the body. The disease advances in stages that, left untreated, can eventually cause paralysis, blindness, dementia, and life-threatening damage to internal organs. Syphilis is usually transmitted through sexual contact but can also be spread from mother to developing baby, with serious risk to the fetus' survival, and to a newborn during childbirth.

Image by CDC

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Secondary syphilis keratotic lesions : These keratotic lesions on the palms are due to secondary syphilis

CDC / ID 3489

Treponema pallidum Bacteria (Syphilis)

CDC/ Dr. David Cox

Syphilis

CDC

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Syphilis

CDC/Susan Lindsley ID 2372

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Secondary syphilis

CDC / Susan Lindsley ID 6761

Treponema pallidum

CDC/ Susan Lindsley ID 14969

Treponema pallidum Bacteria (Syphilis)

NIAID

Sensitive content

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Syphilis

CDC / Robert Sumpter ID 6809

Syphilis

CDC/ Dr. Dancewicz ID 6734

Treponema pallidum

CDC/ Joyce Ayers ID 2392

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Secondary syphilis

CDC /Susan Lindsley ID 2364

Sensitive content

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Syphilis

CDC/Susan Lindsley ID 2359

Treponema pallidum

CDC, VDRL Dept. ID 2324

Treponema pallidum

CDC / VDRL Department ID 2323

Treponema pallidum

CDC/ Dr. David Cox ID 1976

Treponema pallidum

CDC/ Dr. David Cox ID 1975

Treponema pallidum

CDC/ Dr. David Cox ID 1972

Treponema pallidum

CDC/ Dr. David Cox ID 1971

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Secondary syphilis Secondary syphilitic infection on tongue

CDC / Robert E. Sumpter ID 12627

4:52

Syphilis Health Byte

LIVESTRONG.COM/YouTube

1:52

Syphilis ¦ Treatment and Symptoms

MainMD/YouTube

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Illustration of syphilis bacteria

CDC

HIV Antibody Tests

HIV Antibody Tests

Also called: HIV-1/HIV-2 Testing, HIV Antibody, HIV-1/HIV-2 Differentiation

HIV antibody tests look for HIV antibodies in your blood, saliva (spit), or urine (pee). HIV antibodies are disease-fighting proteins that your immune system makes when you have an HIV infection. An antibody test can be used to screen for HIV or to differentiate between HIV-1 or HIV-2 infection.

HIV Antibody Tests

Also called: HIV-1/HIV-2 Testing, HIV Antibody, HIV-1/HIV-2 Differentiation

HIV antibody tests look for HIV antibodies in your blood, saliva (spit), or urine (pee). HIV antibodies are disease-fighting proteins that your immune system makes when you have an HIV infection. An antibody test can be used to screen for HIV or to differentiate between HIV-1 or HIV-2 infection.

{"label":"HIV antibody reference range","description":"This test looks for the presence of HIV antibodies in a sample of blood or oral fluid (saliva). HIV antibodies are disease-fighting proteins that the body produces in response to HIV infection. An antibody test can usually detect HIV infection 23 to 90 days after an exposure. This test is used to screen for HIV.","scale":"lin","step":0.25,"items":[{"flag":"negative","label":{"short":"Negative","long":"Negative","orientation":"horizontal"},"values":{"min":0,"max":1},"text":"A negative HIV antibody test means no antibodies were detected. A negative test can rule out an HIV infection. It may also mean that the immune system has not had time to produce antibodies \u2014 antibodies to HIV may take up to six months to develop after the initial exposure.","conditions":[]},{"flag":"positive","label":{"short":"Positive","long":"Positive","orientation":"horizontal"},"values":{"min":1,"max":2},"text":"A positive HIV antibody test means that the body has been exposed to HIV and has produced antibodies in response to this exposure. Further testing is needed to confirm an HIV diagnosis.","conditions":["HIV infection"]}],"hideunits":true,"value":0.5}[{"negative":0},{"positive":0}]
Use the slider below to see how your results affect your health.
Your result is Negative.
A negative HIV antibody test means no antibodies were detected. A negative test can rule out an HIV infection. It may also mean that the immune system has not had time to produce antibodies — antibodies to HIV may take up to six months to develop after the initial exposure.
Related conditions
{"label":"HIV-1\/HIV-2 differentiation reference range","description":"This test is done using a sample of blood to distinguish HIV-1 antibodies from HIV-2 antibodies. When an initial HIV antibody test result is positive, an antibody differentiation test is done to determine whether a person has HIV-1 or HIV-2.","scale":"lin","step":0.25,"items":[{"flag":"negative","label":{"short":"NR","long":"Non-reactive","orientation":"horizontal"},"values":{"min":0,"max":1},"text":"A non-reactive result means that the test is negative for both HIV-1 and HIV-2 antibodies, the 2 types of HIV known to infect humans. Additional testing may be recommended.","conditions":[]},{"flag":"positive","label":{"short":"H1R","long":"HIV-1 reactive","orientation":"horizontal"},"values":{"min":1,"max":2},"text":"An HIV-1 reactive result means that the sample is positive for HIV-1 antibodies. HIV-1 is the most common type of HIV \u2014 around 95% of people living with HIV have HIV-1.","conditions":["HIV-1 infection"]},{"flag":"positive","label":{"short":"H2R","long":"HIV-2 reactive","orientation":"horizontal"},"values":{"min":2,"max":3},"text":"An HIV-2 reactive result means that the sample is positive for HIV-2 antibodies. HIV-2 is mainly present in West Africa and it tends to develop more slowly than HIV-1.","conditions":["HIV-2 infection"]},{"flag":"positive","label":{"short":"HR","long":"HIV reactive","orientation":"horizontal"},"values":{"min":3,"max":4},"text":"An HIV reactive result means that the sample is positive, but undifferentiated. In this case, the sample may be tested by additional methods which allow for differentiation between HIV-1 and HIV-2.","conditions":["HIV infection"]}],"hideunits":true,"value":0.5}[{"negative":0},{"positive":0},{"positive":1},{"positive":2}]
Use the slider below to see how your results affect your health.
Your result is Non-reactive.
A non-reactive result means that the test is negative for both HIV-1 and HIV-2 antibodies, the 2 types of HIV known to infect humans. Additional testing may be recommended.
Related conditions
Human immunodeficiency virus (HIV) debilitates your immune system by harming your white blood cells (leukocytes), making you prone to catch any virus, bacteria, or fungi, including those that usually don’t make people sick.
If left untreated, HIV can lead to acquired immunodeficiency syndrome (AIDS), which is the final stage of the infection.
HIV is transmitted through:
- Unprotected sexual intercourse
- From an infected mother to her fetus
- Lactation from an infected mother
- Having direct contact with the blood of an infected person through an open wound
- From an injury with a blood-covered object (such as a needle)
There are two types of HIV, which are type 1 (HIV-1) and type 2 (HIV-2).The only difference between them is that HIV type 2 is found only in West Africa and an individual can become infected with HIV-2 only by having sexual intercourse or entering in contact with the blood of an infected person from that geographic region.
An HIV antibody test refers to the detection of human immunodeficiency virus type 1 and type 2 antibodies in a sample of your blood.
Usually, screening is done with a combination HIV antigen/antibody test. If that test result comes back positive, an HIV test that differentiates between HIV-1 and HIV-2 antibodies is performed.
HIV screening is the only way to know if you are infected. Is recommended that any person between the ages of 13 to 64 years and every pregnant woman gets tested for HIV at least once.
There are other situations in which you should also be tested, even if you were already screened or if you don’t belong to the group of people who are between 13 to 64 years of age. These situations include:
- If you were diagnosed with tuberculosis, hepatitis B or C, or another sexually transmitted disease.
- If you had a sexual partner who has been recently diagnosed with HIV.
- If you suspect or know that your partner had sex with another person.
- If you are a healthcare worker and had direct contact with blood while doing your job.
- If you think you may have been exposed to the virus.
Annual screening for HIV is recommended if you are at high-risk of contracting the virus. You have a higher risk if you:
- Have had unprotected sex with multiple partners since your last HIV screening.
- Are a man and had sex with another man
- Have used illegal injected drugs, especially if you have shared needles
- Have a sexual partner who is HIV positive.
- Are a sex-worker
Normally this test is indicated when a previous screening HIV test has been performed, and the result has come back positive.
Therefore, if this test comes back negative for HIV-1and HIV-2, it means that a disparity has occurred, and then a third test (HIV RNA) must be performed to get to a firm diagnosis.
If the HIV antibody test has come back positive, the possibilities include:
- HIV-1 antibody positive + HIV-2 antibody negative: is confirmed that you have an HIV type 1 infection.
- HIV-1 antibody negative + HIV-2 antibody positive: is confirmed that you have an HIV type 2 infection.
- HIV-1 antibody positive + HIV-2 antibody positive: you have a co-infection with both types of HIV.

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (12)

When HIV Becomes AIDS (HIV #2)

Video by Healthguru/YouTube

Medical Animation: HIV and AIDS

Video by Nucleus Medical Media/YouTube

HIV-1 budding from lymphocyte

This digitally colorized scanning electron microscopic (SEM) image revealed the presence of the green, spherical, human immunodeficiency virus (HIV-1), which had been co-cultivated with human lymphocytes. Note the lymphocyte in the lower left, and some of its extended pseudopodia. The HIV-1 virions can be seen on the surface of this lymphocyte.

Image by CDC/ C. Goldsmith, P. Feorino, E. L. Palmer, W. R. McManus

human immunodeficiency virus (HIV)

HIV. See a full animation of this medical topic

Image by BruceBlaus

HIV Drug Classes

Schematic description of the mechanism of the four classes of currently available antiviral drugs against HIV: fusion inhibitors ( interfere with the binding, fusion or entry of an HIV virion), reverse-transcriptase inhibitors (interfere with the translation of viral RNA into DNA), integrase inhibitors (block the viral enzyme integrase, that inserts the viral genome into the DNA of the host cell), protease inhibitors (block proteolytic cleavage of protein precursors that are necessary for the production of infectious viral particles).

Image by Thomas Splettstoesser (www.scistyle.com)

HIV-infected H9 T cell

Scanning electromicrograph of an HIV-infected H9 T cell. Credit: NIAID

Image by NIAID

HIV Virus

Transmission electron micrograph of HIV-1 virus particles (red) budding and replicating from a segment of a chronically infected H9 cell (blue). Particles are in various stages of maturity; arc/semi-circles are immature particles that have started to form but are still part of the cell. Immature particles slowly change morphology into mature forms and exhibit the classic “conical or spherical-shaped core.” Image captured at the NIAID Integrated Research Facility (IRF) in Fort Detrick, Maryland. Credit: NIAID

Image by NIAID

HIV-1 Neurotropism

Model of HIV-1 Neurotropism

Image by J Roberto Trujillo

Human Immunodeficiency Virus (HIV)

The most common test for the human immunodeficiency virus (HIV) detects antibodies produced by the immune system that attack foreign particles like HIV. These antibodies are identifiable because they are tailor-made to match specific features of the virus. The human immunodeficiency virus (HIV) enters the body through sexual transmission, blood transfusion with infected blood, or a shared needle contaminated by the blood of another person. The immune system responds to the presence of HIV by producing antibodies specifically directed against the virus (antibodies are identifiable because they are tailor-made to match specific features of the virus they attack). HIV antibodies can be detected between 3-8 weeks after exposure to the virus.

Image by TheVisualMD

(HIV) Ways in which you cannot catch the HIV virus

Ways in which you cannot catch the HIV virus Description : Ways in which you cannot catch the HIV virus from hugging to telephones; one of a series of fact sheets about AIDS and HIV.

Image by Wellcome Trust

Sensitive content

This media may include sensitive content

AIDS Life Cycle Illustration

The human immunodeficiency virus (HIV-I) enters the T-lymphocyte where the virus loses its outer envelop, releasing its RNA and its reverse transcriptase. The reverse transcriptase builds a complimentary DNA strand from the viral RNA template. The DNA helix is inserted into the host genome. When this is transcribed by the infected cell, the new viral RNA and proteins are produced to form new viruses that then bud from the cell membrane, thus completing the life cycle of the virus. See artwork: GR-32.

Image by National Cancer Institute / Trudy Nicholson (Illustrator)

HIV Rotation

The most common test for the human immunodeficiency virus (HIV) detects antibodies produced by the immune system that attack foreign particles like HIV. These antibodies are identifiable because they are tailor-made to match specific features of the virus. The human immunodeficiency virus (HIV) enters the body through sexual transmission, blood transfusion with infected blood, or, in the case of drug addicts, a shared needle contaminated by the blood of another user. HIV antibodies can be detected between 3-8 weeks after exposure to the virus.

Image by TheVisualMD

3:52

When HIV Becomes AIDS (HIV #2)

Healthguru/YouTube

6:52

Medical Animation: HIV and AIDS

Nucleus Medical Media/YouTube

HIV-1 budding from lymphocyte

CDC/ C. Goldsmith, P. Feorino, E. L. Palmer, W. R. McManus

human immunodeficiency virus (HIV)

BruceBlaus

HIV Drug Classes

Thomas Splettstoesser (www.scistyle.com)

HIV-infected H9 T cell

NIAID

HIV Virus

NIAID

HIV-1 Neurotropism

J Roberto Trujillo

Human Immunodeficiency Virus (HIV)

TheVisualMD

(HIV) Ways in which you cannot catch the HIV virus

Wellcome Trust

Sensitive content

This media may include sensitive content

AIDS Life Cycle Illustration

National Cancer Institute / Trudy Nicholson (Illustrator)

HIV Rotation

TheVisualMD

Chorionic Villus Sampling

Chorionic Villus Sampling

Also called: CVS, Chorionic Villus Biopsy, Placental Biopsy, Chorionic Villus Sampling

Chorionic villus sampling (CVS) is a test for pregnant women that checks cells from the placenta. It is used in the first trimester of pregnancy to diagnose certain chromosome and genetic disorders in an unborn baby.

Chorionic Villus Sampling

Also called: CVS, Chorionic Villus Biopsy, Placental Biopsy, Chorionic Villus Sampling

Chorionic villus sampling (CVS) is a test for pregnant women that checks cells from the placenta. It is used in the first trimester of pregnancy to diagnose certain chromosome and genetic disorders in an unborn baby.

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Use the slider below to see how your results affect your health.
Your result is Normal.
If your CVS test results were normal, it is unlikely that your baby has the disorder that was tested. But it does not guarantee that your baby won't have any health problems.
Related conditions
CVS testing is used to diagnose chromosome problems or other genetic diseases in developing baby. These include:
- Down syndrome (also called Trisomy 21), a condition in which a person has an extra chromosome or a piece of a chromosome. This extra copy changes how a baby's body and brain develop and can cause mental and physical challenges during their lifetime.
- Cystic fibrosis (CF), a disease that's inherited (passed down through families). It causes mucus buildup in the lungs and other organs, making it hard to breathe.
- Sickle cell disease (SCD), a group of inherited red blood cell disorders. SCD can cause pain, infections, organ damage, and strokes.
- Tay-Sachs disease, a disorder that causes fatty proteins to build up in the brain. It affects sight, hearing, and mental development. Most children with Tay-Sachs die by the age of 5.
- Trisomy 18 (Edward syndrome), a condition that causes the baby to have growth delays while developing. It also causes physical and mental abnormalities after they are born. Most babies with Trisomy 18 die before birth or within their first month.
CVS testing is very accurate and can be done early in pregnancy, between the 10th and 13th week. But it can only diagnose certain genetic diseases. A CVS test does not diagnose or screen for birth defects such as neural tube defects. These are conditions that cause abnormal development of a developing baby's brain and/or spine. Different tests, including an alpha-fetoprotein (AFP) blood test, are used to screen for or diagnose these and other birth defects.
A CVS test is not a routine pregnancy test. But your health care provider may recommend CVS testing if you are at higher risk for having a baby with a chromosome disorder. The risk factors include:
- Your age. If you are age 35 and older, you have a higher risk of having a baby with Down syndrome or another genetic disorder.
- A family history of a genetic disorder.
- Having another child with a genetic disorder.
You may also need CVS testing if you had abnormal results on a prenatal screening test.
Your provider will use an ultrasound to check your baby's position and guide the procedure. An ultrasound is an imaging test that uses sound waves to look at your tissues and organs. The test usually takes about 30 to 45 minutes.
There are two types of CVS tests:
- Transabdominal (through your abdomen (belly)). A long, thin needle is guided through your abdomen (belly) to take a sample.
- Transcervical (through your vagina). A thin catheter is guided through your cervix, (the lower part of the uterus), to your placenta to take a sample. This is the most common method.
During a transabdominal CVS, your provider will:
- Clean your abdomen with an antiseptic.
- Apply a numbing medicine to your abdomen.
- Insert a long, thin needle through your abdomen and uterus and into the placenta. You may feel a cramping or stinging sensation as the needle enters the uterus.
- Use the needle to withdraw a sample of tissue (villi) from the placenta.
- Remove the needle.
During a transcervical CVS, your provider will:
- Clean your vagina and cervix with an antiseptic.
- Use an instrument called a speculum to gently spread apart the sides of your vagina. This is the same instrument used for a pap test.
- Insert a thin tube through your vagina and cervix and up to the placenta. You may feel a slight twinge or cramping as this is done.
- Use the tube to gently suck in a sample of tissue from the placenta.
- Remove the tube.
You may have light vaginal spotting after the procedure.
A CVS test isn't recommended if you have a sexually transmitted infection (STI) or have had vaginal bleeding during the pregnancy.
CVS is generally considered to be a safe procedure, but it does have some risks. These include:
- Miscarriage (this is a small risk).
- Infection.
- Bleeding.
- Rh sensitization. This is a condition in which your body makes antibodies (proteins made by the immune system) that attack your baby's red blood cells. If diagnosed during pregnancy, it is easily treatable.
- Limb defects in the baby (this is very rare).
Call your provider if you have chills, contractions, a fever, or amniotic fluid leaking after the procedure.
1. Chorionic Villus Sampling (CVS): MedlinePlus Medical Test [accessed on Sep 07, 2024]
2. Chorionic villus sampling: MedlinePlus Medical Encyclopedia [accessed on Sep 07, 2024]
3. Chorionic Villus Sampling (CVS) | Johns Hopkins Medicine. Apr 24, 2024 [accessed on Sep 07, 2024]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (14)

Chorionic Villus Sampling

Video by manny1976/YouTube

Chorionic Villus Sampling (CVS)

Video by Washington State Department of Health/YouTube

Prenatal screening, fetal testing, and other tests during pregnancy

Video by MedLecturesMadeEasy/YouTube

This browser does not support the video element.

Prenatal Diagnostic Testing

If a pregnant woman has an abnormal genetic screening test result, a doctor may suggest a prenatal diagnostic test be done to determine with more certainly whether or not a fetus has a particular disorder. There are two main diagnostic testing procedures, chorionic villus sampling (CVS) and amniocentesis. Both of these tests involve collecting a sample from inside the womb, which is then examined to detect diseases such as Down Syndrome, Edwards Syndrome, neural tube defects, cystic fibrosis, fragile-x, and spinal muscular atrophy. Prenatal diagnostic tests provide valuable information on the health of the fetus and can help alleviate the stress of expectant parents.

Video by TheVisualMD

Diagnostic Testing in Pregnancy

Video by Michigan Medicine/YouTube

Prenatal Testing - What You Need To Know

Video by Rehealthify/YouTube

Amniocentesis: Pre-Baby Care (Pregnancy Health Guru)

Video by Healthguru/YouTube

Chorionic Villus Sampling (CVS) Mnemonic

Video by Medicosis Perfectionalis/YouTube

First Trimester of Pregnancy -- CVS Prenatal Test | Parents

Video by Parents/YouTube

Genetic Testing During Pregnancy

Video by University of California Television (UCTV)/YouTube

Prenatal Screening Options: Chorionic Villus Sampling (CVS)

Video by UNC Center for Maternal and Infant Health/YouTube

Embryo 26 Day Old (Week 5 for Gestational Age) Suspended in Chorionic Cavity

Computer Generated Image from Micro-MRI, actual size of embryo = 4.0 mm - This image presents a right-sided view of the embryo during its fourth week of embryonic development. The age is calculated from the day of fertilization. At the beginning of the 4th week, the heart begins to beat and the embryonic circulation sets in. At the end of 4 weeks over 30 somites are present . Somites are paired blocks of cells which in the later stages of development give rise to connective tissue, bone, muscle and the spine. The embryo is suspended in the protective chorionic cavity by the body stalk (the amniotic cavity and yolk sac have been removed to demonstrate the C-shaped curvature of the embryo). The red spot in the head region indicates the developing eye.

Image by TheVisualMD

Chorionic villi

Chorionic villus

Image by BruceBlaus

Chorionic villi

Schematic view of the placenta and chorion.

Image by Swils6

4:42

Chorionic Villus Sampling

manny1976/YouTube

4:16

Chorionic Villus Sampling (CVS)

Washington State Department of Health/YouTube

18:42

Prenatal screening, fetal testing, and other tests during pregnancy

MedLecturesMadeEasy/YouTube

4:34

Prenatal Diagnostic Testing

TheVisualMD

2:10

Diagnostic Testing in Pregnancy

Michigan Medicine/YouTube

1:45

Prenatal Testing - What You Need To Know

Rehealthify/YouTube

2:01

Amniocentesis: Pre-Baby Care (Pregnancy Health Guru)

Healthguru/YouTube

2:13

Chorionic Villus Sampling (CVS) Mnemonic

Medicosis Perfectionalis/YouTube

2:44

First Trimester of Pregnancy -- CVS Prenatal Test | Parents

Parents/YouTube

4:38

Genetic Testing During Pregnancy

University of California Television (UCTV)/YouTube

5:18

Prenatal Screening Options: Chorionic Villus Sampling (CVS)

UNC Center for Maternal and Infant Health/YouTube

Embryo 26 Day Old (Week 5 for Gestational Age) Suspended in Chorionic Cavity

TheVisualMD

Chorionic villi

BruceBlaus

Chorionic villi

Swils6

Pap Smear

Pap Smear

Also called: Papanicolaou Smear, Cervical Smear, Cervical Cytology, Vaginal Cytology, Cervical Screening, Gynecologic Pap Test, Pap Smear

A Pap smear is a routine test that looks for abnormal cells in the cervix (the uppermost portion of the vagina). Finding and treating these cells early can help prevent cervical cancer.

Pap Smear

Also called: Papanicolaou Smear, Cervical Smear, Cervical Cytology, Vaginal Cytology, Cervical Screening, Gynecologic Pap Test, Pap Smear

A Pap smear is a routine test that looks for abnormal cells in the cervix (the uppermost portion of the vagina). Finding and treating these cells early can help prevent cervical cancer.

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Use the slider below to see how your results affect your health.
Your result is Normal.
A negative or normal test result is reported as "Negative for intraepithelial lesion or malignancy". However, a negative report may also note benign findings such as infections or inflammation.
Related conditions
Your age and health history will help determine how often you should have a Pap smear. If you have a cervix, it's recommended that you have your first Pap smear at age 21.
If you're between ages 21 and 29 and your last Pap test result was normal:
- Your provider may say you can wait three years until your next Pap test.
- At age 25, you should begin screening with an HPV test and have them every five years through age 65.
If you're between ages 30 and 65 and your last Pap smear result was normal:
- Your provider may say you can wait three years until your next Pap smear.
- If you also had a normal HPV test result, your provider may say that you can wait five years until your next test.
- If you had an HPV test and a Pap smear, called co-testing, and had normal results for both, your provider may say that you can wait five years until your next test.
If you're over age 65, talk with your provider about whether you still need Pap smears. If you've had regular screenings with normal results, they may tell you that you don't need Pap smears anymore.
You don't need cervical cancer screening if you had a total hysterectomy (surgery to remove your uterus and cervix) because of a condition that was not cancer. But if your hysterectomy was related to cervical cancer or precancer, ask your provider whether you need screening.
If you are at higher risk of developing cervical cancer, your provider may recommend screening more often. You may be at higher risk if you:
- Had an abnormal HPV test, Pap smear, or cervical biopsy in the recent past.
- Have had a diagnosis of cervical cancer.
- Have HIV. You may also need screenings after age 65.
- Have a weakened immune system.
- Were exposed to a drug called DES (Diethylstilbestrol) before you were born. Between the years 1940-1971, DES was sometimes prescribed to prevent miscarriages. It was later linked to an increased risk of certain cancers in the female children exposed to it before birth.
If you're under age 21, cervical cancer screening is not recommended. Your risk of cervical cancer is very low. Also, any changes in cervical cells will likely go away on their own.
If you are unsure whether you need a Pap smear, talk with your provider.
During a Pap smear:
- You will be asked to undress completely or from the waist down.
- You will lie on an exam table with your knees bent and your heels in footrests called stirrups.
- Your provider will gently insert a plastic or metal instrument called a speculum into your vagina. This helps to widen your vagina so that your cervix can be seen. This may cause a feeling of cramping or pressure.
- Your provider will then use a small, soft brush or swab to collect cells from the cervix. This doesn't usually hurt.
- The cell sample is sent to a lab for examination under a microscope.
A Pap smear is often done as part of a pelvic exam. During a pelvic exam, your provider examines your uterus, ovaries, and genital area. But a pelvic exam doesn't always include a Pap smear. So, when you have a pelvic exam, ask your provider whether you'll have a Pap smear, too.
You should not have a Pap smear while you are having your period because this may affect your results. A good time to have the test is about five days after the last day of your period. For two days before your test, you should not:
- Use tampons
- Use birth control foam, jelly, or cream
- Use other creams or medicines in your vagina
- Douche (rinse the vagina with water or other fluid)
- Have vaginal sex
A Pap smear test could have the following results:
- Normal or "negative" result, which usually means that no abnormal changes were found in your cervix cells. Your provider may tell you that you can wait three years for your next test. If you also had a normal HPV test result, you may be able to wait five years for your next test, depending on your age and medical history.
- Unsatisfactory results, which may mean that the lab sample did not have enough cells, or the cells may have been clumped together or hidden by mucus. Your provider may ask you to come in for another test in a few months.
- Unclear results, which may mean that your cells look abnormal, but it's unclear if it's due to HPV. Unclear results could also be related to pregnancy, menopause, or an infection. An HPV test may help to find out if unclear results are due to HPV. Your provider will let you know if other tests need to be done.
- Abnormal or "positive" result, which usually means that abnormal changes were found in your cervical cells. Most of the time, abnormal results do not mean you have cervical cancer. Minor changes in the cells usually go back to normal on their own. But your provider may recommend a follow-up test to check. More serious cell changes may turn into cancer if they are not removed. Finding and treating these cells early can help prevent cancer from developing.
A Pap smear doesn't diagnose cancer. It's also possible to receive a false-positive result, in which your results appear abnormal, but there are no precancerous or cancerous cells. Or you could have a false-negative, which happens when your results appear normal but there are precancer or cancerous cells.
Talk with your provider to learn what your Pap smear results mean. If they are concerned about your results, they may perform a colposcopy. This is an exam that uses a special magnifying instrument to look closely at your cervix to help diagnose or rule out cervical cancer.
1. Pap Smear: MedlinePlus Medical Test [accessed on Sep 25, 2024]
2. Definition of atypical squamous cells of undetermined significance - NCI Dictionary of Cancer Terms - National Cancer Institute [accessed on Dec 20, 2018]
3. 192005: Gynecologic Pap Test, Liquid-based Preparation | LabCorp [accessed on Dec 28, 2018]
4. https://www.acog.org/Patients/FAQs/Abnormal-Cervical-Cancer-Screening-Test-Results [accessed on Dec 28, 2018]
5. Understanding Abnormal Cervical Cancer Screening Results [accessed on Dec 28, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (19)

A cervical screening test - What can you expect?

Video by Healthchanneltv / cherishyourhealthtv/YouTube

Cervical Dysplasia (Gynecology - Pap Smear)

Video by Med Twice/YouTube

Sensitive content

This media may include sensitive content

Pap Smear showing Chlamydia

Human pap smear showing Chlamydia in the vacuoles at 500x and stained with H&E.

Image by Dr. Lance Liotta Laboratory / Unknown Photographer

Sensitive content

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Pap Test: Pap Smear (Pap Test)

A Pap smear, also called a Pap test, is a procedure to test for cervical cancer as well as a number of different types of infections. The test involves collecting cells from the cervix. A speculum is inserted into the vagina, and samples of cervical cells are collected and examined under a microscope for abnormalities. Detecting cervical cancer early with a Pap smear gives women a greater chance of being cured. A Pap smear can also detect changes in cervical cells that suggest cancer may develop in the future. The Pap smear is usually done in conjunction with a pelvic exam. In women over 30, the Pap smear may be combined with a test for human papillomavirus (HPV), a common sexually transmitted infection that may cause cervical cancer in some women.

Image by TheVisualMD

Pap Test: Human Papillomavirus (HPV)

The human papillomavirus (HPV) is responsible for genital HPV infection, one of the most common sexually transmitted diseases. Incurable and often asymptomatic, genital HPV infection is spread through genital, skin-to-skin contact. It may cause genital warts and can lead to cervical cancer as well as some cases of anal, rectal, and penile cancer. There are more than 100 strains of HPV, and more than 30 of these are transmitted sexually. However, only a small subset of these strains are cancer-causing. Pap smear testing is used to detect abnormal cells caused by genital HPV infection that could lead to cervical cancer if left untreated. HPV vaccines are available for both men and women to prevent infection by some of the more dangerous virus strains associated with the development of cervical cancer.

Image by TheVisualMD

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HPV E6 E7 mRNA and Pap Tests

HPV E6 E7 mRNA and Pap Tests: Pap tests (ie, cervical cytology) are the most common way to screen for cervical cancer and routine Pap testing is credited with widely reducing the incidence of cervical cancer since the tests implementation. Pap tests are, however, limited by their relatively low sensitivity and specificity.Studies suggest that testing for high-risk HPV DNA is a more sensitive method of determining a woman`s risk of developing cervical cancer. Though current high-risk HPV DNA testing methods provide adequate sensitivity, specificity is lacking, which can lead to false-positive results and unnecessary invasive procedures such as colposcopy and biopsy. Its important for every woman to talk to her doctor about what tests are right for her.

Image by TheVisualMD

Pap smears vs HPV testing and cervical cancer detection

Video by Pathology Tests Explained/YouTube

Human Papillomavirus (HPV)

Risk Factors for Cancer: Virus : Medical visualization of an anterior close-up view of a human papillomavirus (HPV) capsid the virus responsible for genital HPV infection one of the most common sexually transmitted infections. Often asymptomatic genital HPV infection is spread through genital skin-to-skin contact causes genital warts and can lead to cervical cancer as well as some cases of anal rectal and penile cancer. There are more than 100 strains of HPV and more than 40 of these are transmitted sexually; however only a small subset of those are cancer-causing. Pap smear testing is used to detect abnormal cells caused by genital HPV infection that could lead to cervical cancer if left untreated. Consistent condom use has been shown to reduce the risk of HPV infection by as much as 70% but condoms do not protect all anatomy vulnerable to the virus. Vaccines that can prevent initial infection of some of the more dangerous strains are widely available.

Image by TheVisualMD

Pap Smear

A female Caucasian scientist examining pap smears under the microscope.

Image by National Cancer Institute / Bill Branson (Photographer)

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Pap Smear Laser

One of the many uses for the laser in medical research is as a light source to detect premalignant and malignant cells in a Pap smear. Gynecologic cells passing in a stream through the laser beam where each cell is analyzed. Abnormal-appearing cells can be sorted from the rest of the cells and later examined by a pathologist for evidence of cancer.

Image by National Cancer Institute / Unknown Photographer

Endometrial Cancer

Endometrial cancer is the most commonly diagnosed gynecological cancer. Women with clear cell endometrial cancer, a rare type of endometrial cancer, generally have poorer clinical outcomes

Image by Darryl Leja, NHGRI

Advanced Cancer Cell Growth in Cervix

Three-dimensional visualization reconstructed from scanned human data. Superiolateral view of cross-section of advanced cancerous cell growth of cervix. Cervical cancer begins with precancerous cellular changes, often caused by human papillomavirus (HPV.) There are two main types of cervical cancer: squamous cell carcinoma (the most common type at 80%+) and adenocarcinoma. Squamous cell carcinoma develops from the cells that cover the surface of the cervix, while adenocarcinoma develops from mucous-producing glandular tissue. Cervical cancer is highly preventable, with precancerous cells visible on a regular Pap smear. Also, a vaccine is being developed that could prevent initial infection of some of the more dangerous strains of HPV that lead to precancerous cellular changes. 3 of 3.

Image by TheVisualMD

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Healthy Cervix

The cervix is the lower portion of the uterus where it joins with the top of the vagina. The opening of the the cervix into the vagina is called the external os, and can vary in appearance from a small, circular opening in women who have not given birth, to a wider, more slit-like opening in women who have had children. Human papillomavirus (HPV) is associated with an increased risk of cervical cancer. Women should be screened for cellular changes of the cervix with a pap smear as part of a regular pelvic exam. Human papillomavirus (HPV) is a large group of related viruses that are often sexually transmitted. Most infections clear up quickly and cause few problems, though HPV can cause genital warts. Infection by certain types of HPV, however, can lead to cervical cancer. In 2006, the FDA approved an HPV vaccine (Gardisil) that protects against viral types that cause most cases of cervical cancer as well as genital warts. Public health experts recommend routine vaccination for girls ages 11-12 to ensure vaccine effectiveness.

Image by TheVisualMD

Studying Cells

These uterine cervix cells, viewed through a light microscope, were obtained from a Pap smear. Normal cells are on the left. The cells on the right are infected with human papillomavirus (HPV). Notice that the infected cells are larger; also, two of these cells each have two nuclei instead of one, the normal number. (credit: modification of work by Ed Uthman, MD; scale-bar data from Matt Russell)

Image by CNX Openstax

Human Papillomavirus (HPV)

Medical visualization of an anterior close-up view of a human papillomavirus (HPV) capsid, the virus responsible for genital HPV infection, one of the most common sexually transmitted diseases. Incurable and often asymptomatic, genital HPV infection is spread through genital, skin-to-skin contact, causes genital warts, and can lead to cervical cancer, as well as some cases of anal, rectal, and penile cancer. There are more than 100 strains of HPV, and more than 30 of these are transmitted sexually; however, only a small subset of those are cancer-causing. Pap smear testing is used to detect abnormal cells caused by genital HPV infection that could lead to cervical cancer if left untreated. A vaccine is being developed that could prevent initial infection of some of the more dangerous strains.

Image by TheVisualMD

Human Papillomavirus (HPV)

Anterior view of a human papillomavirus (HPV) capsid, the virus responsible for genital HPV infection, one of the most common sexually transmitted diseases. Incurable and often asymptomatic, genital HPV infection is spread through genital, skin-to-skin contact, causes genital warts, and can lead to cervical cancer, as well as some cases of anal, rectal, and penile cancer. There are more than 100 strains of HPV, and more than 30 of these are transmitted sexually; however, only a small subset of those are cancer-causing. Pap smear testing is used to detect abnormal cells caused by genital HPV infection that could lead to cervical cancer if left untreated. A vaccine is being developed that could prevent initial infection of some of the more dangerous strains.

Image by TheVisualMD

Normal Cell Growth in Cervix

Three-dimensional visualization reconstructed from scanned human data. Superiolateral view of cross-section of healthy cervical cells. Cervical cancer begins with precancerous cellular changes, often caused by human papillomavirus (HPV.) There are two main types of cervical cancer: squamous cell carcinoma (the most common type at 80%+) and adenocarcinoma. Squamous cell carcinoma develops from the cells that cover the surface of the cervix, while adenocarcinoma develops from mucous-producing glandular tissue. Cervical cancer is highly preventable, with precancerous cells visible on a regular Pap smear. Also, a vaccine is being developed that could prevent initial infection of some of the more dangerous strains of HPV that lead to precancerous cellular changes. 1 of 3.

Image by TheVisualMD

Uterus and Cervix Sagittal Section

Medical visualization of a lateral cross-section of a healthy cervix, as well as the uterus and vagina. Cervical cancer begins with precancerous cellular changes, often caused by human papillomavirus (HPV.) There are two main types of cervical cancer: squamous cell carcinoma (the most common type at 80%+) and adenocarcinoma. Squamous cell carcinoma develops from the cells that cover the surface of the cervix, while adenocarcinoma develops from mucous-producing glandular tissue. Cervical cancer is highly preventable, with precancerous cells visible on a regular Pap smear. Also, a vaccine is being developed that could prevent initial infection of some of the more dangerous strains of HPV that lead to precancerous cellular changes. 1 of 2.

Image by TheVisualMD

Human Papillomavirus (HPV)

Medical visualization of an anterior close-up view of a human papillomavirus (HPV) capsid, the virus responsible for genital HPV infection, one of the most common sexually transmitted infections.

Image by TheVisualMD

2:13

A cervical screening test - What can you expect?

Healthchanneltv / cherishyourhealthtv/YouTube

6:01

Cervical Dysplasia (Gynecology - Pap Smear)

Med Twice/YouTube

Sensitive content

This media may include sensitive content

Pap Smear showing Chlamydia

Dr. Lance Liotta Laboratory / Unknown Photographer

Sensitive content

This media may include sensitive content

Pap Test: Pap Smear (Pap Test)

TheVisualMD

Pap Test: Human Papillomavirus (HPV)

TheVisualMD

Sensitive content

This media may include sensitive content

HPV E6 E7 mRNA and Pap Tests

TheVisualMD

3:40

Pap smears vs HPV testing and cervical cancer detection

Pathology Tests Explained/YouTube

Human Papillomavirus (HPV)

TheVisualMD

Pap Smear

National Cancer Institute / Bill Branson (Photographer)

Sensitive content

This media may include sensitive content

Pap Smear Laser

National Cancer Institute / Unknown Photographer

Endometrial Cancer

Darryl Leja, NHGRI

Advanced Cancer Cell Growth in Cervix

TheVisualMD

Sensitive content

This media may include sensitive content

Healthy Cervix

TheVisualMD

Studying Cells

CNX Openstax

Human Papillomavirus (HPV)

TheVisualMD

Human Papillomavirus (HPV)

TheVisualMD

Normal Cell Growth in Cervix

TheVisualMD

Uterus and Cervix Sagittal Section

TheVisualMD

Human Papillomavirus (HPV)

TheVisualMD

Prenatal Ultrasound

Prenatal Ultrasound

Also called: Fetal Ultrasound, Pregnancy Sonography, Pregnancy Sonogram, Obstetric Ultrasonography, Ultrasound - Prenatal

Prenatal ultrasound is an imaging technique that uses high-frequency sound waves to generate images of the fetus. Ultrasounds can be performed at any time; however, they are usually done and are more useful during the first trimester of pregnancy.

Prenatal Ultrasound

Also called: Fetal Ultrasound, Pregnancy Sonography, Pregnancy Sonogram, Obstetric Ultrasonography, Ultrasound - Prenatal

Prenatal ultrasound is an imaging technique that uses high-frequency sound waves to generate images of the fetus. Ultrasounds can be performed at any time; however, they are usually done and are more useful during the first trimester of pregnancy.

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Use the slider below to see how your results affect your health.
Your result is Normal.
* Your baby is growing at a normal rate.
* You have the right amount of amniotic fluid.
* No birth defects were found, though not all birth defects will show up on a sonogram.
Related conditions
1. First Trimester / Dating Ultrasound | Advanced Women's Imaging [accessed on Oct 02, 2018]
2. http://www.advancedwomensimaging.com.au/second-trimester-morphology-ultrasound [accessed on Jan 24, 2019]
3. https://kidshealth.org/en/parents/prenatal-ultrasound.html [accessed on Jan 24, 2019]
4. https://www.webmd.com/baby/ultrasound#1 [accessed on Jan 24, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (16)

High Risk Pregnancy: Ultrasound Services

Video by Swedish/YouTube

Prenatal Ultrasound

Video by Washington State Department of Health/YouTube

Getting A Pregnancy Ultrasound | Kaiser Permanente

Video by Kaiser Permanente Thrive/YouTube

3 Questions to ask at your ultrasound | Boston Children's Hospital

Video by Boston Children's Hospital/YouTube

Obstetric ultrasonography

Ultrasound image of fetus at 14 weeks (profile)

Image by X.Compagnion (cropped by Hidro)

Ultrasound Scan ND 1231102308 1028500

A well defined hypoechoic lesion is seen in choroid plexsus. Choroid plexsus cyst. It may regress automatically. Medical ultrasound image. Provided as-is. Please feel free to categorise, add description, crop.

Image by Nevit Dilmen (talk)

Head-3D

Ultrasound to detect possible kidney cysts

Drawing of female health worker giving an ultrasound examination to a female patient. An ultrasound imaging device passes harmless sound waves through the body to detect possible kidney cysts.

Image by NIDDK Image Library

Drawing of a fetus with an enlarged kidney visible, as seen in an ultrasound. The enlarged kidney is labeled

A prenatal ultrasound can show enlarged kidneys, ureters, or bladders in babies.

Image by NIDDK Image Library

PAPP-A: PAPP-A Screening Tests

The PAPP-A screen is administered as a first-trimester screen integrated with an hCG test and nuchal translucency (NT) ultrasound. The test screens for chromosomal abnormalities such as Down syndrome and trisomy 18. The image featured here shows an ultrasound image of a fetus suspected to have down syndrome. The areas of concern are highlighted in yellow.

Image by TheVisualMD

Obstetric ultrasonography

Medical ultrasound examination of a pregnant woman.

Image by Scott

Megacystis

Megacystis in fetus : Ultrasound revealing megacystis in a fetus with Down syndrome.

Image by X.Compagnion

Fetal Ultrasound

Ultrasound image (sonogram) of a fetus in the womb.

Image by BruceBlaus/Wikimedia

Fetal Ultrasound Excess?

Video by Wall Street Journal/YouTube

Understanding your fetal ultrasound

Video by UTSWMed/YouTube

Fetal Diagnosis of Congenital Diaphragmatic Hernia (CDH) (2 of 11)

Video by The Children's Hospital of Philadelphia/YouTube

2:58

High Risk Pregnancy: Ultrasound Services

Swedish/YouTube

4:00

Prenatal Ultrasound

Washington State Department of Health/YouTube

1:10

Getting A Pregnancy Ultrasound | Kaiser Permanente

Kaiser Permanente Thrive/YouTube

1:26

3 Questions to ask at your ultrasound | Boston Children's Hospital

Boston Children's Hospital/YouTube

Obstetric ultrasonography

X.Compagnion (cropped by Hidro)

Ultrasound Scan ND 1231102308 1028500

Nevit Dilmen (talk)

Head-3D

Ultrasound to detect possible kidney cysts

NIDDK Image Library

Drawing of a fetus with an enlarged kidney visible, as seen in an ultrasound. The enlarged kidney is labeled

NIDDK Image Library

PAPP-A: PAPP-A Screening Tests

TheVisualMD

Obstetric ultrasonography

Scott

Megacystis

X.Compagnion

Fetal Ultrasound

BruceBlaus/Wikimedia

2:46

Fetal Ultrasound Excess?

Wall Street Journal/YouTube

4:54

Understanding your fetal ultrasound

UTSWMed/YouTube

7:36

Fetal Diagnosis of Congenital Diaphragmatic Hernia (CDH) (2 of 11)

The Children's Hospital of Philadelphia/YouTube

Prenatal Cell-Free DNA Screening

Prenatal Cell-Free DNA Screening

Also called: Cell-Free Fetal DNA, cffDNA, cfDNA Screening, Non-Invasive Prenatal Test, NIPT, Non-Invasive Prenatal Screening, NIPS, CfDNA

A prenatal cell-free DNA (cfDNA) screening is a blood test for pregnant people. It checks whether the baby is more likely to have certain chromosome disorders. A cfDNA screening can be done as early as the 10th week of pregnancy.

Prenatal Cell-Free DNA Screening

Also called: Cell-Free Fetal DNA, cffDNA, cfDNA Screening, Non-Invasive Prenatal Test, NIPT, Non-Invasive Prenatal Screening, NIPS, CfDNA

A prenatal cell-free DNA (cfDNA) screening is a blood test for pregnant people. It checks whether the baby is more likely to have certain chromosome disorders. A cfDNA screening can be done as early as the 10th week of pregnancy.

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Use the slider below to see how your results affect your health.
Your result is Negative.
A negative cell-free fetal DNA test result means that it is very unlikely that the baby has trisomy 13, 18, or 21.
Related conditions
Prenatal cell-free DNA (cfDNA) screening is a blood test for pregnant people. During pregnancy, some of the unborn baby's DNA circulates in the pregnant person's bloodstream. A cfDNA screening checks this DNA to find out if the baby is more likely to have certain conditions caused by an abnormal number of chromosomes, such as Down syndrome.
Chromosomes are tiny "packages" in your cells that contain your genes. Genes carry information, called DNA, that controls what you look like and how your body works.
- Normally, you're born with a set of 46 chromosomes in each cell. The chromosomes are grouped into 23 pairs. Each pair has two chromosomes, one coming from each parent.
- If one of these pairs has an extra copy of a chromosome, it's called a trisomy. A trisomy causes changes in the way the body and brain develop.
- If there is an extra copy of chromosome 21, it's called Down syndrome. This is also known as trisomy 21. Down syndrome is the most common chromosome disorder in the United States.
- Other trisomy disorders include Edwards syndrome (trisomy 18), where there is an extra copy of chromosome 18, and Patau syndrome (trisomy 13), where there is an extra copy of chromosome 13. These disorders are rare but more serious than Down syndrome. Most babies with trisomy 18 or trisomy 13 die within the first year of life.
There is very little risk to you and your baby with a cfDNA screening. But a cfDNA screening can't tell you for sure whether your baby has a chromosome disorder. Your health care provider will need to order other tests to confirm or rule out a diagnosis.
Other names: cell-free fetal DNA, cffDNA, non-invasive prenatal test, NIPT, non-invasive prenatal screening, NIPS
A cfDNA screening is most often used to show if your unborn baby has an increased risk for one of the following chromosome disorders:
- Down syndrome (trisomy 21)
- Edwards syndrome (trisomy 18)
- Patau syndrome (trisomy 13)
The screening may also be used to:
- Determine a baby's gender (sex). This may be done if an ultrasound shows that a baby's genitals are not clearly male or female. This may be caused by a disorder of the sex chromosomes.
- Check Rh blood type. Rh is a protein found in red blood cells. If you have the protein, you are considered Rh positive. If you don't, you are Rh negative. If you are Rh negative and your unborn baby is Rh positive, your body's immune system may attack your baby's blood cells. If you find out you are Rh negative early in pregnancy, you can take medicines to protect your baby from dangerous complications.
A cfDNA screening can be done as early as the 10th week of pregnancy.
Many providers recommend this screening to pregnant people who are at higher risk of having a baby with a chromosome disorder. You may be at higher risk if:
- You are age 35 or older. The pregnant person's age is the main risk factor for having a baby with Down syndrome or other trisomy disorders. The risk increases as you get older.
- You've had another baby with a chromosome disorder.
- Your fetal ultrasound didn't look normal.
- Other prenatal test results were not normal.
Many providers recommend screening for all pregnant people. This is because the screening has almost no risk and has a high rate of accuracy.
You and your provider should discuss if a cfDNA screening is right for you.
If your results were negative, it's unlikely that your baby has Down syndrome or another trisomy disorder.
If your results were positive, it means there is an increased risk that your baby has one of these disorders. But it can't tell you for sure if your baby is affected. To confirm a diagnosis, you'll need other tests, such as amniocentesis and chorionic villus sampling (CVS):
- Amniocentesis. This test takes a sample of the amniotic fluid that surrounds the unborn baby in the uterus. The fluid contains cells from the baby that can be tested. The test is usually done between the weeks 15 and 20 of pregnancy.
- Chorionic villus sampling (CVS). A CVS collects tissue from parts of the placenta called the chorionic villi. The placenta is the organ that grows in the uterus to provide nutrients and oxygen to the baby. Cells from the chorionic villi usually have the same chromosomes as the unborn baby. A CVS may be done between weeks 10 and 13 of pregnancy.
These tests are usually very safe procedures, but they do have a slight risk of causing a miscarriage.
If you have questions about your results, talk to your provider and/or a genetic counselor.
1. Cell-Free Fetal DNA. Lab Tests Online. [accessed on Nov 08, 2018]
2. What is noninvasive prenatal testing (NIPT) and what disorders can it screen for? Genetics Home Reference (GHR), U.S. National Library of Medicine [accessed on Nov 08, 2018]
3. Prenatal cell-free DNA screening - Mayo Clinic [accessed on Nov 08, 2018]
4. FAQ: Cell-Free DNA Screening | Patient Education | UCSF Medical Center [accessed on Nov 08, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (23)

Cell free fetal DNA (cffDNA)

Cell free fetal DNA (cffDNA) migrating into the maternal blood stream via the apoptotic trophoblast cells shedding off the placental tissue.

Image by Swils6/Wikimedia

Pinpointing Genes

This illustration explains chromosome staining, inherited markers, and DNA cloning.

Image by National Cancer Institute / Jane Hurd (Illustrator)

DNA Molecule

DNA Molecule

Image by TheVisualMD

Sensitive content

This media may include sensitive content

Liquid biopsy

Tumor cells shed protein and DNA into bloodstream for laboratory analysis and early cancer detection.

Image by Jill George/NIH

Amniocentesis

BruceBlaus

Image by Wikimedia Commons

Human Chorionic Gonadotropin (hCG): hCG Levels Increase Over Time

hCG testing for pregnancy is available to women of child-bearing age. The \"quad\" screen, of which hCG is a component, is especially recommended for women with higher-risk pregnancies as indicated by factors such as maternal age, family history, and disease history. Levels can first be detected by a blood test about 11 days after conception and about 12-14 days after conception by a urine test. In general the hCG levels will double every 72 hours. The level will reach its peak in the first 8-11 weeks of pregnancy and then will decline and level off for the remainder of the pregnancy.

Image by TheVisualMD

Sensitive content

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Chorionic Villus Sampling (CVS)

Chorionic Villus Sampling (CVS) is a prenatal diagnostic test that gathers information about a fetus' health from a sample of chorionic villi cells from the placenta. If a woman is at high risk for a genetic disease, a doctor may recommend CVS to determine whether a baby has certain genetic disorders, such as cystic fibrosis, among other diseases.

Image by TheVisualMD

Prenatal Testing: What to Expect During a First Prenatal Visit

An ultrasound is a simple test during pregnancy that will give your healthcare provider a detailed look at your baby's progress. Learn helpful tips for what to expect and how to stay healthy while pregnant.

Image by TheVisualMD

The Tipsy Test Genebook from BGI

BGI "Genebook", an experimental platform for genetic testing being offered as a perk to the staff. The Tipsy test screens alcohol metabolism genes and gives a score on how well you should be able to metabolise alcohol

Image by Scotted400

Factors affecting penetrance

Factors affecting penetrance

Image by Genomics Education Program

Hipaa Violations by Type

This chart breaks Hipaa Privacy Violations down by the percentage of total violations for each violation type. Based on data available from The U.S Department of Health and Human Services for the period 9/22/2009 to 07/04/2012. Includes the following types: sensitive data disclosed without permision, data compromised by hackers, improper disposal of data, data lost and not accounted for, data physically stolen, and other/unknown. I created this chart in Microsoft Excel 2010 using the information provided on this page of the HHS.gov website. I altered the descriptions used by HHS to make them more descriptive. For example, I changed 'Theft' to 'Data Stolen Physically' as it specifically refers to data that was stolen by physically carying an item out of the place of business.

Image by Compliance and Safety LLC

Methylation of CpG islands in TSG promoters can suppress gene expression and lead to cancer

Methylation of CpG islands in TSG promoters can suppress gene expression and lead to cancer.

Image by WassermanLab

Preimplantation genetic diagnosis

1♂︎—Sperm is collected from a male. 1♀︎—Eggs are collected via in vitro fertilization from a female. 2—The sperm and eggs are fertilized. 3a—The embryos are allowed to develop; those that thrive are given identifiers. 3b—A genetic test is run on each embryo for a given trait and the results are matched with the embryos. 4—The embryos without the desired trait are identified and discarded. 5—The remaining embryos are allowed to grow to the point that they can be implanted. 6a—The embryos with the desired trait are implanted. 6b—The embryos result in a healthy pregnancy. 6c—Fraternal twins with the desired trait, not expressed in their mother, are born.

Image by Psiĥedelisto, Vincent Le Moign, and Nevit Dilmen (User:Nevit)

Genetic discrimination

genetic discrimination

Image by TheVisualMD

Pinpointing Genes in Cancer

This illustration explains about 1) chromosome staining, 2)inherited markers and 3) DNA cloning.

Image by Jane Hurd (Illustrator) / National Cancer Institute (NCI)

Genetic Changes and Cancer

Genes contain information to make proteins, and proteins control many important functions like cell growth. Genetic mutations can change how proteins function. Some types of genetic mutations change proteins in ways that cause healthy cells to become cancerous.

Image by National Cancer Institute (NCI)

Types of Genetic Mutations

Genes contain information to make proteins, and proteins control many important functions like cell growth. Genetic mutations can change how proteins function. Some types of genetic mutations change proteins in ways that cause healthy cells to become cancerous.

Image by National Cancer Institute (NCI)

Prenatal Cell-Free DNA Screening (cfDNA Screening)

Video by Washington State Department of Health/YouTube

Screening in Pregnancy

Video by Michigan Medicine/YouTube

Stanford Hospital's Dr. Jane Chueh on Prenatal Screening and Diagnosis

Video by Stanford Health Care/YouTube

Cell-free DNA Analysis and Cancer Treatment

Video by NEJMvideo/YouTube

Prenatal Screening Options: cfDNA (cell free DNA)

Video by UNC Center for Maternal and Infant Health/YouTube

Cell-Free DNA Prenatal Screen

Video by Mayo Clinic Laboratories/YouTube

Cell free fetal DNA (cffDNA)

Swils6/Wikimedia

Pinpointing Genes

National Cancer Institute / Jane Hurd (Illustrator)

DNA Molecule

TheVisualMD

Sensitive content

This media may include sensitive content

Liquid biopsy

Jill George/NIH

Amniocentesis

Wikimedia Commons

Human Chorionic Gonadotropin (hCG): hCG Levels Increase Over Time

TheVisualMD

Sensitive content

This media may include sensitive content

Chorionic Villus Sampling (CVS)

TheVisualMD

Prenatal Testing: What to Expect During a First Prenatal Visit

TheVisualMD

The Tipsy Test Genebook from BGI

Scotted400

Factors affecting penetrance

Genomics Education Program

Hipaa Violations by Type

Compliance and Safety LLC

Methylation of CpG islands in TSG promoters can suppress gene expression and lead to cancer

WassermanLab

Preimplantation genetic diagnosis

Psiĥedelisto, Vincent Le Moign, and Nevit Dilmen (User:Nevit)

Genetic discrimination

TheVisualMD

Pinpointing Genes in Cancer

Jane Hurd (Illustrator) / National Cancer Institute (NCI)

Genetic Changes and Cancer

National Cancer Institute (NCI)

Types of Genetic Mutations

National Cancer Institute (NCI)

3:54

Prenatal Cell-Free DNA Screening (cfDNA Screening)

Washington State Department of Health/YouTube

5:34

Screening in Pregnancy

Michigan Medicine/YouTube

1:11:38

Stanford Hospital's Dr. Jane Chueh on Prenatal Screening and Diagnosis

Stanford Health Care/YouTube

3:36

Cell-free DNA Analysis and Cancer Treatment

NEJMvideo/YouTube

4:56

Prenatal Screening Options: cfDNA (cell free DNA)

UNC Center for Maternal and Infant Health/YouTube

4:58

Cell-Free DNA Prenatal Screen

Mayo Clinic Laboratories/YouTube

Complete Blood Count

Complete Blood Count

Also called: CBC, Full Blood Count, Blood Cell Count, Hemotology Panel

A complete blood count (CBC) is often part of a routine exam. It is used to measure different parts and features of your blood. A CBC can help detect a variety of disorders including infections, anemia, diseases of the immune system, and blood cancers.

Complete Blood Count

Also called: CBC, Full Blood Count, Blood Cell Count, Hemotology Panel

A complete blood count (CBC) is often part of a routine exam. It is used to measure different parts and features of your blood. A CBC can help detect a variety of disorders including infections, anemia, diseases of the immune system, and blood cancers.

A complete blood count, or CBC, is a blood test that measures many different parts and features of your blood, including:
- Red blood cells, which carry oxygen from your lungs to the rest of your body.
- White blood cells, which fight infections and other diseases. There are five major types of white blood cells. A CBC test measures the total number of white cells in your blood. A different test called a CBC with differential measures the number of each type of these white blood cells.
- Platelets, which stop bleeding by helping your blood to clot.
- Hemoglobin, a protein in red blood cells that carries oxygen from your lungs to the rest of your body.
- Hematocrit, a measurement of how much of your blood is made up of red blood cells.
- Mean corpuscular volume (MCV), a measure of the average size of your red blood cells.
Other names for a complete blood count: CBC, full blood count, blood cell count
Your health care provider may have ordered a complete blood count as part of your checkup or to monitor your overall health. The test may also be used to:
- Help diagnose blood diseases, infection, immune system disorders, or other medical conditions
- Check for changes in an existing blood disorder
A CBC counts the cells in your blood. There are many reasons your levels may not be in the normal range. For example:
- Abnormal levels of red blood cells, hemoglobin, or hematocrit may be a sign of anemia, heart disease, or too little iron in your body.
- Low white cell count may be a sign of an autoimmune disorder, bone marrow disorder, or cancer.
- High white cell count may be a sign of an infection or a reaction to medicine.
If any of your levels are abnormal, it doesn't always mean you have a medical condition that needs treatment. Diet, activity level, medicines, a menstrual period, not drinking enough water, and other factors can affect the results. Talk with your provider to learn what your results mean.
1. Complete Blood Count (CBC): MedlinePlus Medical Test [accessed on Jan 20, 2024]
2. Blood Tests - Blood Tests | NHLBI, NIH. Mar 24, 2022 [accessed on Jan 20, 2024]

Additional Materials (25)

Reticulocyte Count, Hemorrhage/Chronic Blood Loss

Reticulocytes are immature red blood cells (RBCs) released into the bloodstream from the bone marrow in which they developed. Normally, only a tiny percentage red blood cells circulating in the bloodstream are reticulocytes. The reticulocyte count rises, however, when bone marrow is called upon to produce more RBCs, in conditions such as heavy bleeding or certain types of anemia.

Image by TheVisualMD

Blood sample

During the blood collection process, medical personnel gather additional blood samples to test for an array of blood disorders and communicable diseases. Every unit of blood is rigorously tested before approved for transfusion into a patient.

Image by United States Marine Corps

Phlebotomy

Venipuncture (blood draw / collection) in the left arm of a male.

Image by MatthewLammers

Blood and Related Conditions

Blood and Related Conditions : Anemia results when there are too few red blood cells circulating in the bloodstream to deliver adequate oxygen to body tissues. There are different types and causes of anemia, including malnutrition, chronic bleeding, and diseases that result in red blood cells either being destroyed too quickly or produced too slowly.

Image by TheVisualMD

Components of Blood

Components of Blood : Our blood is composed of many different components, the largest categories being red and white blood cells (blood-clotting platelets are another key component) and the liquid portion known as blood plasma. A Complete Blood Count (CBC) includes several of the most basic, yet important, measurements of these components.

Image by TheVisualMD

Blood fractionation

Vial of separated blood. The middle layer is a type of sterile goo which separates the blood from the rest of what's drawn.

Image by Wheeler Cowperthwaite from Reno, USA

Whole Blood

A Red Cross whole blood donation before any separation

Image by Whoisjohngalt

White Blood Cells Rotation

This rotational interactive features five white blood cells. At the top left is a neutrophil (purple nucleus); center is a Monocyte-macrophage (orange nucleus); top right is a Lymphocyte (red nucleus); bottom left a Basophil (green nucleus); and bottom right an Eosinophil (yellow nucleus). These molecules are all part of a white blood cell count test. A white blood cell count is an important measure of this key component of the immune system; when the body is under attack, more WBCs are produced. White blood cells (also called leukocytes or WBCs) are in the front lines in the fight against harmful viruses, bacteria and even fungus. A white blood cell count is an important measure of this key component of the immune system; when the body is under attack, more WBCs are produced. Other factors, however, may also affect WBC counts, including allergies, chemotherapy, and other drugs, as well as leukemia.

Image by TheVisualMD

Medical Checkups

Image by TheVisualMD

Medical Checkups

Most doctors believe that people should have regular checkups as a part of preventive treatment. Regular health exams can help find problems before they begin, or in their early stages, when the chances of successful treatment are best. Blood Pressure Reading: Photo Copyright 2005, James Gathany

Image by TheVisualMD

This browser does not support the video element.

Complete Blood Count, and Baselining Your Health

Video Topics : Our lifeblood consists of many components and a complete blood count (CBC) includes measurements of the fundamental elements. The largest categories are red and white blood cells (RBCs and WBCs) and cell fragments called platelets, which play roles in blood clotting. There are 20-30 trillion red blood cells in the body of an adult, each with a lifespan of about 100 days (RBCs contain an iron-containing protein called hemoglobin that enables them to carry oxygen to tissues throughout the body and then return carbon dioxide to the lungs). WBCs are in the front lines in the body's ongoing fight against harmful viruses, bacteria and even fungus; when a pathogen enters the body, WBCs mobilize in a coordinated defense response to eliminate, neutralize or mark the invader for destruction. The liquid portion of blood is called plasma and it carries nutrients, electrolytes, waste products, and hormones.

Video by TheVisualMD

Full Blood Count – what it tells your doctor about your health

Video by Pathology Tests Explained/YouTube

Complete Blood Count (CBC)

Video by Medicosis Perfectionalis/YouTube

Complete Blood Count

Video by Tom Wade MD/YouTube

high white blood cell count Video

Video by itbestshop/YouTube

Complete Blood Count pt1

Video by Med Immersion/YouTube

Complete Blood Count pt2

Video by Med Immersion/YouTube

This browser does not support the video element.

Normal Red Blood Cell (RBC) Count

An animation simulating a view of a healthy count of red blood cells as viewed in a slide projector or under a microscope. Initially, the screen in white with a circular black vignette along its borders. Then a still showing red blood cells slides up from the bottom left filling the screen and then comes into focus. The red blood cells resemble those taken from an scanning electron micrograph (SEM) and fill up the given space on the screen.

Video by TheVisualMD

This browser does not support the video element.

Anemic Blood Flow

Camera is stationary as it focuses on a capillary in a cell bed demonstrating anemic blood flow and it's lower red blood cell count.

Video by TheVisualMD

This browser does not support the video element.

Anemic Red Blood Cell (RBC) Count

An animation simulating a view of an unhealthy count of red blood cells as viewed in a slide projector or under a microscope. Initially, the screen in white with a circular black vignette along its borders. Then a still showing red blood cells on a light red background slides up from the bottom left filling the screen and then comes into focus. The red blood cells resemble those taken from an scanning electron micrograph (SEM). There are only a few red blood cells in this slide indicative of the low amount typical of some one who is anemic.

Video by TheVisualMD

This browser does not support the video element.

Anemic Red Blood Cell (RBC) Count

An animation simulating a close-up of an unhealthy count of red blood cells as viewed in a slide projector or under a microscope. Initially, the screen in white with a circular black vignette along its borders. Then a still showing red blood cells on a light red background slides up from the bottom left filling the screen and then comes into focus. Throughout the animation, the slide jitters a little. The red blood cells resemble those taken from an scanning electron micrograph (SEM). In this close up there are a few red blood cells along with a few white blood cells.

Video by TheVisualMD

Why Blood Tests Can Save Your Life

Video by Seeker+/YouTube

Introduction to lab values and normal ranges | Health & Medicine | Khan Academy

Video by khanacademymedicine/YouTube

Low blood counts and the risk of infection in cancer patients | Norton Cancer Institute

Video by Norton Healthcare/YouTube

Dr. Erba Describes Proper Diagnostic Testing of CML

Video by OncLiveTV/YouTube

Reticulocyte Count, Hemorrhage/Chronic Blood Loss

TheVisualMD

Blood sample

United States Marine Corps

Phlebotomy

MatthewLammers

Blood and Related Conditions

TheVisualMD

Components of Blood

TheVisualMD

Blood fractionation

Wheeler Cowperthwaite from Reno, USA

Whole Blood

Whoisjohngalt

White Blood Cells Rotation

TheVisualMD

Medical Checkups

TheVisualMD

Medical Checkups

TheVisualMD

2:12

Complete Blood Count, and Baselining Your Health

TheVisualMD

4:18

Full Blood Count – what it tells your doctor about your health

Pathology Tests Explained/YouTube

7:04

Complete Blood Count (CBC)

Medicosis Perfectionalis/YouTube

4:11

Complete Blood Count

Tom Wade MD/YouTube

8:22

high white blood cell count Video

itbestshop/YouTube

16:12

Complete Blood Count pt1

Med Immersion/YouTube

22:14

Complete Blood Count pt2

Med Immersion/YouTube

0:06

Normal Red Blood Cell (RBC) Count

TheVisualMD

0:07

Anemic Blood Flow

TheVisualMD

0:14

Anemic Red Blood Cell (RBC) Count

TheVisualMD

0:14

Anemic Red Blood Cell (RBC) Count

TheVisualMD

8:29

Why Blood Tests Can Save Your Life

Seeker+/YouTube

10:42

Introduction to lab values and normal ranges | Health & Medicine | Khan Academy

khanacademymedicine/YouTube

1:32

Low blood counts and the risk of infection in cancer patients | Norton Cancer Institute

Norton Healthcare/YouTube

2:39

Dr. Erba Describes Proper Diagnostic Testing of CML

OncLiveTV/YouTube

Red Blood Cells

Red Blood Cell (RBC) Count

Also called: Erythrocyte Count, RBC Count, Red Blood Count, Red Blood Cell Count, Red Count

A red blood cell (RBC) count is a blood test that measures the number of red blood cells in your blood. Red blood cells carry oxygen from your lungs to the rest of your body. An abnormal RBC count can be a sign of a serious health problem.

Red Blood Cell (RBC) Count

Also called: Erythrocyte Count, RBC Count, Red Blood Count, Red Blood Cell Count, Red Count

A red blood cell (RBC) count is a blood test that measures the number of red blood cells in your blood. Red blood cells carry oxygen from your lungs to the rest of your body. An abnormal RBC count can be a sign of a serious health problem.

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Use the slider below to see how your results affect your health.
million/μL
3.9
5.5
Your result is Normal.
Red blood cells (RBC) are made in the bone marrow and contain hemoglobin, a protein that carries oxygen to the tissues in the body. RBCs make up approximately 44% of the total blood volume.
Related conditions
You may get this test as part of a CBC, which is often included in a routine checkup. You may also need this test if you are getting treatment that might affect your blood cell counts, such as chemotherapy, to monitor health conditions, such as chronic kidney disease, or if you have symptoms of a low or high red blood cell count.
Symptoms of a low red blood cell count may include:
- Shortness of breath
- Weakness or fatigue
- Headache
- Dizziness
- Arrhythmia (a problem with the rate or rhythm of your heartbeat)
- Pale skin
Symptoms of a high red blood cell count may include:
- Headache
- Dizziness
- Vision problems
Your results will show whether you have a normal red blood cell count or a count that is too low or too high.
Conditions that may cause a low red blood cell count can include:
- Anemia
- Leukemia, a type of blood cancer
- Malnutrition, a condition in which your body does not get the calories, vitamins, and/or minerals needed for good health
- Multiple myeloma, a cancer of the bone marrow
- Kidney failure
- Blood loss from injury or other problems
- Alcohol use disorder (AUD)
- Pregnancy
Conditions that may cause a high red blood cell count can include:
- Dehydration
- Heart disease
- Polycythemia vera, a disease which causes your bone marrow to make too many red blood cells
- Scarring of the lungs, often due to cigarette smoking
- Lung disease
- Kidney cancer
- Sleep apnea, a disorder that causes you to repeatedly stop breathing during sleep
Misuse of certain drugs for athletic performance (such as anabolic steroids) and living at a high altitude can also cause a high red blood cell count.
Talk to your health care provider if you have questions about your results. Your provider will consider your symptoms, medical history, and the results of other blood tests to understand your red blood cell count results.
If results showed you had a low or a high red blood cell count, you may need more tests to help your provider make a diagnosis. These can include:
- Reticulocyte count, which measures the number of reticulocytes in your blood. Reticulocytes are immature (still developing) red blood cells. This test helps check if your bone marrow is making the right amount of red blood cells.
- Iron tests, which measure iron levels in your blood. Iron is essential for making red blood cells.
- Vitamin B test, which measures the amount of one or more B vitamins in your blood. B vitamins are important for making red blood cells and keeping your body healthy.
1. Red Blood Cell (RBC) Count: MedlinePlus Medical Test [accessed on Oct 13, 2024]
2. RBC count: MedlinePlus Medical Encyclopedia [accessed on Jan 19, 2024]
3. Red Blood Cell Count (RBC) Test - Testing.com. Sep 27, 2022 [accessed on Jan 19, 2024]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (19)

Red blood cells

Red blood cells

Image by John Kalekos of Massachusetts image distribution for Science and Learning

Red Blood Cell

This image shows two red blood cells. The red blood cell is also called an erythrocyte: erythro is Greek for \"red,\" cyte is Latin for \"cell.\" The disc-shaped RBCs have the critical job of transporting oxygen from the lungs to the body's cells and bringing carbon dioxide from the cells back to the lungs to be expelled.

Image by TheVisualMD

Red Blood Cell in Capillary

The cardiovascular system is vast network of arteries, veins and vessels that would extend 60,000 miles if stretched end-to-end. All but a tiny fraction of this vessel network is invisible to the naked eye. The smallest capillaries (from latin "hairlike") are so narrow that red blood cells must pass through in single file. Higher than normal blood iron levels have been linked to heart disease and the reason is believed to be the oxidative stress the excess iron places on the walls of the blood vessels. It is the biological counterpart of rust. There are 20-30 trillion red blood cells (RBCs) in an adult's body. The life span of RBCs, which are produced in bone marrow, is about 100 days, which means that 2 million die (and are replaced) each second, but in that short lifetime they can make 75,000 round trips between lungs, heart and tissues in the body.

Image by TheVisualMD

Blood Smear Showing Reduced Red Blood Cell Count

Individual blood cells were first detected and described in the 17th century. Later, red blood cells (RBCs) were counted manually from a blood smear, a thin film of blood prepared on a glass slide and examined under a microscope (blood analysis is now automated, though smears are still used to detect visible abnormalities and to check or confirm the results of other tests). Anemia results when there are too few RBCs in circulation because they are being destroyed too quickly or produced too slowly. Anemia can be temporary or long term and range from mild to severe. Folate (also known as vitamin B9) is necessary for red blood cell production and the prevention of anemia, as well as the metabolism of carbohydrates. But folate also plays key roles in the synthesis and maintenance of DNA and is especially important in cell division and growth in fetal development (deficiencies of the vitamin in pregnancy is a common cause of birth defects). Pernicious anemia is a disorder in which the body's loses its ability to utilize folate and vitamin B12.

Image by TheVisualMD

Red Blood Cell (RBC)

There are 20-30 trillion red blood cells (RBCs) in an adult's body. The life span of RBCs, which are produced in bone marrow, is about 100 days, which means that 2 million die (and are replaced) each second. In their short lifetimes, however, red blood cells can make 75,000 round trips between lungs, heart and tissues in the body.

Image by TheVisualMD

Red Blood Cell

The RBC is disc-shaped and concave on both sides. The concave shape increases the cells' surface area, which allows them to distribute more oxygen to the body's cells. The shape also enables the cells to bunch together more compactly, helping them travel through the bloodstream more efficiently. Some RBCs are a bit thicker or thinner, wider or longer than others, but can change their shape to suit the demands of their environment. The cell membranes of the RBCs are protein meshes that give them flexibility, allowing them to navigate the twists and turns of the blood vessel network. The nearly 300 million hemoglobin molecules contained within each RBC easily move and slide past each other within the cell, adjusting their positions to conform to the RBC's shifting shape. Diameter : 7 μm

Image by TheVisualMD

Capillary Revealing Red Blood Cell

A portion of a capillary wall has been cut away to reveal the red blood cells flowing within.

Image by TheVisualMD

Red Blood Cell and White Blood Cell

Medical visualization of red blood cells and leukocytes.

Image by TheVisualMD

Blood Smear Showing Normal Red Blood Cell Count

Individual blood cells were first detected and described in the 17th century. Later, red blood cells were counted manually from a blood smear, a thin film of blood prepared on a glass slide and examined under a microscope. Blood analysis is now automated, though blood smears are still used to detect visible abnormalities and to check or confirm the results of other tests. There are normally between 4.2-5.8 million red blood cells per microliter (about a drop), which means there are 20-30 trillion red blood cells circulating through the body of an adult.

Image by TheVisualMD

Tubule of Nephron Revealing Many Red Blood Cell

This image shows the cut distal convoluted tubule of nephron with surrounding capillaries cut to reveal many red blood cells and healthy amounts of Erythopoeitin, EPO, (yellow particles). Erythropoeitin, EPO, is produced by the endothelial cells of the capillaries and the fibroblasts in the interstitial tissue surrounding the distal tubules. Normally, the kidneys produce EPO in response to low oxygen levels in order to stimulate red blood cell production in the bone marrow. A normal amount of red blood cells allows for the delivery of an adequate supply of oxygen.

Image by TheVisualMD

Red Blood Cell in Capillary

This image shows red blood cells traveling through capillaries, the smallest blood vessels in the body.

Image by TheVisualMD

Tubule of Nephron Revealing Few Red Blood Cell

Our kidneys are remarkable filters. Each day, they filter about 200 quarts of blood to extract about 2 quarts of wastes, which is then eliminated as urine. The kidneys' delicate filtration units are called nephrons; each kidney has about a million nephrons, and within each nephron are dense forests of tiny capillaries called glomeruli, which remove waste products from the blood while preventing the loss of other components, including proteins, electrolytes and blood cells. The glomerular filtration rate is the amount of blood that is filtered by the glomeruli per minute.

Image by TheVisualMD

This browser does not support the video element.

Complete Blood Count, and Baselining Your Health

Video Topics : Our lifeblood consists of many components and a complete blood count (CBC) includes measurements of the fundamental elements. The largest categories are red and white blood cells (RBCs and WBCs) and cell fragments called platelets, which play roles in blood clotting. There are 20-30 trillion red blood cells in the body of an adult, each with a lifespan of about 100 days (RBCs contain an iron-containing protein called hemoglobin that enables them to carry oxygen to tissues throughout the body and then return carbon dioxide to the lungs). WBCs are in the front lines in the body's ongoing fight against harmful viruses, bacteria and even fungus; when a pathogen enters the body, WBCs mobilize in a coordinated defense response to eliminate, neutralize or mark the invader for destruction. The liquid portion of blood is called plasma and it carries nutrients, electrolytes, waste products, and hormones.

Video by TheVisualMD

Red Blood Cell (RBC) Indices (Anemia Labs)

Video by Nursing School Explained/YouTube

WellnessFX: Red Blood Cell Indices Part 1 with Bryan Walsh

Video by WellnessFX/YouTube

WellnessFX: Red Blood Cell Indices Part 2 with Bryan Walsh

Video by WellnessFX/YouTube

Red Blood Cells Nursing Considerations, Normal Range, Nursing Care, Lab Values Nursing

Video by NURSINGcom/YouTube

This browser does not support the video element.

Flowing Red Blood Cell (RBC)

Animation of red blood cells flowoing quicly through a blood vessel. The camera is positioned in the lumen of the vessel and the rbc's are flowing towards the viewer. The rbc and and lumen are rendered with muted colors to give it a softer look.

Video by TheVisualMD

This browser does not support the video element.

Red Blood Cell Development

This video explains red blood cell development, following a pluripotent stem cell to red blood cell.

Video by TheVisualMD

Red blood cells

John Kalekos of Massachusetts image distribution for Science and Learning

Red Blood Cell

TheVisualMD

Red Blood Cell in Capillary

TheVisualMD

Blood Smear Showing Reduced Red Blood Cell Count

TheVisualMD

Red Blood Cell (RBC)

TheVisualMD

Red Blood Cell

TheVisualMD

Capillary Revealing Red Blood Cell

TheVisualMD

Red Blood Cell and White Blood Cell

TheVisualMD

Blood Smear Showing Normal Red Blood Cell Count

TheVisualMD

Tubule of Nephron Revealing Many Red Blood Cell

TheVisualMD

Red Blood Cell in Capillary

TheVisualMD

Tubule of Nephron Revealing Few Red Blood Cell

TheVisualMD

2:12

Complete Blood Count, and Baselining Your Health

TheVisualMD

7:45

Red Blood Cell (RBC) Indices (Anemia Labs)

Nursing School Explained/YouTube

33:35

WellnessFX: Red Blood Cell Indices Part 1 with Bryan Walsh

WellnessFX/YouTube

28:05

WellnessFX: Red Blood Cell Indices Part 2 with Bryan Walsh

WellnessFX/YouTube

3:01

Red Blood Cells Nursing Considerations, Normal Range, Nursing Care, Lab Values Nursing

NURSINGcom/YouTube

0:12

Flowing Red Blood Cell (RBC)

TheVisualMD

0:31

Red Blood Cell Development

TheVisualMD

White Blood Cells

White Blood Count (WBC)

Also called: WBC, WBC Blood Test, White Blood Count, White Blood Cell Count, Leukocyte Count, Leukopenia Test, Leukocytosis Test, WBC Count

A white blood count measures the number of white cells in your blood. White blood cells are part of the immune system. A count that is too high or too low can indicate an infection, immune system disorder, or another health problem.

White Blood Count (WBC)

Also called: WBC, WBC Blood Test, White Blood Count, White Blood Cell Count, Leukocyte Count, Leukopenia Test, Leukocytosis Test, WBC Count

A white blood count measures the number of white cells in your blood. White blood cells are part of the immune system. A count that is too high or too low can indicate an infection, immune system disorder, or another health problem.

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Use the slider below to see how your results affect your health.
thousand/μL
3.4
10.8
Your result is Normal.
Normally, people produce about 100 billion white blood cells (WBCs) a day.
Related conditions
A white blood count measures the number of white blood cells (WBCs) in your blood. White blood cells, also called leukocytes, are part of your immune system. They are a type of blood cell made in your bone marrow and found in your blood and lymph tissue (part of your immune system). If you are injured or get sick, the white blood cells will travel through your bloodstream and tissues to where they are needed. There, they will help your body fight off infections and other diseases.
When you get sick, your body makes more white blood cells to fight the bacteria, viruses, or other foreign substances causing your illness. This increases your white blood count.
Other diseases can cause your body to make fewer white blood cells than you need. This lowers your white blood count. Diseases that can lower your white blood count include some types of cancer and HIV, a viral disease that attacks white blood cells. Certain medicines, including chemotherapy, may also lower the number of your white blood cells.
There are five major types of white blood cells:
- Neutrophils
- Lymphocytes
- Monocytes
- Eosinophils
- Basophils
A white blood count measures the total number of these cells in your blood. Another test, called a blood differential, measures the amount of each type of white blood cell.
Other names: WBC count, white cell count, white blood cell count, Leukocyte Count, WBC
A white blood count is most often used to help diagnose or monitor disorders related to having a high white blood cell count or low white blood cell count.
Disorders related to having a high white blood count include:
- Autoimmune and inflammatory diseases, conditions that cause the immune system to attack healthy tissues
- Bacterial or viral infections
- Cancers such as leukemia and Hodgkin disease
- Allergic reactions
Disorders related to having a low white blood count include:
- Diseases of the immune system, such as HIV
- Lymphoma, a cancer of the bone marrow
- Diseases of the liver or spleen
A white blood count can show if the number of your white blood cells is too high or too low, but it can't confirm a diagnosis. So it is usually done along with other tests to help confirm your diagnosis. These other tests could include a complete blood count, blood differential, blood smear, and/or bone marrow test.
You may need this test if you have signs of an infection, inflammation, or autoimmune disease. The symptoms of an infection may include:
- Fever
- Chills
- Body aches
- Headache
- Wound that is red, has pus, or won't heal
- Ongoing cough
The symptoms of inflammation and autoimmune diseases will be different, depending on where in the body the inflammation is and the type of disease you have.
You may also need this test if you have a disease that weakens your immune system or are taking medicine that lowers your immune response. If the test shows your white blood count is getting too low, your provider may want to adjust your treatment.
Your newborn or older child may also be tested as part of a routine screening or if they have symptoms of a white blood cell disorder.
Conditions that may cause a high white blood count, also called leukocytosis, include:
- An infection
- An inflammatory disease such as rheumatoid arthritis
- An allergy
- Leukemia or Hodgkin disease
- Tissue damage from a burn injury or surgery
Smoking, stress, a reaction to a medicine, or pregnancy may also cause your body to make more white blood cells, which leads to a high white blood count.
Conditions that may cause a low white blood count, also called leukopenia, include:
- Bone marrow damage. This may be caused by infection, disease, or treatments such as chemotherapy.
- Cancers that affect the bone marrow.
- An autoimmune disorder, such as lupus.
- HIV.
If you are already being treated for a white blood cell disorder, your results may show if your treatment is working or whether your condition has improved.
If you have questions about your results, talk to your provider. Your provider will consider your symptoms, medical history, and the results of other blood tests to understand your white blood count results.
White blood count results are often compared with results of other blood tests, including a blood differential. A blood differential test shows the amount of each type of white blood cell, such as neutrophils or lymphocytes. Neutrophils mostly target bacterial infections. Lymphocytes mostly target viral infections.
- A higher-than-normal amount of neutrophils is known as neutrophilia.
- A lower-than-normal amount is known as neutropenia.
- A higher-than-normal amount of lymphocytes is known as lymphocytosis.
- A lower-than-normal amount is known as lymphopenia.
1. White Blood Count (WBC): MedlinePlus Medical Test [accessed on Aug 08, 2024]
2. WBC count: MedlinePlus Medical Encyclopedia [accessed on Jan 20, 2024]
3. White Blood Cell Count (WBC Blood Test) - Testing.com. Sep 28, 2022 [accessed on Jan 20, 2024]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (37)

White Blood Cell Count: Bone Marrow

Disease or damage to the bone marrow, caused by infection, cancer, radiation treatment, or chemotherapy can lower white blood cell count by impairing the marrow's ability to produce new white blood cells.

Image by TheVisualMD

White Blood Cells, Bone Marrow

Bone marrow is constantly producing blood cells, including white blood cells and red blood cells as well platelets, which are cell fragments important for blood clotting. Disease and disorders of the bone marrow can, in turn, affect the production of blood cells. Both cancer and cancer treatment (chemotherapy and radiation) can also have an impact on the bone marrow's ability to produce blood cells.

Image by TheVisualMD

This browser does not support the video element.

Complete Blood Count, and Baselining Your Health

Video Topics : Our lifeblood consists of many components and a complete blood count (CBC) includes measurements of the fundamental elements. The largest categories are red and white blood cells (RBCs and WBCs) and cell fragments called platelets, which play roles in blood clotting. There are 20-30 trillion red blood cells in the body of an adult, each with a lifespan of about 100 days (RBCs contain an iron-containing protein called hemoglobin that enables them to carry oxygen to tissues throughout the body and then return carbon dioxide to the lungs). WBCs are in the front lines in the body's ongoing fight against harmful viruses, bacteria and even fungus; when a pathogen enters the body, WBCs mobilize in a coordinated defense response to eliminate, neutralize or mark the invader for destruction. The liquid portion of blood is called plasma and it carries nutrients, electrolytes, waste products, and hormones.

Video by TheVisualMD

The Immune System Explained I – Bacteria Infection

Video by Kurzgesagt – In a Nutshell/YouTube

Immune Response to Bacteria

Video by NIAID/YouTube

Immunology - Adaptive Immune System

Video by Armando Hasudungan/YouTube

Immune System - Natural Killer Cell

Video by Kyle Thornthwaite/YouTube

Your Immune System: Natural Born Killer - Crash Course Biology #32

Video by CrashCourse/YouTube

White Blood Cell and Red Blood Cell

Medical visualization of blood cells. Depicted are numerous red blood cells and a single white blood cell.

Image by TheVisualMD

White Blood Cell and Red Blood Cell

Medical visualization of blood cells. Depicted are numerous red blood cells and a single white blood cell.

Image by TheVisualMD

Red Blood Cell and White Blood Cell

Visualization of red blood cells and a white blood cell

Image by TheVisualMD

Blood cells (from left to right: erythrocyte, thrombocyte, leukocyte)

A single drop of blood contains millions of red blood cells, white blood cells, and platelets. One of each type is shown here, isolated from a scanning electron micrograph.

Image by Electron Microscopy Facility at The National Cancer Institute at Frederick (NCI-Frederick)

Bone structure

Anatomy of the bone. The bone is made up of compact bone, spongy bone, and bone marrow. Compact bone makes up the outer layer of the bone. Spongy bone is found mostly at the ends of bones and contains red marrow. Bone marrow is found in the center of most bones and has many blood vessels. There are two types of bone marrow: red and yellow. Red marrow contains blood stem cells that can become red blood cells, white blood cells, or platelets. Yellow marrow is made mostly of fat.

Image by Smart Servier website

Blood Cells

Formed Elements of Blood

Image by Blausen.com staff (2014). \"Medical gallery of Blausen Medical 2014\"

Phagocytosis - C-reactive protein (CRP) is a substance made by the liver that is released into the bloodstream by inflammation and infection as part of the body's immune response.

C-reactive protein (CRP) is a substance made by the liver that is released into the bloodstream by inflammation and infection as part of the body's immune response. White blood cells are also mobilized by the immune system and CRP is believed to enhance the activity of the white blood cells called macrophages. Each type of white blood cell has its own specialized immune functions; macrophages, for example, basically engulf and \"eat\" foreign invaders such as bacteria, viruses and fungi. Macrophages in the spleen and the liver weed out old and defective red blood cells and break them into recyclables (iron, heme, and some globin) and wastes (such as bilirubin). The bilirubin is then used by the liver to produce bile, which is stored in the gallbladder and released into the small intestine to aid digestion.

Image by TheVisualMD

White blood cells

Immune cells surrounding hair follicles in mouse skin. These hair follicles are home to a diverse array of commensal bacteria.

Image by NIAID

Neutrophil

Neutrophil function, relationship to disease, and location in the human body. Credit: NIAID

Image by NIAID

Innate immune system

Image by US Gov

Macrophage Capturing Foreign Antigen

Cell-mediated immunity is an immune response that does not involve antibodies or complement but rather involves the activation of macrophages, natural killer cells (NK), antigen-specific cytotoxic T-lymphocytes, and the release of various cytokines in response to an antigen. Macrophages are white blood cells that engulf and digest cellular debris and pathogens

Image by TheVisualMD

Mast Cell

Mast cells produce histamine. Histamine is known for its role in inflammation. It affects a variety of behavior patterns including the sleep-wake cycle and food intake. Antihistamines may work at odds with inflammation and depression.

Image by TheVisualMD

Leukocytes

Image by OpenStax College

Innate immune system

Illustration of the Innate Immune System responding to injury.

Image by OpenStax College

Eosinophilia

Drawing of an eosinophil white blood cell

Image by Iceclanl

Two neutrophils among many red blood cells. Neutrophils are one type of cell affected by chronic granulomatous disease.

Image by Uploaded by Mgiganteus

Eosinophils

Eosinophil function, relationship to disease, and location in the human body.

Image by NIAID

Sensitive content

This media may include sensitive content

Blood Cells

This is a scanning electron microscope image from normal circulating human blood. One can see red blood cells, several white blood cells including lymphocytes, amonocyte, a neutrophil, and many small disc-shaped platelets. Red cells are nonnucleated and contain hemoglobin, an important protein that contains iron and allows the cell to carry oxygen to other parts of the body. They also carry carbon dioxide away from peripheral tissue to the lungs where it can be exhaled. The infection-fighting white blood cells are classified in two main groups: granular and agranular. All blood cells are formed in the bone marrow. There are two types of agranulocytes: lymphocytes, which fight disease by producing antibodies and thus destroying foreign material, and monocytes. Platelets are tiny cells formed in bone marrow and are necessary for blood clotting.

Image by Bruce Wetzel (photographer). Harry Schaefer (photographer), National Cancer Institute

Immune System and Autoimmune Diseases

Normally, an individual's immune system learns to identify and ignore all of the distinctive little structures found on that individual's own cells. Sometimes, however, it will make a mistake and identify its own body as foreign. If that happens, the immune system produces antibodies that attempt to destroy the body's own cells in the same way it would try to destroy a foreign invader.

Image by TheVisualMD

Eosinophils

Drawing of an eosinophil white blood cell

Image by BruceBlaus

Eosinophils

On the left there is a segmented polymorphonuclear neutrophil, on the right and below is one eosinophil leucocyte. For comparison the red blood cell have a diameter of 7-8 micrometers. The picture was taken with a Nikon Eclipse 600 microscope, magnification was 1000x.

Image by Davidcsaba Dr. David Csaba L.

Neutrophil action - Inflammation

Neutrophil granulocyte migrates from the blood vessel to the matrix, secreting proteolytic enzymes, in order to dissolve intercellular connections (for improvement of its mobility) and envelop bacteria through Phagocytosis.

Image by Uwe Thormann/Wikimedia

Neutrophil

Image by BruceBlaus

White Blood Cells

A type of immune cell. Most white blood cells are made in the bone marrow and are found in the blood and lymph tissue. White blood cells help the body fight infections and other diseases. Granulocytes, monocytes, and lymphocytes are white blood cells.

Image by Blausen.com staff (2014). "Medical gallery of Blausen Medical 2014"

high white blood cell count Video

Video by itbestshop/YouTube

What Are White Blood Cells | Health | Biology | FuseSchool

Video by FuseSchool - Global Education/YouTube

Learning to Decode Your Blood Test Results for Chronic Lymphocytic Leukemia (CLL)

Video by CLL Society/YouTube

WellnessFX: White Blood Cells And Differential with Bryan Walsh

Video by WellnessFX/YouTube

White Blood Count

White Blood Count

Image by TheVisualMD

White Blood Cell Count: Bone Marrow

TheVisualMD

White Blood Cells, Bone Marrow

TheVisualMD

2:12

Complete Blood Count, and Baselining Your Health

TheVisualMD

6:49

The Immune System Explained I – Bacteria Infection

Kurzgesagt – In a Nutshell/YouTube

1:47

Immune Response to Bacteria

NIAID/YouTube

14:59

Immunology - Adaptive Immune System

Armando Hasudungan/YouTube

3:02

Immune System - Natural Killer Cell

Kyle Thornthwaite/YouTube

15:02

Your Immune System: Natural Born Killer - Crash Course Biology #32

CrashCourse/YouTube

White Blood Cell and Red Blood Cell

TheVisualMD

White Blood Cell and Red Blood Cell

TheVisualMD

Red Blood Cell and White Blood Cell

TheVisualMD

Blood cells (from left to right: erythrocyte, thrombocyte, leukocyte)

Electron Microscopy Facility at The National Cancer Institute at Frederick (NCI-Frederick)

Bone structure

Smart Servier website

Blood Cells

Blausen.com staff (2014). \"Medical gallery of Blausen Medical 2014\"

Phagocytosis - C-reactive protein (CRP) is a substance made by the liver that is released into the bloodstream by inflammation and infection as part of the body's immune response.

TheVisualMD

White blood cells

NIAID

Neutrophil

NIAID

Innate immune system

US Gov

Macrophage Capturing Foreign Antigen

TheVisualMD

Mast Cell

TheVisualMD

Leukocytes

OpenStax College

Innate immune system

OpenStax College

Eosinophilia

Iceclanl

Two neutrophils among many red blood cells. Neutrophils are one type of cell affected by chronic granulomatous disease.

Uploaded by Mgiganteus

Eosinophils

NIAID

Sensitive content

This media may include sensitive content

Blood Cells

Bruce Wetzel (photographer). Harry Schaefer (photographer), National Cancer Institute

Immune System and Autoimmune Diseases

TheVisualMD

Eosinophils

BruceBlaus

Eosinophils

Davidcsaba Dr. David Csaba L.

Neutrophil action - Inflammation

Uwe Thormann/Wikimedia

Neutrophil

BruceBlaus

White Blood Cells

Blausen.com staff (2014). "Medical gallery of Blausen Medical 2014"

8:22

high white blood cell count Video

itbestshop/YouTube

3:12

What Are White Blood Cells | Health | Biology | FuseSchool

FuseSchool - Global Education/YouTube

1:17:17

Learning to Decode Your Blood Test Results for Chronic Lymphocytic Leukemia (CLL)

CLL Society/YouTube

16:52

WellnessFX: White Blood Cells And Differential with Bryan Walsh

WellnessFX/YouTube

White Blood Count

TheVisualMD

Platelets

Platelet Count

Also called: Platelets, PLT Count, Platelet Adequacy, Thrombocyte Count, Thrombocytopenia Test, Thrombocytosis Test, Platelet Count

A platelet count test measures the number of platelets in your blood. Platelets, also known as thrombocytes, are small blood cells that are essential for blood clotting. Platelets may be counted to monitor or diagnose diseases, or to look for the cause of too much bleeding or clotting.

Platelet Count

Also called: Platelets, PLT Count, Platelet Adequacy, Thrombocyte Count, Thrombocytopenia Test, Thrombocytosis Test, Platelet Count

A platelet count test measures the number of platelets in your blood. Platelets, also known as thrombocytes, are small blood cells that are essential for blood clotting. Platelets may be counted to monitor or diagnose diseases, or to look for the cause of too much bleeding or clotting.

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Use the slider below to see how your results affect your health.
thousand/μL
50
150
450
Your result is Normal.
A normal platelet count ranges from 150,000 to 450,000 platelets per microliter of blood. Platelets are tiny blood cells that are made in the bone marrow from larger cells. When you are injured, platelets stick together to form a plug to seal your wound. This plug is called a blood clot.
Related conditions
Platelets, also known as thrombocytes, are small blood cells. They form in your bone marrow, the sponge-like tissue in your bones. Platelets are essential for blood clotting. A blood clot is a mass of blood that forms when platelets, proteins, and cells in the blood stick together. When you get hurt, your body forms a blood clot to stop the bleeding.
A platelet count test measures the number of platelets in your blood:
- A lower-than-normal platelet count is called thrombocytopenia. This condition can cause you to bleed too much after a cut or other injury that causes bleeding.
- A higher-than-normal platelet count is called thrombocytosis. This can make your blood clot more than you need it to. Blood clots can be dangerous because they can block blood flow.
Other names: platelet count, PLT, PLT count thrombocyte count
You may need platelet count testing if you have symptoms of having lower-than-normal or higher-than-normal platelets.
Symptoms of lower-than-normal platelets include:
- Bleeding for a long time after a minor cut or injury.
- Nosebleeds.
- Unexplained bruising.
- Pinpoint sized red spots on the skin, known as petechiae.
- Purplish, red, or brown spots on your skin, known as purpura. These may be caused by bleeding under the skin.
- Menstrual periods that have a heavy flow or last a long time.
- Blood in your urine, stool (poop), or from your rectum (where stool passes out of your body).
Symptoms of higher-than-normal platelets include:
- Numbness of hands and feet
- Headache
- Dizziness
- Weakness
- Pain, swelling, and warmth in your lower legs
If your results show a lower-than-normal platelet count (thrombocytopenia), it may be a sign of:
- A cancer that affects the blood, such as leukemia or lymphoma.
- A viral infection, such as mononucleosis, hepatitis, or measles.
- An autoimmune disease. This is a type of disease that causes your body to attack its own healthy tissues, which can include platelets.
- Infection or damage to your bone marrow.
- Cirrhosis.
- Vitamin B12 deficiency (not enough).
- Gestational thrombocytopenia, a common, but mild, low-platelet condition affecting pregnant people. It is not known to cause any harm to a pregnant person or their developing baby. It usually gets better on its own during pregnancy or after birth.
If your results show a higher-than-normal platelet count (thrombocytosis), it may be a sign of:
- Certain types of cancer, such as lung cancer or breast cancer
- Anemia
- Inflammatory bowel disease, such as Crohn's disease and ulcerative colitis
- Rheumatoid arthritis
- A viral or bacterial infection
- Severe blood loss
Your provider may consider your symptoms, medical history, and the results of other blood tests to understand the results of your platelet tests.
1. Platelet Tests: MedlinePlus Medical Test [accessed on Aug 27, 2024]
2. Platelet Count (PLT) Blood Test - Testing.com. Dec 19, 2023 [accessed on Jan 20, 2024]
3. Platelet count: MedlinePlus Medical Encyclopedia [accessed on Jan 20, 2024]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (8)

Platelet Development

Illustration of Platelet Development

Image by OpenStax College

Sensitive content

This media may include sensitive content

Platelet Disorders

From left to right: erythrocyte, thrombocyte, leukocyte

Image by Electron Microscopy Facility at The National Cancer Institute at Frederick (NCI-Frederick)

Scheme of a blood sample after centrifugation

scheme of a blood sample after centrifugation

Image by KnuteKnudsen (talk)

Decode Your Blood Test: Platelets 💉 | Merck Manual Consumer Version

Video by Merck Manuals/YouTube

This browser does not support the video element.

Complete Blood Count, and Baselining Your Health

Video Topics : Our lifeblood consists of many components and a complete blood count (CBC) includes measurements of the fundamental elements. The largest categories are red and white blood cells (RBCs and WBCs) and cell fragments called platelets, which play roles in blood clotting. There are 20-30 trillion red blood cells in the body of an adult, each with a lifespan of about 100 days (RBCs contain an iron-containing protein called hemoglobin that enables them to carry oxygen to tissues throughout the body and then return carbon dioxide to the lungs). WBCs are in the front lines in the body's ongoing fight against harmful viruses, bacteria and even fungus; when a pathogen enters the body, WBCs mobilize in a coordinated defense response to eliminate, neutralize or mark the invader for destruction. The liquid portion of blood is called plasma and it carries nutrients, electrolytes, waste products, and hormones.

Video by TheVisualMD

Platelets Nursing Considerations, Normal Range, Nursing Care, Lab Values Nursing

Video by NURSINGcom/YouTube

Platelets Explained in Two Minutes

Video by American Red Cross/YouTube

The life and times of RBCs and platelets

Video by khanacademymedicine/YouTube

Platelet Development

OpenStax College

Sensitive content

This media may include sensitive content

Platelet Disorders

Electron Microscopy Facility at The National Cancer Institute at Frederick (NCI-Frederick)

Scheme of a blood sample after centrifugation

KnuteKnudsen (talk)

0:48

Decode Your Blood Test: Platelets 💉 | Merck Manual Consumer Version

Merck Manuals/YouTube

2:12

Complete Blood Count, and Baselining Your Health

TheVisualMD

3:54

Platelets Nursing Considerations, Normal Range, Nursing Care, Lab Values Nursing

NURSINGcom/YouTube

1:47

Platelets Explained in Two Minutes

American Red Cross/YouTube

10:35

The life and times of RBCs and platelets

khanacademymedicine/YouTube

Hemoglobin

Hemoglobin Blood Test

Also called: Hemoglobin, Hgb

A hemoglobin test measures the levels of hemoglobin in your blood. Hemoglobin is an iron-rich protein in red blood cells that carries oxygen. Abnormal levels may mean you have anemia or another blood disorder.

Hemoglobin Blood Test

Also called: Hemoglobin, Hgb

A hemoglobin test measures the levels of hemoglobin in your blood. Hemoglobin is an iron-rich protein in red blood cells that carries oxygen. Abnormal levels may mean you have anemia or another blood disorder.

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Use the slider below to see how your results affect your health.
g/dL
13.8
17.2
Your result is Normal.
Heme, an iron-containing molecule, combines with globin proteins to form hemoglobin, which carries oxygen in red blood cells from the lungs to the rest of the body.
Related conditions
Your health care provider may order the test as part of a routine exam, or if you have:
- Symptoms of anemia, which include weakness, dizziness, and cold hands and feet
- A family history of thalassemia, sickle cell anemia, or other inherited blood disorder
- A diet low in iron and other minerals
- A long-term infection
- Excessive blood loss from an injury or surgical procedure
There are many reasons your hemoglobin levels may not be in the normal range.
Low hemoglobin levels may be a sign of:
- Different types of anemia
- Thalassemia
- Iron deficiency
- Liver disease
- Cancer and other diseases
High hemoglobin levels may be a sign of:
- Lung disease
- Heart disease
- Polycythemia vera, a disorder in which your body makes too many red blood cells. It can cause headaches, fatigue, and shortness of breath.
If any of your levels are abnormal, it doesn't always mean you have a medical condition that needs treatment. Diet, activity level, medicines, a menstrual period, and other factors can affect the results. You may also have higher than normal hemoglobin levels if you live in a high altitude area. Talk with your provider to learn what your results mean.
1. Hemoglobin Test: MedlinePlus Medical Test [accessed on Jan 20, 2024]
2. Hemoglobin: MedlinePlus Medical Encyclopedia [accessed on Jan 20, 2024]
3. Hemoglobin - Health Encyclopedia - University of Rochester Medical Center [accessed on Jan 20, 2024]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (16)

Hemoglobin | Human anatomy and physiology | Health & Medicine | Khan Academy

Video by Khan Academy/YouTube

Blood, Part 2 - There Will Be Blood: Crash Course A&P #30

Video by CrashCourse/YouTube

Haemoglobin

Video by Wellcome Trust/YouTube

Hemoglobin A1c & Diabetes

Video by DiabeTV/YouTube

Hemoglobin Molecule

Molecule of hemoglobin.

Image by TheVisualMD

Hemoglobin A1C Molecule

Hemoglobin is a protein found inside red blood cells that carries oxygen from the lungs to cells throughout the body. Hemoglobin also binds with glucose. Diabetics have too much glucose in the bloodstream and this extra glucose binds (or glycates) with hemoglobin. Glycated hemoglobin usually stays glycated for the life of the red blood cell (about 3 months). Therefore, the percentage of hemoglobin that is glycated (measured as A1C) reflects glucose levels that have affected red blood cells up to 3 months in the past. The hemoglobin A1C test measures the percentage of hemoglobin bound to blood sugar (glucose); the test is used to diagnose type 1 and type 2 diabetes. Because the test results reflect average blood sugar levels over a period of 2-3 months (rather than daily fluctuations), the hemoglobin A1C test is also used to gauge how well patients are managing their diabetes over time.

Image by TheVisualMD

Hemoglobin A1C: Red Blood Cells

Red blood cells use the iron-rich protein hemoglobin to carry oxygen from the lungs to cells throughout the body and return carbon dioxide to the lungs. The percentage of hemoglobin bound to blood glucose (hemoglobin A1C) is used to diagnose diabetes.

Image by TheVisualMD

Hemoglobin of Red Blood Cell

Hemoglobin is an iron-containing protein found in red blood cells that binds oxygen and carbon dioxide for transport and delivery to different parts of the body.

Image by TheVisualMD

Hemoglobin Molecule

Hemoglobin is an iron-rich protein that is packed inside RBCs. It is a structurally complex molecule that can change shape to either hold or release oxygen, depending on the body's need. There are close to 300 million hemoglobin molecules within each RBC.

Image by TheVisualMD

Hemoglobin Molecule Heme Group

A heme group in a hemoglobin molecule consists of an iron atom bound equally to four nitrogen atoms, all lying in one plane. The iron atom is the site of oxygen binding.

Image by TheVisualMD

This browser does not support the video element.

Hemoglobin Within Red Blood Cell (RBC)

A red blood cell rushes toward the camera, the camera enters the cell to focus on all of the hemoglobin molecules within

Video by TheVisualMD

Hemoglobin, Carbon Monoxide

Hemoglobin is an iron-containing protein that enables red blood cells to deliver oxygen from the lungs to cells throughout the body. But the same binding site on the hemoglobin molecule has an even stronger affinity for carbon monoxide, which is why we are so susceptible to poisoning by this deadly gas; carbon monoxide grabs all the binding sites and starves the body's tissues of oxygen

Image by TheVisualMD

This browser does not support the video element.

Hemoglobin A1c

The hemoglobin A1c test measures the percentage of hemoglobin bound to blood sugar (glucose); the test is used to diagnose type 1 and type 2 diabetes. Because the test results reflect average blood sugar levels over a period of 2-3 months (rather than daily fluctuations), the hemoglobin A1C test is also used to gauge how well patients are managing their diabetes over time.

Video by TheVisualMD

Hemoglobin A1c

The hemoglobin A1c test measures the percentage of hemoglobin bound to blood sugar (glucose); the test is used to diagnose type 1 and type 2 diabetes. Because the test results reflect average blood sugar levels over a period of 2-3 months (rather than daily fluctuations), the hemoglobin A1C test is also used to gauge how well patients are managing their diabetes over time.

Image by TheVisualMD

Hemoglobin: O2 Binding Hemoglobin

Hemoglobin normally binds to life-sustaining oxygen. But the same binding site on the hemoglobin molecule has an even stronger affinity for carbon monoxide, which is why we are so susceptible to poisoning by this deadly gas.

Image by TheVisualMD

HemoglobinA1C

Hemoglobin Test for O2 Binding Hemoglobin : A hemoglobin test is a measurement of your blood's oxygen-carrying capacity. High levels of hemoglobin can be the result of dehydration, lung disease and other conditions. Low levels of hemoglobin indicate that there is a shortage of red blood cells; this can be the result of RBCs being lost or destroyed too quickly or produced too slowly. Hemoglobin is an iron-containing protein that enables red blood cells to deliver oxygen from the lungs to cells throughout the body. But the same binding site on the hemoglobin molecule has an even stronger affinity for carbon monoxide, which is why we are so susceptible to poisoning by this deadly gas; carbon monoxide grabs all the binding sites and starves the body's tissues of oxygen.

Image by TheVisualMD

14:34

Hemoglobin | Human anatomy and physiology | Health & Medicine | Khan Academy

Khan Academy/YouTube

10:01

Blood, Part 2 - There Will Be Blood: Crash Course A&P #30

CrashCourse/YouTube

5:31

Haemoglobin

Wellcome Trust/YouTube

1:43

Hemoglobin A1c & Diabetes

DiabeTV/YouTube

Hemoglobin Molecule

TheVisualMD

Hemoglobin A1C Molecule

TheVisualMD

Hemoglobin A1C: Red Blood Cells

TheVisualMD

Hemoglobin of Red Blood Cell

TheVisualMD

Hemoglobin Molecule

TheVisualMD

Hemoglobin Molecule Heme Group

TheVisualMD

0:27

Hemoglobin Within Red Blood Cell (RBC)

TheVisualMD

Hemoglobin, Carbon Monoxide

TheVisualMD

0:27

Hemoglobin A1c

TheVisualMD

Hemoglobin A1c

TheVisualMD

Hemoglobin: O2 Binding Hemoglobin

TheVisualMD

HemoglobinA1C

TheVisualMD

Hematocrit

Hematocrit Blood Test

Also called: Hematocrit, HCT, Crit, Packed Cell Volume, PCV

Hematocrit is a blood test that measures how much of a person's blood is made up of red blood cells. Hematocrit levels that are too high or too low can be a sign of a blood disorder, dehydration, or other medical conditions that affect your blood.

Hematocrit Blood Test

Also called: Hematocrit, HCT, Crit, Packed Cell Volume, PCV

Hematocrit is a blood test that measures how much of a person's blood is made up of red blood cells. Hematocrit levels that are too high or too low can be a sign of a blood disorder, dehydration, or other medical conditions that affect your blood.

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Use the slider below to see how your results affect your health.
%
40.7
50.3
Your result is Normal.
Normal hematocrit levels vary based on age and race. In adults, normal levels for men range from 41%-50%. For women, the normal range is slightly lower: 36%-44%.
Related conditions
Your health care provider may order a hematocrit test as part of your regular checkup or to monitor your health if you are being treated for cancer or have an ongoing health condition. Your provider may also order this test if you have symptoms of a red blood cell disorder, such as anemia or polycythemia:
Symptoms of anemia (too few red blood cells) may include:
- Shortness of breath
- Weakness or fatigue
- Headache
- Dizziness
- Arrhythmia (a problem with the rate or rhythm of your heartbeat)
Symptoms of polycythemia (too many red blood cells) may include:
- Headache
- Feeling light-headed or dizzy
- Shortness of breath
- Weakness or fatigue
- Skin symptoms such as itching after a shower or bath, burning, or a red face
- Heavy sweating, especially during sleep
- Blurred or double vision and blind spots
- Bleeding gums and heavy bleeding from small cuts
Your hematocrit test results are reported as a number. That number is the percentage of your blood that's made of red blood cells. For example, if your hematocrit test result is 42, it means that 42% of your blood is red blood cells and the rest is white blood cells, platelets, and blood plasma.
A hematocrit level that's lower than normal may be a sign that:
- Your body doesn't have enough red blood cells (anemia). There are many types of anemia that can be caused by different medical conditions.
- Your body is making too many white blood cells, which may be caused by:
  Bone marrow disease
  Certain cancers, including leukemia, lymphoma, multiple myeloma, or cancers that spread to the bone marrow from other parts of the body
A hematocrit level that's higher than normal may be a sign that:
- Your body is making too many red blood cells, which may be caused by:
  Lung disease
  Congenital heart disease
  Heart failure
  Polycythemia
- Your blood plasma level is too low, which may be caused by:
  Dehydration, the most common cause of a high hematocrit
  Shock
If your results are not in the normal range, it doesn't always mean that you have a medical condition that needs treatment. Living at high altitudes where there's less oxygen in the air may cause a high hematocrit. That's because your body responds to low oxygen levels by making more red blood cells so that you get the oxygen you need.
Pregnancy can cause a low hematocrit. That's because the body has more fluid than normal during pregnancy, which decreases the percentage that's made of red blood cells.
To learn what your test results mean, talk with your provider.
1. Hematocrit Test: MedlinePlus Medical Test [accessed on Jan 20, 2024]
2. Hematocrit: MedlinePlus Medical Encyclopedia [accessed on Jan 20, 2024]
3. Hematrocit Blood Test - Testing.com. Sep 13, 2022 [accessed on Jan 20, 2024]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (30)

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Complete Blood Count, and Baselining Your Health

Video Topics : Our lifeblood consists of many components and a complete blood count (CBC) includes measurements of the fundamental elements. The largest categories are red and white blood cells (RBCs and WBCs) and cell fragments called platelets, which play roles in blood clotting. There are 20-30 trillion red blood cells in the body of an adult, each with a lifespan of about 100 days (RBCs contain an iron-containing protein called hemoglobin that enables them to carry oxygen to tissues throughout the body and then return carbon dioxide to the lungs). WBCs are in the front lines in the body's ongoing fight against harmful viruses, bacteria and even fungus; when a pathogen enters the body, WBCs mobilize in a coordinated defense response to eliminate, neutralize or mark the invader for destruction. The liquid portion of blood is called plasma and it carries nutrients, electrolytes, waste products, and hormones.

Video by TheVisualMD

Vial of Centrifuged Blood

Blood is made up of red and white blood cell (as well as platelets), suspended in a liquid known as blood plasma. Plasma, which makes up 55% of our blood's volume, is a clear liquid (mainly water) that transports food molecules, hormones, waste as well as a wide range of dissolved chemicals. Red cells, which normally make up 40-50% of total blood volume, are produced continuously in our bone marrow at the rate of about 2-3 million cells per second. White cells make up a very small part of blood's volume-normally only about 1% in healthy people. This image shows two vials of centrifuged blood. The left vial shows healthy amount of red blood cells in female (36-44%) ; The right vial shows healthy amount of red blood cells in male (41-50%). The hematocrit (along with the hemoglobin test) is the central test to diagnosing anemia in that it indicates the amount of RBCs in the blood.

Image by TheVisualMD

Red Blood Cells, Bone Marrow

A skeleton may have a dry and lifeless Halloween image, but bone is actually dynamic, living tissue. Bone is not uniformly solid; within its interior is a network of cavities that house blood vessels and marrow. Bone marrow, particularly in larger bones, is where stem cells give rise to red blood cells (erythrocytes) as well as white blood cells (leukocytes) and blood clotting agents (platelets). As the source of blood cells, the bone marrow is critical to health. Disease or damage to bone marrow can result in either too many or too few blood cells.

Image by TheVisualMD

Anemia: Basic lab tests - hematocrit, hemoglobin, reticulocyte, MCV, morphology

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Hematocrit Nursing Considerations, Normal Range, Nursing Care, Lab Values Nursing

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Hematocrit, Dehydration

Blood is composed of cells (primarily red blood cells, but also white blood cells and cell fragments called platelets) along with a liquid portion known as plasma. The ratio of the volume of red blood cells to the volume of plasma is an important health indicator and is known as the hematocrit. The most common cause of a high hematocrit is dehydration, which is usually temporary and easily remedied by increasing fluid intake, thereby restores the balance between RBCs and blood plasma volume.

Image by TheVisualMD

Hematocrit, Anemia

Blood is composed of cells (primarily red blood cells, but also white blood cells and cell fragments called platelets) along with a liquid portion known as plasma. The ratio of the volume of red blood cells to the volume of plasma is an important health indicator and is known as the hematocrit. A low hematocrit usually indicates anemia, which occurs when red blood cells are being either destroyed too quickly or produced too slowly; with fewer red blood cells, less oxygen is delivered to body tissues.

Image by TheVisualMD

Vial of Blood for Hematocrit Test

This image is a vial of blood that has been centrifuged (and thus separated) to determine hematocrit. This vial shows, from top to bottom, 55% plasma, <1% white blood cells, <1% platelets , 45% red blood cells. Hematocrit measures how much of the blood, by volume, is taken up by RBCs. A normal range for hematocrit is 41 to 50 percent in men and 36 to 44 percent in women. In many cases, a reading below the normal range for hematocrit will lead to a diagnosis of CKD-related anemia.This other diagnostic test is the hemoglobin test, which measures the amount of hemoglobin molecules in the blood and is a good indicator of the body's ability to carry oxygen throughout the body.

Image by TheVisualMD

Hematocrit: Bone Marrow

Bone marrow produces about 2 million red blood cells (RBCs) a second to maintain a healthy hematocrit. Many conditions, including kidney disease, chemotherapy, and dietary deficiencies, can reduce RBC production, while others can result in too many RBCs.

Image by TheVisualMD

Hematocrit: Blood Cells

The hematocrit is another way to look at the health of red blood cells (RBCs). Blood is composed of cells (primarily RBCs) and a liquid portion called plasma. The proportions of RBCs and plasma must be kept in balance and this is what the hematocrit measures.

Image by TheVisualMD

Blood

Components of Blood : Blood is mostly made up of plasma and red and white blood cells. But it also contains many other substances as well, like platelets, hormones, nutrients such as glucose, and fats like cholesterol. Blood is the fluid of life, transporting oxygen from the lungs to body tissue and carbon dioxide from body tissue to the lungs.

Image by TheVisualMD

Hematocrit

Hematocrit Blood Vials : If you are at risk for cardiovascular disease, your doctor may order a cholesterol and triglyceride level test as well as a complete blood count (CBC). Abnormal results may be the first clue in determining risk of and in diagnosing cardiovascular disease.

Image by TheVisualMD

Blood Smear Showing Reduced Red Blood Cell Count

Individual blood cells were first detected and described in the 17th century. Later, red blood cells (RBCs) were counted manually from a blood smear, a thin film of blood prepared on a glass slide and examined under a microscope (blood analysis is now automated, though smears are still used to detect visible abnormalities and to check or confirm the results of other tests). Anemia results when there are too few RBCs in circulation because they are being destroyed too quickly or produced too slowly. Anemia can be temporary or long term and range from mild to severe. Folate (also known as vitamin B9) is necessary for red blood cell production and the prevention of anemia, as well as the metabolism of carbohydrates. But folate also plays key roles in the synthesis and maintenance of DNA and is especially important in cell division and growth in fetal development (deficiencies of the vitamin in pregnancy is a common cause of birth defects). Pernicious anemia is a disorder in which the body's loses its ability to utilize folate and vitamin B12.

Image by TheVisualMD

Blood Smear Showing Normal Red Blood Cell Count

Individual blood cells were first detected and described in the 17th century. Later, red blood cells were counted manually from a blood smear, a thin film of blood prepared on a glass slide and examined under a microscope. Blood analysis is now automated, though blood smears are still used to detect visible abnormalities and to check or confirm the results of other tests. There are normally between 4.2-5.8 million red blood cells per microliter (about a drop), which means there are 20-30 trillion red blood cells circulating through the body of an adult.

Image by TheVisualMD

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Red Blood Cells Carry Oxygen

This video focuses on one of the main components of blood, the red blood cell and its function to carry oxygen. The video begins with revealing the red blood cells and the heart that pumps the oxygenated blood to the rest of the body. Hemoglobin is the protein molecule found in these red blood cells that enable blood to transport oxygen. If the blood's capacity to transport oxygen to the tissues is reduced due to a decrease in the number of red blood cells, anemia may occur.

Video by TheVisualMD

Components of Blood

Components of Blood : Our blood is composed of many different components, the largest categories being red and white blood cells (blood-clotting platelets are another key component) and the liquid portion known as blood plasma. A Complete Blood Count (CBC) includes several of the most basic, yet important, measurements of these components.

Image by TheVisualMD

Blood and Related Conditions

Blood and Related Conditions : Anemia results when there are too few red blood cells circulating in the bloodstream to deliver adequate oxygen to body tissues. There are different types and causes of anemia, including malnutrition, chronic bleeding, and diseases that result in red blood cells either being destroyed too quickly or produced too slowly.

Image by TheVisualMD

Pellet of Lymphocyte Cells Created in the Centrifuge

This photograph shows Wendy Watford, Ph.D. holding a test tube containing isolated lymphocyte cells. The cells were spun in a centrifuge to create a pellet at the bottom of the test tube. The cells will be labeled with CFSE dye, which will stain the membranes of the cells. After culturing the cells for three days she will determine the number of cell divisions that have taken place by measuring the dilution of the CFSE dye. The purpose of the work is to measure the proliferation of lymphocytes under various conditions. The principal investigator for this work is John J. O’Shea, M.D., NIAMS Scientific Director.

Image by NIAMS/Photographer: Rhoda Baer

Red Blood Cells

Digital holographic microscopy (DHM) image of red blood cells.

Image by Egelberg (talk)

Test Tube

Between 5,000 and 8,000 blood serum, fecal, urine, viral and respiratory samples arrive six days a week from U.S. Air Force hospitals and clinics worldwide, as well as some other Department of Defense facilities, for analysis at the Epidemiology Laboratory Service, also known as the "Epi Lab" at the 711th Human Performance Wing’s United States Air Force School of Aerospace Medicine and Public Health at Wright Patterson AFB, Ohio.The lab is a Department of Defense reference laboratory offering clinical diagnostic, public health, and force health screening and testing. (U.S. Air Force photo by J.M. Eddins Jr.)

Image by U.S. Air Force photo by J.M. Eddins Jr.

Phlebotomy

This image was uploaded as part of Wiki Loves e-textbooks contest in Poland.

Image by Sean Michael Ragan

Red Blood Cells Carry Oxygen

This video focuses on one of the main components of blood, the red blood cell and its function to carry oxygen. The video begins with revealing the red blood cells and the heart that pumps the oxygenated blood to the rest of the body. Hemoglobin is the protein molecule found in these red blood cells that enable blood to transport oxygen. If the blood's capacity to transport oxygen to the tissues is reduced due to a decrease in the number of red blood cells, anemia may occur.

Image by TheVisualMD

Composition of Blood

Composition of Blood

Image by OpenStax College

Hematology | Hematocrit

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Erythrocyte indices (Hemoglobin, Hematocrit, MCV, MCH & MCHC) What Do These Lab Tests Mean?

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How to Interpret RBC Indices (e.g. hemoglobin vs. hematocrit, MCV, RDW)

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Haematocrit or PCV

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Packed cell volume/ Hematocrit

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Fetal hemoglobin and hematocrit | Human anatomy and physiology | Health & Medicine | Khan Academy

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Smoking, Hematocrit, & Fasting Erythropoietin Concentrations

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Complete Blood Count, and Baselining Your Health

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Vial of Centrifuged Blood

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Red Blood Cells, Bone Marrow

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Anemia: Basic lab tests - hematocrit, hemoglobin, reticulocyte, MCV, morphology

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Hematocrit Nursing Considerations, Normal Range, Nursing Care, Lab Values Nursing

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Hematocrit, Dehydration

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Hematocrit, Anemia

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Vial of Blood for Hematocrit Test

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Hematocrit: Bone Marrow

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Hematocrit: Blood Cells

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Blood

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Hematocrit

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Blood Smear Showing Reduced Red Blood Cell Count

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Blood Smear Showing Normal Red Blood Cell Count

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0:53

Red Blood Cells Carry Oxygen

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Components of Blood

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Blood and Related Conditions

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Pellet of Lymphocyte Cells Created in the Centrifuge

NIAMS/Photographer: Rhoda Baer

Red Blood Cells

Egelberg (talk)

Test Tube

U.S. Air Force photo by J.M. Eddins Jr.

Phlebotomy

Sean Michael Ragan

Red Blood Cells Carry Oxygen

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Composition of Blood

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10:46

Hematology | Hematocrit

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8:32

Erythrocyte indices (Hemoglobin, Hematocrit, MCV, MCH & MCHC) What Do These Lab Tests Mean?

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How to Interpret RBC Indices (e.g. hemoglobin vs. hematocrit, MCV, RDW)

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6:14

Haematocrit or PCV

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Packed cell volume/ Hematocrit

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Fetal hemoglobin and hematocrit | Human anatomy and physiology | Health & Medicine | Khan Academy

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Smoking, Hematocrit, & Fasting Erythropoietin Concentrations

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MCV

MCV (Mean Corpuscular Volume) Test

Also called: MCV, MCV Blood Test, Mean Corpuscular Volume, Mean RBC Volume

A mean corpuscular volume (MCV) blood test measures the size of your red blood cells. If blood cells are too small or too large, it may indicate a blood disorder.

MCV (Mean Corpuscular Volume) Test

Also called: MCV, MCV Blood Test, Mean Corpuscular Volume, Mean RBC Volume

A mean corpuscular volume (MCV) blood test measures the size of your red blood cells. If blood cells are too small or too large, it may indicate a blood disorder.

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Use the slider below to see how your results affect your health.
fL
76
96
Your result is Normal.
A normal MCV indicates that the red blood cells are normal average size, or normocytic. Normal results vary based on the laboratory and the method used.
Related conditions
Your health care provider may order a complete blood count, which includes an MCV test, as part of your regular checkup. You may also have the test if you have a chronic (long-lasting) condition that could lead to anemia or if you have the symptoms of anemia:
- Shortness of breath
- Weakness or fatigue
- Headache
- Dizziness
- Arrhythmia (a problem with the rate or rhythm of your heartbeat)
An MCV test alone cannot diagnose any disease. Your provider will use the results of your MCV, other test results, and your medical history to make a diagnosis.
If your results show that your red blood cells are smaller than normal, it may be a sign of:
- Certain types of anemia, including iron-deficiency anemia, the most common type
- Thalassemia, an uncommon genetic condition
If your results show that your red blood cells are larger than normal, it may be a sign of:
- Pernicious anemia, which may be caused by:
  A lack of vitamin B12
  A disease that affects your body's ability to use vitamin B12, such as certain autoimmune diseases, celiac disease, or Crohn's disease.
- Anemia caused by a lack of folic acid
- Liver disease
It's also possible to have anemia with a normal MCV. This may happen if anemia is caused by conditions, such as:
- A sudden loss of blood
- Kidney failure
- Aplastic anemia (uncommon)
If your MCV levels are not in the normal range, it doesn't always mean that you have a medical problem that needs treatment. Diet, activity level, medicines, a menstrual period, and other conditions can affect the test results. Talk with your health care provider to learn what your results mean.
1. MCV (Mean Corpuscular Volume): MedlinePlus Medical Test [accessed on Jan 20, 2024]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (22)

Microcytic, normocytic, and macrocytic anemias | NCLEX-RN | Khan Academy

Video by khanacademymedicine/YouTube

Non-megaloblastic Macrocytic Anemia

Video by Medicosis Perfectionalis/YouTube

Microcytic anemia | Hematologic System Diseases | NCLEX-RN | Khan Academy

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Living with and Managing Iron-Deficiency Anemia

Video by NHLBI/YouTube

Hemolytic Anemia

Video by DrER.tv/YouTube

Medical School - Anemia Made Easy

Video by iMedicalSchool/YouTube

Iron deficency anemia diagnosis | Hematologic System Diseases | NCLEX-RN | Khan Academy

Video by khanacademymedicine/YouTube

RBC Indices

Video by Pathology Simplified/YouTube

Anemia: Basic lab tests - hematocrit, hemoglobin, reticulocyte, MCV, morphology

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WellnessFX: Red Blood Cell Indices Part 1 with Bryan Walsh

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WellnessFX: Red Blood Cell Indices Part 2 with Bryan Walsh

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Blood Brain Barrier Endothelium

The blood-brain barrier keeps potentially toxic substances from entering the brain. The semipermeable membrane formed by the tightly spaced cells of capillaries in this area selectively screens out large molecules, while permitting the transport of essential nutrients such as glucose. The endothelium is the cellular lining of the blood vessel and is made up of endothelial cells connected to one another by tight junctions. These are the strongest cell-to-cell adhesions in the body. Toxic materials being transported in the blood are too large to pass through these junctions and exit the blood. Therefore, the brain is protected from exposure to many harmful substances. The barrier is does not, however, prevent fat-soluble materials from entering the brain; this includes alcohol and nicotine.

Image by TheVisualMD

Normal Blood Glucose Levels in Capillary

This image depicts a healthy capillary with normal glucose (pink) and insulin (yellow) levels. Capillaries, the smallest blood vessels in your body, are where nutrients are transferred from blood to cells, and waste from cells to blood. The body's cells depend on sugar in the blood, which is derived from carbohydrates, for food and energy. Allowing for the innumerable differences among individuals, the threshold for a normal blood-sugar (glucose) level in healthy people is 100 mg/dL; that is, 100 milligrams of glucose per deciliter of blood. Lower-than-normal levels characterize hypoglycemia and higher than normal levels characterize hyperglycemia.

Image by TheVisualMD

Cross-Section of Healthy Capillary Blood Vessel with Normal Glucose and Insulin Levels

This image depicts a healthy capillary. Capillaries are the smallest blood vessels in your body and are where the transfer of nutrients from blood to cells and wastes from cells to the blood takes place.The cells of the body depend on sugar in the blood, derived from carbohydrates, for food and energy. Allowing for the innumerable differences among individuals, the threshold for a normal blood-sugar (glucose) level in healthy people is 100 mg/dL; that is, 100 milligrams of glucose per deciliter of blood. Lower-than-normal levels characterize hypoglycemia and higher than normal levels hyperglycemia.

Image by TheVisualMD

Blood Vessels in the Brain

The Blood Brain Barrier and Astrocytes type 1

Image by Ben Brahim Mohammed

Cross-Section of Damaged Capillary Blood Vessel with Very High Glucose and Insulin Levels

This image depicts an unhealthy, damaged capillary with very high levels of insulin and glucose. Capillaries, the smallest blood vessels in your body, are where nutrients are transferred from blood to cells, and waste from cells to the blood The body's cells depend on sugar (glucose) in the blood, which is derived from carbohydrates, for food and energy. Without insulin, glucose is not able to enter cells to be used as fuel. Allowing for the innumerable differences among individuals, the threshold for a normal blood-sugar (glucose) level in healthy people is 100 mg/dL; that is, 100 milligrams of glucose per deciliter of blood. Higher than normal levels lead to hyperglycemia. Hyperglycemia is the hallmark of prediabetes (between 100 and 125 mg/dL) and diabetes (126 mg/dL and higher). It is caused by either too little insulin being released by the pancreas or the body's inability to use insulin properly. Hyperglycemia leads to microangiopathy, marked by endothelial cell apoptosis (programmed cell death), accumulation of AGEs (advanced glycation end products), and thickening of the basement membrane, which can lead to development of lesions, vasoconstriction, and altered vessel function

Blood Components

This image highlights the vital components of blood: 55% plasma Plasma is the liquid river that transports every blood cell to its destination. Oxygen-carrying RBCs couldn't move through arteries, veins and capillaries without it. Even though it is a watery, almost clear fluid, plasma contains many important substances, including blood-clotting agents called platelets and protective proteins called antibodies which help us fight infection. When the clotting agents are removed from blood plasma, it is called serum, which is essential in many life-saving medical situations such as transplant surgery and trauma. <1% white blood cells (wbcs or leukocytes) Some leukocytes are produced in the bone marrow, while others are generated in lymph nodes scattered throughout the body. They are far less numerous than their sister RBCs, but leukocytes are the bedrock of the immune system and are the body's front line of defense. Different types of leukocytes fight infections in different ways. Some target bacterial or fungal infections, while others respond to parasitic threats or allergic reactions. <1% platelets Platelets perform the vital function of clotting blood at wound sites. They are small, even in comparison to the other cells of your blood, but they pack a wallop when it comes to healing a scrape or staunching a more serious wound. When you cut yourself shaving, platelets arrive on the scene like your personal emergency medical team, creating a natural bandage of clotted blood, which eventually forms a scab. 45% red blood cells rbcs or erythrocytes) RBCs are produced in the bone marrow and perform the fundamental task of delivering oxygen to all of the body's cells. The vial is an example of the hematocrit, one of many tests that make up the complete blood count (CBC). Hematocrit measures the volume of RBCs in your blood. A normal hematocrit reading for women is between 36 to 44 percent; for men it's 41 to 50 percent.

Image by TheVisualMD

Test Tube Containing Blood

Visualization of a test tube containing blood. Blood comprises of 55% plasma, 1% platelets and white blood cells, and 45% red blood cells.

Image by TheVisualMD

Blood Smear Showing Reduced Red Blood Cell Count

Individual blood cells were first detected and described in the 17th century. Later, red blood cells (RBCs) were counted manually from a blood smear, a thin film of blood prepared on a glass slide and examined under a microscope (blood analysis is now automated, though smears are still used to detect visible abnormalities and to check or confirm the results of other tests). Anemia results when there are too few RBCs in circulation because they are being destroyed too quickly or produced too slowly. Anemia can be temporary or long term and range from mild to severe. Folate (also known as vitamin B9) is necessary for red blood cell production and the prevention of anemia, as well as the metabolism of carbohydrates. But folate also plays key roles in the synthesis and maintenance of DNA and is especially important in cell division and growth in fetal development (deficiencies of the vitamin in pregnancy is a common cause of birth defects). Pernicious anemia is a disorder in which the body's loses its ability to utilize folate and vitamin B12.

Image by TheVisualMD

Red Blood Cell in Capillary

The cardiovascular system is vast network of arteries, veins and vessels that would extend 60,000 miles if stretched end-to-end. All but a tiny fraction of this vessel network is invisible to the naked eye. The smallest capillaries (from latin "hairlike") are so narrow that red blood cells must pass through in single file. Higher than normal blood iron levels have been linked to heart disease and the reason is believed to be the oxidative stress the excess iron places on the walls of the blood vessels. It is the biological counterpart of rust. There are 20-30 trillion red blood cells (RBCs) in an adult's body. The life span of RBCs, which are produced in bone marrow, is about 100 days, which means that 2 million die (and are replaced) each second, but in that short lifetime they can make 75,000 round trips between lungs, heart and tissues in the body.

Image by TheVisualMD

Kidney and Stem Cell Creating Red Blood Cell. B12 is critical for the creation of red blood cells.

We are used to thinking of our kidneys mostly as hardworking filters that rid our bodies of wastes and excess water. But the kidneys are also constantly monitoring and adjusting levels of key substances in the blood, depending on what the body needs. Specialized cells in the kidney that are very sensitive to low oxygen levels, for example, produce a hormone called erythropoietin (EPO), which in turn promotes the production of red blood cells in the bone marrow. The boost in red blood cells increases the oxygen-carrying capacity of the blood.

Image by TheVisualMD

Healthy Capillary Blood Vessel

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Healthy Capillary Blood Vessel and and Damaged Capillary Blood Vessel Caused by High Levels of Blood Glucose

1) Healthy Capillary Blood Vessel - This image depicts a healthy capillary. Capillaries are the smallest blood vessels in your body. They can be so thin in diameter that blood cells have to bend in order to pass through. Capillaries are where the transfer of nutrients from the blood to cells, and the transfer of waste from cells to blood, takes place. In a healthy body, the blood vessels are smooth and elastic. 2) Cross-Section of Healthy Capillary Blood Vessel with Normal Glucose and Insulin Levels - This image depicts a healthy capillary. The body's cells depend on sugar in the blood, which is derived from carbohydrates, for food and energy. Allowing for the innumerable differences among individuals, the threshold for a normal blood sugar (glucose, pink) level in healthy people is 100 mg/dL; that is, 100 milligrams of glucose per deciliter of blood. Lower-than-normal levels characterize hypoglycemia and higher-than-normal levels characterize hyperglycemia. Without insulin (yellow), glucose is not able to enter cells to be used as fuel. Because of this, healthy insulin levels are a key factor in keeping blood glucose levels normal. 3) Cross-Section of Damaged Capillary Blood Vessel with Very High Glucose and Insulin Levels - This image depicts an unhealthy, damaged capillary with very high levels of insulin and glucose. Higher than normal levels of blood glucose lead to hyperglycemia. Hyperglycemia is the hallmark of prediabetes (between 100 and 125 mg/dL) and diabetes (126 mg/dL and higher). It is caused by either too little insulin being released by the pancreas or the body's inability to use insulin properly. Hyperglycemia leads to microangiopathy, marked by endothelial cell apoptosis (programmed cell death), accumulation of AGEs (advanced glycation end products), and thickening of the basement membrane, which can lead to the development of lesions, vasoconstriction, and altered vessel function

Interactive by TheVisualMD

5:57

Microcytic, normocytic, and macrocytic anemias | NCLEX-RN | Khan Academy

khanacademymedicine/YouTube

4:39

Non-megaloblastic Macrocytic Anemia

Medicosis Perfectionalis/YouTube

9:42

Microcytic anemia | Hematologic System Diseases | NCLEX-RN | Khan Academy

khanacademymedicine/YouTube

3:56

Living with and Managing Iron-Deficiency Anemia

NHLBI/YouTube

3:24

Hemolytic Anemia

DrER.tv/YouTube

3:16

Medical School - Anemia Made Easy

iMedicalSchool/YouTube

9:54

Iron deficency anemia diagnosis | Hematologic System Diseases | NCLEX-RN | Khan Academy

khanacademymedicine/YouTube

9:02

RBC Indices

Pathology Simplified/YouTube

4:32

Anemia: Basic lab tests - hematocrit, hemoglobin, reticulocyte, MCV, morphology

retic20/YouTube

33:35

WellnessFX: Red Blood Cell Indices Part 1 with Bryan Walsh

WellnessFX/YouTube

28:05

WellnessFX: Red Blood Cell Indices Part 2 with Bryan Walsh

WellnessFX/YouTube

Blood Brain Barrier Endothelium

TheVisualMD

Normal Blood Glucose Levels in Capillary

TheVisualMD

Cross-Section of Healthy Capillary Blood Vessel with Normal Glucose and Insulin Levels

TheVisualMD

Blood Vessels in the Brain

Ben Brahim Mohammed

Cross-Section of Damaged Capillary Blood Vessel with Very High Glucose and Insulin Levels

Blood Components

TheVisualMD

Test Tube Containing Blood

TheVisualMD

Blood Smear Showing Reduced Red Blood Cell Count

TheVisualMD

Red Blood Cell in Capillary

TheVisualMD

Kidney and Stem Cell Creating Red Blood Cell. B12 is critical for the creation of red blood cells.

TheVisualMD

Healthy Capillary Blood Vessel and and Damaged Capillary Blood Vessel Caused by High Levels of Blood Glucose

TheVisualMD

Glucose in Urine Test

Glucose in Urine Test

Also called: Urine sugar test, Urine glucose test, Glucosuria test, Glucose urine dipstick

A glucose in urine test measures the amount of glucose (sugar) in your urine. The test is used to monitor both type 1 and type 2 diabetes.

Glucose in Urine Test

Also called: Urine sugar test, Urine glucose test, Glucosuria test, Glucose urine dipstick

A glucose in urine test measures the amount of glucose (sugar) in your urine. The test is used to monitor both type 1 and type 2 diabetes.

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Use the slider below to see how your results affect your health.
mg/dL
15
Your result is Negative.
Glucose is not usually found in urine. If it is, further testing is needed.
Related conditions
You may get a glucose in urine test as part of your regular checkup or if you have symptoms of diabetes and cannot take a blood glucose test. Symptoms of diabetes include:
- Increased thirst
- More frequent urination
- Blurred vision
- Fatigue
You may also need a urinalysis, which includes a glucose in urine test, if you are pregnant. If high levels of glucose in urine are found, it may indicate gestational diabetes. Gestational diabetes is form of diabetes that happens only during pregnancy. Blood glucose testing can be used to confirm a diagnosis of gestational diabetes. Most pregnant women are tested for gestational diabetes with a blood glucose test, between their 24th and 28th weeks of pregnancy.
If your urine glucose test is part of a urinalysis, you will need to provide a sample of your urine. During your office visit, you will receive a container in which to collect the urine and special instructions to ensure the sample is sterile. These instructions are often referred to as the "clean catch method." The clean catch method includes the following steps:
1. Wash your hands.
2. Clean your genital area with a cleansing pad. Men should wipe the tip of their penis. Women should open their labia and clean from front to back.
3. Start to urinate into the toilet.
4. Move the collection container under your urine stream.
5. Collect at least an ounce or two of urine into the container, which should have markings to indicate the amount.
6. Finish urinating into the toilet.
7. Return the sample container as instructed by your health care provider.
Your health care provider may ask you to monitor your urine glucose at home with a test kit. He or she will provide you with either a kit or a recommendation of which kit to buy. Your urine glucose test kit will include instructions on how to perform the test and a package of strips for testing. Be sure to follow the kit instructions carefully, and talk to your health care provider if you have any questions.
Glucose is not normally found in urine. If results show glucose, it may be a sign of:
- Diabetes
- Pregnancy. As many half of all pregnant women have some glucose in their urine during pregnancy. Too much glucose may indicate gestational diabetes.
- A kidney disorder
A urine glucose test is only a screening test. If glucose is found in your urine, your provider will order a blood glucose test to help make a diagnosis.
1. https://medlineplus.gov/lab-tests/glucose-in-urine-test/ [accessed on Sep 15, 2019]
2. https://medlineplus.gov/ency/article/003581.htm [accessed on Sep 15, 2019]
3. https://www.labcorp.com/test-menu/26061/glucose-quantitative-urine [accessed on Sep 15, 2019]
4. https://www.urmc.rochester.edu/encyclopedia/content.aspx?ContentTypeID=167&ContentID=glucose_urine [accessed on Sep 15, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (6)

Abdomen Revealing Pancreas and Kidney

Sugar is one of the nutrients your body uses for energy. It is the product of the body's breakdown of complex carbohydrates and is circulated in the blood to all your cells. Although blood sugar levels change depending on whether you just ate or exercised, in general, your body keeps the sugar levels within a narrow range. Not enough sugar - hypoglycemia - and you can get hungry, shaky, sweaty, tired, and even faint. Too much sugar - hyperglycemia - is a cardiovascular risk factor leading to arteriosclerosis (hardening of the arteries). To control blood sugar levels, your body depends on a hormone called insulin.

Image by TheVisualMD

Diabetes Symptoms

(left to right) Fatigue: dehydration, lack of ability to utilize glucose for energy and other factors cause fatigue; weight loss: because it can't use glucose for energy, the body breaks down muscle instead; constant hunger: diabetes prevents glucose from entering cells, leading to constant hunger due to cell starvation; increased thirst: too much urination leaves tissues dehydrated and causes increased thirst; frequent urination: fluids are drawn from tissues and the kidneys constantly filter out glucose, leading to frequent urination.

Image by TheVisualMD

Male Figure with Urinary System

Both the male and the female urinary tracts are made up of the kidneys, ureters, urethra, and bladder.The kidneys filter wastes and water from the blood to produce urine. From the kidneys, urine passes through tubes called ureters to the bladder, which stores urine until it is full. Urine exits the bladder through another tube, the urethra. The male and female urinary tracts are relatively the same except for the length of the urethra: the male urethra is about five times as long as the female urethra.

Image by TheVisualMD

Kidney Glomeruli, Compromised Filtration

Our kidneys are remarkable filters. Each day, they filter about 200 quarts of blood to extract about 2 quarts of wastes, which are then eliminated as urine. Proteins are also normally filtered out of the blood and recycled in the body by the kidneys. When kidneys are diseased or damaged, however, their ability to filter out proteins is compromised, which allows protein to then leak into urine.

Image by TheVisualMD

Diseased and Aging Kidney Tissue Comparisons

As a person ages, the number of nephrons, the kidneys' vital filters, decreases, as does the overall amount of tissue in the kidneys. A healthy aging kidney will not function like a 20-year-old kidney, but it can still do its job. The difference between an aging kidney in a healthy body and a kidney damaged by hypertension or diabetes can be as stark as the difference between someone who is a picture of health and someone who is debilitated by illness.

Image by TheVisualMD

Glomerulonephritis

Our kidneys filter about 200 quarts of blood each day to extract about 2 quarts of waste, which is then eliminated as urine. The kidneys' delicate filtration units are called nephrons; each kidney has about a million nephrons, and within each nephron are dense forests of tiny capillaries called glomeruli. Glomerulonephritis is the inflammation of these tiny filters and can be caused by diabetes and chronic high blood pressure or, in acute cases, infection. When kidney function declines, waste products normally filtered out and excreted into the urine begin instead to accumulate in the blood.

Image by TheVisualMD

Abdomen Revealing Pancreas and Kidney

TheVisualMD

Diabetes Symptoms

TheVisualMD

Male Figure with Urinary System

TheVisualMD

Kidney Glomeruli, Compromised Filtration

TheVisualMD

Diseased and Aging Kidney Tissue Comparisons

TheVisualMD

Glomerulonephritis

TheVisualMD

First Trimester Screen

First Trimester Screen

Also called: First Trimester Maternal Screen Panel, Nuchal Translucency Test with Maternal Blood Test, First Trimester Combined Screening

A first trimester screen measures two pregnancy-related hormones, human chorionic gonadotropin (hCG), and PAPP-A. Then, the results of these two blood tests are compared with the results of a fetal ultrasound and combined into one number that shows your likelihood of having a baby with a genetic abnormality. It's called a first trimester screen because...

First Trimester Screen

Also called: First Trimester Maternal Screen Panel, Nuchal Translucency Test with Maternal Blood Test, First Trimester Combined Screening

A first trimester screen measures two pregnancy-related hormones, human chorionic gonadotropin (hCG), and PAPP-A. Then, the results of these two blood tests are compared with the results of a fetal ultrasound and combined into one number that shows your likelihood of having a baby with a genetic abnormality. It's called a first trimester screen because...

A first trimester screen comprises several tests that are done during the first three months of pregnancy in order to detect how high is your baby's risk of having chromosomal disorders (including Down syndrome and trisomy 18) and other problems such as heart defects.
1. https://www.mayoclinic.org/tests-procedures/first-trimester-screening/about/pac-20394169 [accessed on Jan 24, 2019]
2. http://americanpregnancy.org/prenatal-testing/first-trimester-screen/ [accessed on Jan 24, 2019]
3. https://www.stanfordchildrens.org/en/topic/default?id=first-trimester-screening-90-P08568 [accessed on Jan 24, 2019]
4. https://labtestsonline.org/tests/first-trimester-screening [accessed on Jan 24, 2019]

Pregnancy-Associated Plasma Protein-A Test

Pregnancy-Associated Plasma Protein-A Test

Also called: PAPP-A

The pregnancy-associated plasma protein-A (PAPP-A) is a protein that is normally produced by the placenta during pregnancy. This test measures the levels of this protein, which can be used to help screen for pregnancy complications and chromosomal abnormalities in the fetus.

Pregnancy-Associated Plasma Protein-A Test

Also called: PAPP-A

The pregnancy-associated plasma protein-A (PAPP-A) is a protein that is normally produced by the placenta during pregnancy. This test measures the levels of this protein, which can be used to help screen for pregnancy complications and chromosomal abnormalities in the fetus.

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Use the slider below to see how your results affect your health.
0.5
Your result is Normal.
Your PAPP-A levels are normal, which means that this result alone is not expected to negatively impact a pregnancy or fetal health.
Related conditions
The objective of this test along with the other first-trimester screening tests is to identify a pregnant woman’s risk of having a baby with chromosomal abnormalities such as Down syndrome and Edwards syndrome.
The PAPP-A tets can also be used to assess the risk of premature birth, stillbirth, and other pregnancy complications.
Your doctor may recommend this test if:
- You have a history of fetal abnormalities
- Familiar genetic conditions
- To assess the risk of chromosome abnormalities in the fetus
1. Pregnancy-associated plasma protein-A - Embryology [accessed on Nov 14, 2018]
2. Pregnancy-associated plasma protein A (PAPP-A) and preeclampsia. - PubMed - NCBI [accessed on Nov 14, 2018]
3. First Trimester Screening [accessed on Nov 14, 2018]
4. 1STT - Clinical: First Trimester Maternal Screen [accessed on Nov 14, 2018]
5. Variation of Papp-A Level in the First Trimester of Pregnancy and Its Clinical Outcome [accessed on Nov 14, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (34)

Embryo 36 Day Old (Week 7 for Gestational Age) Brain and Cardiovascular System

Computer Generated Image from Micro-MRI, actual size of embryo = 6.0 mm. This image offers a right-sided perspective of the internal organ development of an embryo at the beginning of six weeks. The age is calculated from the day of fertilization. Of the prominent organs displayed are those of the cardiovascular system which continue to develop at a rapid rate during this phase. The heart (seen here as somewhat shadowed red rounded structure in the medial aspect of the embryo) is the first functional organ to develop in the human embryo. The heart begins its existence as two simple tubes that quickly fuse to form a single chamber or heart tube that is busily pumping blood by the 23nd day. At around the 25th day, it exhibits four slightly bulged areas that represent the earliest heart chambers called sinus venosus, atrium, ventricle, bulbous cordis. During the next three weeks of development, the heart tube undergoes dramatic contortions so as to change its structure to become a four-chambered organ capable of acting as a double pump. This image depicts the heart at the 36th day of development. The tubes have undergone the aforementioned changes and the heart is divided into its four definitive chambers. They will assume their adult positions in just one more month. By the fourth week of development, the heart is pumping blood through the rudimentary vascular system. In the eye region (as represented by a red dot surrounded by a green ring) the lens is almost completely closed and are starting to undergo retinal pigmentation. The brain is also undergoing rapid differentiation as the irregularly shaped vesicles continue to form. The prominent uppermost bump in this image represents the future cerebellum. Continual development in the brain will bring about three major components, the forebrain, midbrain, and hindbrain.

Image by TheVisualMD

Embryo 36 Day Old (Week 7 for Gestational Age) External and Internal Anatomy

Computer Generated Image from Micro-MRI, actual size of embryo = 6.0 mm. These images offer several perspectives of the internal and external development of an embryo at the beginning of six weeks. The age is calculated from the day of fertilization. The upper left image depicts a left anterolateral view of the external anatomy of the embryo. The liver region is semi-transparent so as to display the vasculature. The upper right image reveals the a right anterior view of the internal structures of the same embryo. The lower left image illustrates limb development as seen from a superior right view. The lower right image reveals the inner structural development from the same perpective. The cardiovascular system continues to develop at a rapid rate during this phase. The heart is the first functional organ to develop in the human embryo. It begins its existence as two simple tubes that quickly fuse to form a single chamber or heart tube that is busily pumping blood by the 23nd day. At around the 25th day, it exhibits four slightly bulged areas that represent the earliest heart chambers called sinus venosus, atrium, ventricle, bulbous cordis. During the next three weeks of development, the heart tube undergoes dramatic contortions so as to change its structure to become a four-chambered organ capable of acting as a double pump. This upper and lower right hand images depict the heart at the 36th day of development. The tubes have undergone the aforementioned changes and the heart is divided into its four definitive chambers. They will assume their adult positions in just one more month. These two images also offer a clear depiction of the vessels that convey blood to and from the heart and brain. By the fourth week of development, the heart is pumping blood through the rudimentary vascular system. The blood largely bypasses the liver (as seen in the upper left, upper right and lower right images). The umbilical vessels (posterior and anterior to the heart and liver) convey blood between the fetal circulation and the placenta where gas and nutrient exchanges occur with the mothers blood. Once the fetal circulatory system is formed, few vascular changes occur until birth and the umbilical vessels close. In the eye region (as represented by a red dot surrounded by a green ring the two upper and right lower images) the lens is almost completely closed and are starting to undergo retinal pigmentation. The growing nerve endings around the spinal cord are indicated in white in the two right hand images. The brain is also undergoing rapid differentiation as the irregularly shaped vesicles continue to form. The prominent uppermost bump in these images represent the future cerebellum. Continual development in the brain will bring about three major components, the forebrain, midbrain, and hindbrain. During this phase of development the limbs buds become visible as outpocketings from the body walls (as seen in the lower left-hand image). Six week old embryos, the distal portions of the limb buds become flattened to form the handplates and footplates. Fingers and toes will develop when a process called cell death separates the these structures into five distinct parts.

Image by TheVisualMD

Embryo 44 Day Old (Week 6) Circulatory System

Computer Generated Image from Micro-MRI, actual size of embryo = 13.0 mm - This image presents a left-sided view of the embryo during the seventh week of development. The age is calculated from the day of fertilization. The primary focus is on the circulatory system; the great number of blood vessels and veins throughout the embryo's body. The heart is indicated in bright red and the large structure underneath in deep violet red is the liver. The left lung is marked in orange. The spinal region is indicated in white. The umbilical cord, a transport mechanism for nutrients and wastes between the embryo and mother is visible on the right side of the embyro

Image by TheVisualMD

Human Embryo 18 Day Old (Week 4 for Gestational Age) with Primitive Streak

This image presents a side-view of an embryo during its third week of development. The age is calculated from the day of fertilization. The embryo is attached to the uterine wall and attains a pear-shaped structure. The white line seen on the embryo is the primitive streak, which establishes the longitudinal axis of the embryo and signals the development of the right and left sides of the body. The primitive streak also indicates where the division of the brain will occur.

Image by TheVisualMD

Embryo 56 Day Old (Week 10 Gestational Age, Week 8 Fetal Age) Visible Lung and Liver

Computer Generated Image from Micro-MRI, actual size of embryo = 30 mm - This image presents a left-sided view of the embryo undergoing its eighth week of development. The age is calculated from the day of fertilization. At this point of development, all body parts have been differentiated and all body systems are in place. The right eye is indicated as the pink circle in the facial region. The arms and legs have elongated, and distinctions of fingers and toes can be observed. The heart is indicated in red and the lungs are indicated in white. The liver is the large purplish-red organ below. The pink tube-like protrusion from the embryo is the umbilical cord, which serves as a mechanism of gas exchange, nutrient delivery and waste removal.

Image by TheVisualMD

Embryo 51 Day Old (Week 9 Gestational Age, Week 7 Fetal Age) with Translucent Skin

Computer Generated Image from Micro-MRI, actual size of embryo = 18.0 mm - This image provides a left-sided view of the embryo undergoing its eighth week of development. The age is calculated from the day of fertilization. The image has been manipulated so that the skin appears translucent so that the internal organs can be observed. The embryo still maintains a semblance of a curvature with the head bent downwards, but due to the strengthening neck muscles, the curve has decreased. The brain is highlighted orange. The large red structure in the trunk of the embryo is the liver. The red, tube-like structure protruding outwards from the embryo is the umbilical cord, a which serves as a mechanism for gas exchange, nutrient delivery and waste removal. Outlined in yellow are the arms and legs which have elongated. The hand plates have undergone distinction earlier than foot plates.

Image by TheVisualMD

Somites (developing spinal cord, neural tube), Embryo, with Prominent Yolk Sac

Contained entirely within the nurturing space of the womb, the developing embryo cannot eat or breathe, and therefore must obtain all nutrients from other sources. For the first nine weeks, the early embryo depends on the yolk sac of the embryo for nourishment. Inside the yolk sac, tiny structures called 'blood islands' form. These will become the first blood and the first blood vessels. As pregnancy continues, these important external structures develop into the embryo's link to the mother's system - the umbilical cord and the supporting network known as the placenta. Until birth, the developing embryo is completely dependent on the mother for nutrients and waste disposal through the umbilical cord and the placenta.

Image by TheVisualMD

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20 Week Old Fetus and Placenta

Lateral view of fetus, approximately 20 weeks within the placenta. Womb environment is nondescript and rendered in dark red and black. Camera zooms in. Skin appears translucent showing underlying structures. The shape of the brain is closer to its final one but is still smooth and has no definition yet. Its development is ongoing years after birth.

Video by TheVisualMD

Blastocyst Implanted in the Uterine Wall with coagulation plug

Computer - This image depicts the blastocyst implanted to the uterine wall. The structure of the blastocyst consists of inner cells, called embryoblasts, and of outer cells, called trophoblasts. Early implantation occurs around the sixth day after fertilization. Trophoblasts penetrate into the uterine epithelium wall and by the eleventh and twelfth day, the blastocyst is embedded in the endometrium, which lines the inside wall.

Image by TheVisualMD

Chromosome Arrangement for Blastomere Formation

Computer Generated Image from Micro-MRI, actual size of zygote = 0.1 mm - This image illustrates the alignment and arrangement of chromosomes, highlighted in bright glowing white. A zygote is made up of a total of 46 chromosomes; 23 which are inherited from the mother and 23 from the father. The spindle fibers (indicated in orange) pull apart the chromosomes from the middle during cell division.

Image by TheVisualMD

Embryo 6 Week Old Skeletal System

3D visualization reconstructed from scanned human data of the developing skeletal system of a six week old embryo. During this phase of development, the foreshadowing cartilaginous models of bone begin to ossify and terminal portions of the limb buds become flattened to form the hand plates and footplates, the future hands and feet. Growing outward from the middle of the shaft, the long bones that give the body its adult contours continue to grow until the age of 17 to 21.

Image by TheVisualMD

Circulatory System of a Human Embryo

Computer Generated Image from Micro-MRI of the circulatory system of an embryo. The image has been manipulated so the skin is transparent so as to reveal the circulatory system. One of the first systems to develop in the embryo, the heart can be seen near the center in the image, highlighted in bright red. Blood vessels extend from the heart, carrying blood to supply oxygen and nutrients to other parts of the body. The two gray orb-like structures in the head region indicate the developing eyes.

Image by TheVisualMD

Cardiovascular System of 44 Day Old Embryo

3D visualization based on scanned human data of a 44-day-old embryo. Focus is on the cardiovascular system. Before birth, the cardiovascular system has no use for the lungs. Gases are exchanged via the mother, and blood returning from the body to the right atrium is shunted either to the left atrium through a temporary opening called the foremen ovale, an oval-shaped window, or the thicker-walled right ventricle.

Image by TheVisualMD

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7 week old embryo

Slow zoom out from an extreme close up of the face and than back to a close up of a face of a Carnegie19 stage, about 7 weeks old embryo. Well developed eyes, nasal openings and separated fingers are already present.

Video by TheVisualMD

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Embryo Inside Womb Carnegie Stage 16

Room full of women doing yoga. Slow zoom into one of the woman's torso to reveal the womb and an embryo at Carnegie stage 16, about 40 days developing. The Micro Magnetic Resonance Imaging based visualization reveals upper limb buds that are paddle-shaped and lower limb buds that are flipper-like. The heart is the prominent pink structure at the center of the embryo. Right above the heart is the first and second pharyngeal arches which have overgrown to make the third and forth arches indistinct.

Video by TheVisualMD

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Embryo at Carnegie Stage 18

Creative take showing a water bottle transitioning into an embryo. When the water bottle is removed from the table, it is replaced with an embryo at Carnegie stage 18, about 44 days. As the camera zooms on the embryo the background fades to black. The eye and external ear auricle are distinct. The heart is represented by the red structure in the centre with the chambers beginning to take shape. The hand and foot plates are more also more distinct.

Video by TheVisualMD

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Embryo at Carnegie Stage 20

Camera zooms into a computer monitor with an image of an embryo at Carnegie stage 20, about 51 does on it. The image of the embryo transitions to a 3-D SEM-looking embryo. The camera rotates around the embryo to give a 360 view of all sides. At this stage the embryo's fingers are separated and the toes are beginning to separate. the nose is stubby and the eye is pigmented.

Video by TheVisualMD

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Embryo at Carnegie Stage 14

Environment is within the womb with an embryo at Carnegie stage 14, about 32-day developing. The embryo is encompassed within the amniotic sac and situated beside the fetus is the yolk-sac. Different camera angles rotate around the embryo. Through the amniotic sac, the fetus' heart is represented by the red structure in the centre. The 4 chambers or the heart have developed. The arm and feet plates are visible.

Video by TheVisualMD

Embryo 44 Day Old

Embryo 44 Day Old: A view inside the embryo at 42 days shows that the neural buds along the spinal cord are clearly developed. These tiny buds now are merely one-tenth the width of a human hair and will grow to more than half an inch in some cases. It is noticeable that the hands of the embryo are more defined, rays show up between fingers. The stomach and liver are also visible. At this time, the embryo develops a sense of smell.

Image by TheVisualMD

Brain Development of Human Embryo

The first period of development is call the embryonic period, which begins with fertilization and ends eight weeks later. During this period, the embryo undergoes extraordinary changes in a relatively short time. From Day 28 to Day 50 it grows considerably in size--three to four times the original mass. Early signs are the expansion of spaces within the brain called ventricles, followed by the creation of new nervous tissue. Because of the brain's complexity, development takes place from head to toe.

Image by TheVisualMD

6 Week Old Embryo with Undifferentiated Gonad

Three-dimensional visualization reconstructed from scanned human data. Lateral view of an embryo at 6 weeks, with internal undifferentiated gonad development visible. Structures shown include the eye, 1st, 2nd, and 3rd pharyngeal arches, upper and lower limb buds, and tail, as well as the umbilical cord connecting the embryo to the surrounding chorionic sac. At 6 weeks of development, male and female fetuses look identical both internally and externally. At this stage internal gonad development consists of two undifferentiated ducts: the Mullerian ducts, and the Wolffian ducts. External genital development consists of an indifferent penis, which will either form into a penis and scrotum or clitoris and labia. Differentiation of the gonads begins after the 6th week, while external genital differentiation starts a little later, after the 7th week.

Image by TheVisualMD

Brain of Embryo Cross Section

Early signs are the expansion of spaces within the brain called ventricles, followed by the creation of new nervous tissue. Because of the brain's complexity, development takes place from head to toe.

Image by TheVisualMD

Embryo 56 Day Old Heart and Blood Vessel

Computer Generated Image from Micro-MRI, actual size of embryo = 30.0 mm - This image provides a right-sided perspective of an embryo during its eighth week of development. The age is calculated from the day of fertilization. The skin has been made translucent so that internal organs can be observed. The brain is highlighted in yellow-orange. Red blood vessels branching from the functionally complete, four-chambered heart, indicated in red, extend towards the brain. In the facial region, the red circle indicates the eye. The liver, shown in pale yellow, is situated below the heart.

Image by TheVisualMD

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Cleavage in Developing Embryo

Being shown is the embryonic cleavage or rapid division of a zygote to form a multicellular morula. A morula is an embryo at an early stage of embryonic development, consisting of approximately 12-32 cells (blastomeres) in a sold ball contained within the zona pellucida.

Video by TheVisualMD

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Embryo at Carnegie Stage 19 Cardiovascular System

Lateral view of a woman doing a sit up on the floor. Camera zooms into woman's pelvic area to reveal an embryo at Carnegie stage 19, about 48 days. As the embryo rotates, all of its structures dissolve away to only leave the cardiovascular system. By this stage, the embryo's cardiovascular system is a vast and intricate system needed to fuel its growth.

Video by TheVisualMD

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Embryo at Carnegie Stage 14

Environment is within the womb of an embryo at Carnegie stage 14, about 32 days, developing. The embryo is encompassed within the amniotic sac and situated beside the fetus is the yolk-sac. Different camera angles rotate around the fetus. Through the amniotic, the fetus' heart is represented by the red structure in the centre. The 4 chambers heart can be see beating at the camera rotates from behind. The arm and feet plates are visible.

Video by TheVisualMD

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Embryo at Carnegie Stage 16

Camera view from the underside of an embryo at Carnegie stage 16, about 40 days. View is of the tail and the foot plates.

Video by TheVisualMD

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Embryo at Carnegie Stage 18

Lateral view of a woman doing a sit up on the floor. Camera zooms into woman's pelvic area to reveal an embryo at Carnegie stage 18, about 44 days. As the embryo rotates, all of its structures dissolve away to only leave the cardiovascular system. By this stage, the embryo's cardiovascular system is a vast and intricate system needed to fuel its growth.

Video by TheVisualMD

Embryos at 44 Days (8 for Gestational Age) with Circulatory System

Through rotation and gradual imaging techniques, these human fetal visualizations show the vast amount of blood circulation needed to fuel the extraordinary growth of a 44-day-old fetus. The images at the bottom show only the circulatory system. The blood transports so many substances and does so many jobs it's hard to name them. Chiefly, though, it moves oxygen and food to all parts of the body while taking away waste chemicals. This process necessarily begins in the first week, and by twenty days watertight tubes branch throughout the embryo. The system grows \"ahead\" of the baby, proliferating in all directions like highways on a busy map, stimulating new areas of development. (Understanding how blood vessels are laid down in relation to cellular reproduction has provided some of the most hopeful recent insights against cancer.) After birth this network also serves to provide the baby with central heat, distributing warmth evenly through the body, from busy parts like the heart to cooler areas like still muscles. Please see our Infant Nutrition Health Center.

Image by TheVisualMD

Implantation (human embryo)

Illustration of Implantation of a human embryo

Image by OpenStax College

9-Week Human Embryo from Ectopic Pregnancy

The size (2cm in length) and anatomic features suggest development equivalent to a nine-week pregnancy (or seven weeks post ovulation). In obstetrics, pregnancy is dated from the first day of the last menstrual period, which is about two weeks prior to the ovulation that resulted in the pregnancy

Image by Ed Uthman

Tubal Pregnancy with embryo

This photo of an opened oviduct with an ectopic pregnancy features a spectacularly well preserved 10-millimeter embryo. It is uncommon to see any embryo at all in an ectopic, and for one to be this well preserved (and undisturbed by the prosector's knife) is quite unusual. Even an embryo this tiny shows very distinct anatomic features, including tail, limb buds, heart (which actually protrudes from the chest), eye cups, cornea/lens, brain, and prominent segmentation into somites. The gestational sac is surrounded by myriad chorionic villi resembling elongated party balloons. This embryo is about five weeks old (or seven weeks in the biologically misleading but eminently practical dating system used in obstetrics).

Image by Ed Uthman, MD

Embryo and Fetus Development

Embryo and Fetus Development, placenta and amniotic sac

Image by TheVisualMD

Brain Development of 29 Day Old Embryo

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Brain development from embryo to adult

The cerebral cortex--the most prominent feature when we think of a human brain--derives from the forebrain. This region is responsible for reason, planning, emotion, and problem solving, and by the end of the second trimester it is the primary visible structure. If you examine the surface of the cerebral cortex, you'll see convoluted folds; the raised surfaces are known as gyri and the \"trenches\" are sulci. These irregular folds provide greater surface area for cell-to-cell communication and interaction, increasing the brain's complexity.

Interactive by TheVisualMD

Embryo 36 Day Old (Week 7 for Gestational Age) Brain and Cardiovascular System

TheVisualMD

Embryo 36 Day Old (Week 7 for Gestational Age) External and Internal Anatomy

TheVisualMD

Embryo 44 Day Old (Week 6) Circulatory System

TheVisualMD

Human Embryo 18 Day Old (Week 4 for Gestational Age) with Primitive Streak

TheVisualMD

Embryo 56 Day Old (Week 10 Gestational Age, Week 8 Fetal Age) Visible Lung and Liver

TheVisualMD

Embryo 51 Day Old (Week 9 Gestational Age, Week 7 Fetal Age) with Translucent Skin

TheVisualMD

Somites (developing spinal cord, neural tube), Embryo, with Prominent Yolk Sac

TheVisualMD

0:22

20 Week Old Fetus and Placenta

TheVisualMD

Blastocyst Implanted in the Uterine Wall with coagulation plug

TheVisualMD

Chromosome Arrangement for Blastomere Formation

TheVisualMD

Embryo 6 Week Old Skeletal System

TheVisualMD

Circulatory System of a Human Embryo

TheVisualMD

Cardiovascular System of 44 Day Old Embryo

TheVisualMD

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7 week old embryo

TheVisualMD

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Embryo Inside Womb Carnegie Stage 16

TheVisualMD

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Embryo at Carnegie Stage 18

TheVisualMD

0:24

Embryo at Carnegie Stage 20

TheVisualMD

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Embryo at Carnegie Stage 14

TheVisualMD

Embryo 44 Day Old

TheVisualMD

Brain Development of Human Embryo

TheVisualMD

6 Week Old Embryo with Undifferentiated Gonad

TheVisualMD

Brain of Embryo Cross Section

TheVisualMD

Embryo 56 Day Old Heart and Blood Vessel

TheVisualMD

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Cleavage in Developing Embryo

TheVisualMD

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Embryo at Carnegie Stage 19 Cardiovascular System

TheVisualMD

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Embryo at Carnegie Stage 14

TheVisualMD

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Embryo at Carnegie Stage 16

TheVisualMD

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Embryo at Carnegie Stage 18

TheVisualMD

Embryos at 44 Days (8 for Gestational Age) with Circulatory System

TheVisualMD

Implantation (human embryo)

OpenStax College

9-Week Human Embryo from Ectopic Pregnancy

Ed Uthman

Tubal Pregnancy with embryo

Ed Uthman, MD

Embryo and Fetus Development

TheVisualMD

Brain development from embryo to adult

TheVisualMD

Nuchal Translucency Scan

Nuchal Translucency Scan

Also called: NT Scan, Nuchal Translucency Screening, NT Screening, Nuchal Translucency Ultrasound Screening

A nuchal translucency scan, or NT scan, is a specialized routine ultrasound performed at the end of the first trimester of pregnancy. The NT scan measures the clear (translucent) space in the tissue at the back of your baby's neck. It is used to help identify chromosomal abnormalities.

Nuchal Translucency Scan

Also called: NT Scan, Nuchal Translucency Screening, NT Screening, Nuchal Translucency Ultrasound Screening

A nuchal translucency scan, or NT scan, is a specialized routine ultrasound performed at the end of the first trimester of pregnancy. The NT scan measures the clear (translucent) space in the tissue at the back of your baby's neck. It is used to help identify chromosomal abnormalities.

{"label":"Nuchal Translucency Scan Reference Range","scale":"lin","step":0.1,"units":[{"printSymbol":"mm","code":"mm","name":"millimeter"}],"hideunits":false,"items":[{"flag":"normal","label":{"short":"Normal","long":"Normal","orientation":"horizontal"},"values":{"min":0,"max":2.8},"text":"Your baby's NT scan results are normal, which means that this result alone is not expected to negatively impact the fetal health. ","conditions":[]},{"flag":"abnormal","label":{"short":"High","long":"High","orientation":"horizontal"},"values":{"min":2.8,"max":7},"text":"The higher the measure of the fluid in the fetus neck, the higher the risk of chromosomal abnormalities. An increased NT does not mean there is definitely a problem. Talk to your OB\/GYN to know what the results mean in your specific case.","conditions":["Down syndrome","Edwards syndrome","Patau Syndrome"]}],"value":1.4}[{"normal":0},{"abnormal":0}]
Use the slider below to see how your results affect your health.
mm
2.8
Your result is Normal.
Your baby's NT scan results are normal, which means that this result alone is not expected to negatively impact the fetal health.
Related conditions
The objective of this test along with the other first-trimester screening tests is to identify a pregnant woman’s risk of having a baby with chromosomal abnormalities such as Down syndrome, Edwards syndrome, or Patau syndrome.
Your doctor may recommend this test if:
- You have a history of fetal abnormalities
- Familiar genetic conditions
- To assess the risk of chromosome abnormalities in the fetus
1. First Trimester Screening [accessed on Nov 14, 2018]
2. 1STT - Clinical: First Trimester Maternal Screen [accessed on Nov 14, 2018]
3. Nuchal translucency | Radiology Reference Article | Radiopaedia.org [accessed on Nov 14, 2018]
4. NT Scan: What You’ll Find Out [accessed on Nov 14, 2018]
5. Nuchal Translucency Ultrasound Screening Test In 1st Trimester [accessed on Nov 14, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (7)

Medical ultrasound image. Provided as-is. Please feel free to categorise, add description, crop.

Medical ultrasound image. Provided as-is. Please feel free to categorise, add description, crop.

Image by Nevit Dilmen (talk)

Prenatal Testing: Nuchal Test (Pregnancy Health Guru)

Video by Healthguru/YouTube

Fetal Medicine Foundation - Nuchal translucency

Video by FMFoundation/YouTube

How to perform Nuchal Translucency Scan

Video by ultrasoundlink/YouTube

Nuchal Translucency Patient Information Video

Video by Queensland X-Ray/YouTube

CRL Crown rump length 12 weeks ecografia Dr. Wolfgang Moroder

Ultrasound image of the foetus at 12 weeks of pregnancy in a sagittal scan. Measurements of fetal Crown Rump Lenght (CRL).

Image by This Photo was taken by Wolfgang Moroder. Feel free to use my photos, but please mention me as the author and send me a message. This image is not public domain. Please respect the copyright protection. It may only be used according to the rules mentioned here. This specifically excludes use in social media, if applicable terms of the licenses listed here not appropriate. Please do not upload an updated image here without consultation with the Author. The author would like to make corrections only at his own source. This ensures that the changes are preserved.Please if you think that any changes should be required, please inform the author.Otherwise you can upload a new image with a new name. Please use one of the templates derivative or extract. /Wikimedia

Coronal scan of the fetal esophagus Ecografia a ultrasuoni Dr. Wolfgang Moroder

Ultrasound image of the fetal esophagus at 19 weeks of pregnancy.

Image by This Photo was taken by Wolfgang Moroder. Feel free to use my photos, but please mention me as the author and send me a message. This image is not public domain. Please respect the copyright protection. It may only be used according to the rules mentioned here. This specifically excludes use in social media, if applicable terms of the licenses listed here not appropriate. Please do not upload an updated image here without consultation with the Author. The author would like to make corrections only at his own source. This ensures that the changes are preserved.Please if you think that any changes should be required, please inform the author.Otherwise you can upload a new image with a new name. Please use one of the templates derivative or extract. /Wikimedia

Medical ultrasound image. Provided as-is. Please feel free to categorise, add description, crop.

Nevit Dilmen (talk)

2:42

Prenatal Testing: Nuchal Test (Pregnancy Health Guru)

Healthguru/YouTube

2:01

Fetal Medicine Foundation - Nuchal translucency

FMFoundation/YouTube

2:24

How to perform Nuchal Translucency Scan

ultrasoundlink/YouTube

7:17

Nuchal Translucency Patient Information Video

Queensland X-Ray/YouTube

CRL Crown rump length 12 weeks ecografia Dr. Wolfgang Moroder

This Photo was taken by Wolfgang Moroder. Feel free to use my photos, but please mention me as the author and send me a message. This image is not public domain. Please respect the copyright protection. It may only be used according to the rules mentioned here. This specifically excludes use in social media, if applicable terms of the licenses listed here not appropriate. Please do not upload an updated image here without consultation with the Author. The author would like to make corrections only at his own source. This ensures that the changes are preserved.Please if you think that any changes should be required, please inform the author.Otherwise you can upload a new image with a new name. Please use one of the templates derivative or extract. /Wikimedia

Coronal scan of the fetal esophagus Ecografia a ultrasuoni Dr. Wolfgang Moroder

This Photo was taken by Wolfgang Moroder. Feel free to use my photos, but please mention me as the author and send me a message. This image is not public domain. Please respect the copyright protection. It may only be used according to the rules mentioned here. This specifically excludes use in social media, if applicable terms of the licenses listed here not appropriate. Please do not upload an updated image here without consultation with the Author. The author would like to make corrections only at his own source. This ensures that the changes are preserved.Please if you think that any changes should be required, please inform the author.Otherwise you can upload a new image with a new name. Please use one of the templates derivative or extract. /Wikimedia

Week 3

Oocyte and Developing Zona Pellucida in the Ovary

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Mitotic Division

Interactive by TheVisualMD

Week 3 of Pregnancy

Only one sperm cell among hundreds of millions succeeds in penetrating the egg.

The fertilized egg starts dividing even as it’s being carried toward the welcoming womb. The egg, now called a zygote, divides into two cells after about 24 hours, four cells after 48 hours, and 6-12 cells in 3 days. As it divides, it’s slowly transported down the fallopian tube by tubal muscle movements and the beating of tiny hairlike projections called cilia. When it reaches the 16-cell stage, it’s called a morula, meaning “little mulberry.”

Approximately 72 hours after fertilization, the morula reaches the uterus, where it floats around for about 2 days. Now, for the first time, the morula starts to divide into the specialized cells that will later form fetal structures. A fluid-filled cavity forms inside the morula, transforming it into a hollow ball called a blastocyst.

The blastocyst consists of around 60-120 cells. It’s only the size of the tip of a ballpoint pen, but it’s big enough
to require additional food and oxygen to sustain it. Meanwhile, hormones from your ovaries have been bathing the uterine lining, making it soft and porous.

The blastocyst attaches itself to the receptive lining and then, using knifelike enzymes, burrows deep inside it, rupturing capillaries so that it is awash in nourishing blood. The chorion, a tough membrane, forms, and fingerlike extensions reach out of it and
tap into your circulation.

The growing life inside you has secured a home that will provide it with food and shelter for the next 9 months.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (1)

0:25

Cleavage in Developing Embryo

TheVisualMD

Week 4

Blastocyst in Uterine Wall

Image by TheVisualMD

Week 4 of Pregnancy

Having secured a home and a food supply, the blastocyst doubles in size every day.

Now firmly nestled in your uterus, the blastocyst quickly sets about becoming an embryo. For the next several days, it will double in size every day. Its cells differentiate into two distinct types: those that will form the embryo, and those that will develop into the yolk sac and, eventually, the placenta.

About 3 weeks after fertilization, three layers become apparent in the embryo cells. The endoderm, or inner layer, develops into your baby’s bladder, lungs, digestive system, and other organs. The mesoderm, or middle layer, becomes the heart, reproductive organs, bones, muscles, and other tissues. The ectoderm, or outer layer, forms the nervous system as well as the hair, skin, nails, connective tissue, and sweat glands.

The embryo becomes pear shaped, broader at the end that will become the head. A longitudinal line called the “primitive streak” appears, the central axis around which tissues, organs, and then systems will form. The line that runs through the broad end of the embryo indicates where the brain will divide into two hemispheres.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (1)

0:28

Implantation

TheVisualMD

Week 6

Somites (developing spinal cord, neural tube), Embryo, with Prominent Yolk Sac

Image by TheVisualMD

Week 6 of Pregnancy

The embryo, now the size of a grain of rice, has a “tail” that will recede in a few weeks. These tissues later develop into the coccyx, or tailbone.

The embryo, looking more like a tadpole than a human, begins to grow by leaps and bounds. It’s still tiny, though, measuring only about 4 mm from crown to rump, the size of a grain of rice. (Embryos and fetuses are most often measured from crown to rump because the baby’s legs are generally bent and hard to measure.) That “tail” is actually the end of the neural tube. The neural tube develops into the brain and spinal cord, and the tissues of the tail become the coccyx (tailbone). Somites, paired masses of cells that form alongside the neural tube, develop into vertebrae and other tissues.

With the placenta still forming, the embryo depends on the yolk sac for nourishment. Inside the yolk sac, tiny structures called “blood islands” form. These will become the first blood cells and the first blood vessels.

The embryonic brain and heart grow rapidly this week and will soon occupy about half of the entire embryonic body. The brain is developing three separate parts: the forebrain, midbrain, and hindbrain. The head is growing larger to accommodate all that growth. The arches under the emerging brain will become the face and neck.

Around day 28 after fertilization, the early divisions of what will be the heart’s four chambers are apparent. Just a few days later, the four chambers are fully formed. The tiny buds of the lower and upper limbs appear, too.

In the front view, the head (top) can be seen bending downward. The tubelike form in the head is the neural tube, formed by the closing of the neural groove 28 days after fertilization. When the tube doesn’t close completely, neural tube defects (NTDs) develop. NTDs are common birth defects, occurring in about 1 in 1,000 live births.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (5)

0:31

Embryo Inside Womb Carnegie Stage 16

TheVisualMD

0:07

Hand Development from Embryo to Fetus

TheVisualMD

0:06

Brain Development of Fetus

TheVisualMD

Embryo Anatomy at Week 6 (labeled)

TheVisualMD

Neural Tube of embryo at Week six of development

TheVisualMD

Week 7

Embryo at 7 weeks

Image by TheVisualMD

Week 7 of Pregnancy

An internal view of the embryo at 7 weeks reveals the brain and cardiovascular system (heart and blood vessels).

The beginnings of arms and legs are emerging from your little embryo, now about 5-8 mm from crown to rump, around the size of a pea. The upper limb buds start to separate into segments that will become shoulders, wrists, and hand plates. The lower buds flatten, looking more like flippers than legs.

Until now—35 days after fertilization—growth has been mostly focused on the heart and the head because they are needed sooner than the organs of the lower half of the body. The brain, in particular, must develop rapidly so that it can regulate blood circulation and heart rate. Now, though, digestive organs—the liver, stomach, and esophagus—start to form as well.

At this point, the embryo has no discernible facial features, only pits that will become the ears, eyes, and nose. Now the ear pits expand and begin to take shape, while the nasal pit appears to deepen and climb toward the eye lens pit.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (2)

0:12

7 week old embryo

TheVisualMD

Embryo Development at 7 Weeks

TheVisualMD

Week 8

Week 8 Embryo

Image by TheVisualMD

Week 8 of Pregnancy

Development proceeds from the top down: hands and fingers develop ahead of feet and toes.

Until this week, a human embryo doesn’t look very different from that of a mouse, a chicken, or a pig. All that is about to change. Though it’s only about half an inch (10-14 mm) long and weighs less than a paper clip, your baby-to-be is starting to acquire a human face.

Fetal growth proceeds from head to toe. The head develops ahead of the rest of the body; arms develop before legs, fingers before toes. Growth occurs from the inside out as well: internal organs form before limbs.

The embryonic cardiovascular system grows “ahead” of the baby, stimulating new areas of development. At week 8 of gestation, it’s possible to see the tiny embryonic heart beating.

The folds of the eyelids and the jaws form, and the tip of the nose can be clearly seen. Ears are developing inside and out: internally, the semicircular canals are laid down, while externally mounds of tissue erupt where the whorls of the ears will grow. The eyes become pigmented and continue their incredibly complex development. Delicate eye muscles begin to form and nerve cells appear in the developing retina.

Your little embryo’s posture is improving. That tight, curled-up position loosens as the neck and trunk begin to grow and cartilage and bone elongate throughout the body. The tail begins to shrink. Fingers start to make their appearance as the hands become notched. Several days later, toe notches appear in the foot plate.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (12)

Cardiovascular System at 8 Weeks

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Embryo's Cardiovascular System at 8 Weeks

3D visualization based on scanned human data of a 8-week-old embryo. Focus is on the cardiovascular system.

Interactive by TheVisualMD

Internal Organs and Systems at 8 Weeks

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Embryo Development at 8 Weeks

View the internal organs and systems of an embryo at 8 weeks development.

Interactive by TheVisualMD

Fetal Development

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Fetal Development at 8 Weeks

The fetal period begins at the end of the 10th week of gestation (8th week of development). At the start of the fetal stage, the fetus is typically about 30 mm (1.2 inches) in length from crown to rump, and weighs about 8 grams. The head makes up nearly half of the fetus' size. The heart, hands, feet, brain and other organs are present, but are only at the beginning of development and have minimal operation. At 40 days, the embryo begins to curve into a C shape. The heart bulges, further develops, and begins to beat in a regular rhythm. Branchial arches, grooves which will form structures of the face and neck, form. At 56 days, the intestines, liver, kidneys, lungs, and heart are all taking shape. The brain and facial features of the fetus continue to develop. The arms and legs have lengthened, and the hands and feet have digits, but may still be webbed. During the sixth month, the brain is in a period of rapid development and the bones are becoming solid. The fetus is almost fully formed, but the lungs are not yet fully developed. The fetus obtains oxygen and nutrients from the mother through the placenta and the umbilical cord. All major structures are already formed in the fetus, but they continue to grow and develop.

Interactive by TheVisualMD

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Fetus 8 Week Old Internal Organ

Week eight is a milestone in a baby's life. The Micro Magnetic Resonance Imaging based, visualization depicts a normal, but oversized looking liver in the thorax, a fairly defined lung with already distinguishable lobes, an already 4 chamber heart that beats now for about 4 weeks. By the end of this week the embryo has distinct human characteristics. Every organ and system is already in place. Developmental in the fetal period needs further differentiation of the organs and tissues and a rapid gain in size and weight.

Video by TheVisualMD

This browser does not support the video element.

Fetus 8 Week Old Internal Anatomy

Week eight is a milestone in a baby's life. The Micro Magnetic Resonance Imaging based visualization reveals a normal, but oversized looking liver (purple) in the thorax, a fairly defined lung, an already 4 chamber heart that beats now for about 4 weeks. By the end of this week the embryo has distinct human characteristics. Every organ and system is already in place. Developmental in the fetal period needs further differentiation of the organs and tissues and a rapid gain in size and weight.

Video by TheVisualMD

This browser does not support the video element.

20 Week Old Fetus and Placenta

Lateral view of fetus, approximately 20 weeks within the placenta. Womb environment is nondescript and rendered in dark red and black. Camera zooms in. Skin appears translucent showing underlying structures. The shape of the brain is closer to its final one but is still smooth and has no definition yet. Its development is ongoing years after birth.

Video by TheVisualMD

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8 Week Old Fetus Cardiovascular System

Camera is zoomed out above the womb containing an 8 week old fetus. Environment is a pinkish fog and the womb is rendered in the translucent glass-style. Camera pans and zooms toward a lateral view of the fetus. Then around to its front. The skin fades out and the developing circulatory, nervous system and eyes are revealed.

Video by TheVisualMD

This browser does not support the video element.

Indifferent Penis of 8 Week Old Fetus

Animation begins with a posterior shot of the genitalia of an 8-week fetus. The genitalia of the fetus develop from week 4 and become external from week 8. Up until this point, the embryonic sex organs in boys and girls are identical. The shot changes to a close-up of the genitalia where the urethral groove can be seen closing up which will result in a boy being born. The next shot is of a further developed genitalia where the urethral groove remained open and the genital tubercle has shrunk to become the clitoris which will result in a girl being born.

Video by TheVisualMD

This browser does not support the video element.

Genitalia of 8 Week Old Fetus

Animation begins with a posterior shot of the genitalia of an 8-week fetus. The genitalia of the fetus develop from week 4 and become external from week 8. Up until this point, the embryonic sex organs in boys and girls are identical. There are particles floating suggesting the fetus is in utero.

Video by TheVisualMD

This browser does not support the video element.

Indifferent Penis of 8 Week Old Fetus

Animation begins with a posterior shot of the genitalia of an 8-week fetus. The genitalia of the fetus develop from week 4 and become external from week 8. Up until this point, the embryonic sex organs in boys and girls are identical. There are particles floating suggesting the fetus is in utero.

Video by TheVisualMD

This browser does not support the video element.

Week 8 Embryo

Video by TheVisualMD

This browser does not support the video element.

Cardiovascular System of 8 Week Old Embryo

The heart and circulatory system of an eight week old embryo beginning with a closeup of it's back within the red chorion. As the camera rotates, the embryo becomes semi-transparent in order to view its beating heart and circulatory system. Once the embryo is in profile, the circulatory system begins fading out. The lungs also fade in and out. The skin fades in almost immediately following the lungs and the camera zooms out to end the scene.

Video by TheVisualMD

Embryo's Cardiovascular System at 8 Weeks

TheVisualMD

Embryo Development at 8 Weeks

TheVisualMD

Fetal Development at 8 Weeks

TheVisualMD

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Fetus 8 Week Old Internal Organ

TheVisualMD

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Fetus 8 Week Old Internal Anatomy

TheVisualMD

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20 Week Old Fetus and Placenta

TheVisualMD

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8 Week Old Fetus Cardiovascular System

TheVisualMD

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Indifferent Penis of 8 Week Old Fetus

TheVisualMD

Sensitive content

This media may include sensitive content

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Genitalia of 8 Week Old Fetus

TheVisualMD

Sensitive content

This media may include sensitive content

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Indifferent Penis of 8 Week Old Fetus

TheVisualMD

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Week 8 Embryo

TheVisualMD

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Cardiovascular System of 8 Week Old Embryo

TheVisualMD

Week 9

Embryo - Week 9

Image by TheVisualMD

Week 9 of Pregnancy

Eyes begin their development at the side of the head and move to the front of the face as the embryo grows.

Now about three quarters of an inch (17-22 mm) long, around the size of a grape, your embryo is starting to look distinctly human. Fingers and toes, although webbed, are defined. Knees have formed in the legs and the arms bend at the elbow. The tail recedes as the legs grow. The embryo’s body and limbs can now move. You won’t feel those movements, however, until the embryo is bigger.

Inside, too, there’s a lot going on. Amazingly, every internal organ is present (though not completely developed), and fully 99% of all the muscles can be identified. Threadlike nerves are feathering themselves throughout the body. Sex organs are developing. Blood circulates in vessels throughout the tiny body, distributing oxygen and food and carrying away waste.

The baby’s lungs won’t function until birth, however: embryo and fetus are completely dependent on the mother to provide oxygen and nutrition via the umbilical cord.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (2)

Embryo Development at 9 Weeks

TheVisualMD

0:06

Brain Development of Fetus

TheVisualMD

Week 10

Week 10 Embryo

Image by TheVisualMD

Week 10 of Pregnancy

56 days after fertilization, the embryo is the size of an almond.

This is a big week for your little embryo—and in fact, at the end of this week, your embryo will be called a fetus! Although the body now measures just over an inch (28-30 mm) long, about the size of an almond in its shell, and weighs just 1/30 oz (.9 g), an incredible amount of growth and development has taken place in a mere 56 days.

Internally, all of the body’s myriad parts—cells, tissues, organs, systems—have been differentiated. The diaphragm has formed. The heart is now functionally complete and major blood vessels assume their final plan. The lungs have divided into lobes and are laced with tubules, and the intestines begin to move from the umbilical cord into the body cavity.

The amnion and the placenta are growing. The amnion is a membrane that surrounds and helps to protect the embryo. The placenta connects the developing fetus to the wall of the uterus and provides nutrition, oxygen, and waste removal.

Externally, the embryo no longer resembles a tiny sea creature: the little tail disappears, as does the webbing between the fingers and the toes. The eyes continue to move from the side to the front of the head. As they move, skin grows over them to protect the delicate cornea and quickly develops the creases that will later define the eyelids. The upper lip forms, and the folds of the ears attain their final shape.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (4)

Internal organs of the embryo at week 10

TheVisualMD

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10 Week Old Fetus with Developing Organ

TheVisualMD

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10 Week Old Fetus Inside Mother's Womb

TheVisualMD

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10 Week Old Fetus in Utero

TheVisualMD

Week 11

Human Fetus External and Internal Anatomy 11 Week Gestational Age, 9 Week Fetal Age

Image by TheVisualMD

Week 11 of Pregnancy

Bones, like those in the rib cage, are getting harder.

Week 11 is a milestone in the development of your little fetus: all major organs are present and vital body systems, like the circulatory, respiratory, and digestive systems, have been laid out. The fetus now measures about 1.5-2" (3.8-5 cm) crown to rump, the size of a small plum. From this point on, development is mostly about growth and integration.

Organs and systems must coordinate functions so that at the moment your baby leaves the protection of your body, amazingly, he will be able to eat, breathe, and circulate blood independently. The next 7 months will see incredible growth: your baby’s weight will multiply up to 1,000 times. In just 3 weeks, from week 11 to week 14, the fetus will double in length.

In appearance, the most noticeable change in the fetus is in stature. Every day he’s looking more human, back straighter, abdomen more tucked. The head is still very large compared with the rest of the body, and now there’s a noticeable neck. The skin is thickening and becoming less transparent—hair follicles have even formed under the surface! Tiny fingernails and toenails have begun to grow, too.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (7)

Internal organs and systems at 11 weeks

1

2

3

Embryo Development at 11 Weeks

View the internal organs and systems of an embryo at 11 weeks development.

Interactive by TheVisualMD

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11 Week Old Fetus in Utero

11-week fetus in utero. The camera shot is a lateral zoomed in view of the fetus. There are particles floating similating the womb. The cameara zooms out to show the entire body of the fetus and umbilical cord.

Video by TheVisualMD

This browser does not support the video element.

Embryo - Week 11

View the embryo and its beating heart, audible now with a stethoscope

Organs of 11 Week Embryo

The lungs and kidneys are the most prominent organs at 11 weeks.

Image by TheVisualMD

Internal Anatomy of Week 11 Embryo (Interactive)

Tap and swipe the image or slider to reveal internal anatomy

Image by TheVisualMD

Fetus 9 Week Old (11 Weeks Gestational Age, 9 Weeks Fetal Age) Brain and Lung

Computer generated Image reconstructed from scanned human data. Actual size of fetus = 1.5 inches, 0.14 oz. This image provides a left-sided view of a 9-week-old fetus. The age is calculated from the day of fertilization. The image has been manipulated so that both internal and external structures are visible. In the head region, the brain is highlighted in pale yellow, and the left eye and left ear are indicated as pink rings. The left lung, shown beneath the arm, is marked in dark yellow. The liver, shown beneath the lung, is highlighted in pink. The dark pink tube-like structure alongside the fetus is the umbilical cord, which provides means of exchanging nutrients and wastes between mother and fetus. At this phase, the fetus begins to uncurl. Its head becomes more erect, back straightens, and the abdomen tucks in.

Image by TheVisualMD

Embryo Development at 11 Weeks

TheVisualMD

0:11

11 Week Old Fetus in Utero

TheVisualMD

0:09

Embryo - Week 11

Organs of 11 Week Embryo

TheVisualMD

Internal Anatomy of Week 11 Embryo (Interactive)

TheVisualMD

Fetus 9 Week Old (11 Weeks Gestational Age, 9 Weeks Fetal Age) Brain and Lung

TheVisualMD

Week 12

Human Fetus External and Internal Anatomy 12 Week Gestational Age, 10 Week Fetal Age

Image by TheVisualMD

Week 12 of Pregnancy

As nerves integrate with muscles, the fetus becomes more active—making faces, kicking, bending, and stretching.

The fetus is now approximately the size of a lime—solarge you can hear the heartbeat! Using ultrasound, your doctor can let you hear the rapid rhythm of the fetal heart. At around 160 beats per minute, it’s about twice as fast as yours.

The fetus is now about 2.5" (6 cm) in length and weighs about .5 oz (14 g). The liver accounts for about 10% of that weight. Together with the spleen, the liver is busy producing blood cells for the fetus.

Around week 12, several more structures develop enough to begin functioning. The thyroid gland, which helps regulate metabolism, starts working. The pancreas, a gland, begins to produce digestive enzymes. The gallbladder, an organ, starts to secrete bile into the digestive tract.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (2)

Sensitive content

This media may include sensitive content

External Genitalia of a 12 Week Old (Week 13 Gestational Age, Week 12 Fetal Age) Male Fetus

TheVisualMD

Fetus 10 Week Old (12 Weeks Gestational Age, 10 Weeks Fetal Age) Inside Amniotic Sac

TheVisualMD

Second Trimester

Prenatal Development

Image by TheVisualMD

Second Trimester of Pregnancy (Week 13–Week 28)

Most women find the second trimester of pregnancy easier than the first. But it is just as important to stay informed about your pregnancy during these months.

You might notice that symptoms like nausea and fatigue are going away. But other new, more noticeable changes to your body are now happening. Your abdomen will expand as the baby continues to grow. And before this trimester is over, you will feel your baby beginning to move!

As your body changes to make room for your growing baby, you may have:

Body aches, such as back, abdomen, groin, or thigh pain
Stretch marks on your abdomen, breasts, thighs, or buttocks
Darkening of the skin around your nipples
A line on the skin running from belly button to pubic hairline
Patches of darker skin, usually over the cheeks, forehead, nose, or upper lip. Patches often match on both sides of the face. This is sometimes called the mask of pregnancy.
Numb or tingling hands, called carpal tunnel syndrome
Itching on the abdomen, palms, and soles of the feet. (Call your doctor if you have nausea, loss of appetite, vomiting, jaundice or fatigue combined with itching. These can be signs of a serious liver problem.)
Swelling of the ankles, fingers, and face. (If you notice any sudden or extreme swelling or if you gain a lot of weight really quickly, call your doctor right away. This could be a sign of preeclampsia.)

Your developing baby

Second trimester (week 13 - week 28)

At 16 weeks:

Muscle tissue and bone continue to form, creating a more complete skeleton.
Skin begins to form. You can nearly see through it.
Meconium (mih-KOH-nee-uhm) develops in your baby's intestinal tract. This will be your baby's first bowel movement.
Your baby makes sucking motions with the mouth (sucking reflex).
Your baby reaches a length of about 4 to 5 inches and weighs almost 3 ounces.

At 20 weeks:

Your baby is more active. You might feel slight fluttering.
Your baby is covered by fine, downy hair called lanugo (luh-NOO-goh) and a waxy coating called vernix. This protects the forming skin underneath.
Eyebrows, eyelashes, fingernails, and toenails have formed. Your baby can even scratch itself.
Your baby can hear and swallow.
Now halfway through your pregnancy, your baby is about 6 inches long and weighs about 9 ounces.

At 24 weeks:

Bone marrow begins to make blood cells.
Taste buds form on your baby's tongue.
Footprints and fingerprints have formed.
Real hair begins to grow on your baby's head.
The lungs are formed, but do not work.
The hand and startle reflex develop.
Your baby sleeps and wakes regularly.
If your baby is a boy, his testicles begin to move from the abdomen into the scrotum. If your baby is a girl, her uterus and ovaries are in place, and a lifetime supply of eggs have formed in the ovaries.
Your baby stores fat and has gained quite a bit of weight. Now at about 12 inches long, your baby weighs about 1½ pounds.

Source: Office on Women's Health (OWH), U.S. Department of Health and Human Services

Additional Materials (5)

Fetus at 26 Weeks

TheVisualMD

2:19

Your Growing Baby's Changes Through the Second Trimester | WebMD

WebMD/YouTube

1:33

Second Trimester Blood Tests | Kaiser Permanente

Kaiser Permanente Thrive/YouTube

1:13

Pregnancy Exercises in the Second Trimester | Kaiser Permanente

Kaiser Permanente Thrive/YouTube

2:01

Second Trimester Begins: Weeks 13-16 of Pregnancy | Parents

Parents/YouTube

Second Trimester Prenatal Tests

Second Trimester Prenatal Tests

The second-trimester prenatal tests are done to screen for pregnancy-related conditions that could affect the baby. This test also helps detect how high is the baby's risk of having chromosomal disorders and other problems such as heart defects or neural tube defects, such as spina bifida. These tests are normally done between your third and sixth months...

Second Trimester Prenatal Tests

The second-trimester prenatal tests are done to screen for pregnancy-related conditions that could affect the baby. This test also helps detect how high is the baby's risk of having chromosomal disorders and other problems such as heart defects or neural tube defects, such as spina bifida. These tests are normally done between your third and sixth months...

The second trimester prenatal tests comprise blood tests, genetic screening, and fetal ultrasounds that are done between the third and sixth months of pregnancy to screen for possible conditions or abnormalities in your blood that could affect your baby. These tests also help screen for possible chromosomal disorders (such as Down syndrome and trisomy 18) or other problems such as heart defects or neural tube defects in your baby.
These tests can be done either to screen for or to diagnose any particular disorder.
Your doctor may want to order different second-trimester prenatal tests according to your age, clinical findings, family history, and past medical history. These tests can include:
- Triple or quad screen, the triple screen is made up of three blood tests, and the quad screen adds a fourth blood test. These tests are used to assess your baby's risk of having certain chromosomal abnormalities, including Down syndrome, trisomy 18, and neural tube defects (such as spina bifida).
- Glucose Challenge Test (GCT), a blood test that measures how well your body is able to absorb glucose (sugar) from your regular diet. Usually, this test is performed during the weeks 24-28 of pregnancy.
- Advanced fetal ultrasound, which checks for fetal anatomy, growth, and heart rate. It also evaluates the amniotic fluid level and location of the placenta.
- Fetal echocardiogram, which assesses the flow of blood through your baby's heart chambers.
- Amniocentesis, in which a sample of amniotic fluid, the fluid surrounding your unborn baby, is taken. This test checks for many chromosomal and genetic abnormalities, including Down syndrome, Tay-Sachs disease, and sickle-cell disease. It also checks for neural tube defects. An amniocentesis is done between the 15th and 20th weeks of pregnancy and is not a routine test.
- Cordocentesis, in which a blood sample from the umbilical cord is drawn. This test gives the most accurate diagnosis of Down syndrome during pregnancy, but it can't be done until late in pregnancy, between the 18th and 22nd week. A cordocentesis is not a routine test.
- For the blood tests: a sample of your blood is taken in the usual manner, most often from a vein in your arm. The sample is sent to a lab for testing.
- For the advance fetal ultrasound and fetal echocardiogram: if done through the belly (abdominal ultrasound), a gel is applied to the area and a handheld transducer is run across your lower abdomen. If done vaginally (transvaginal ultrasound), a wand-shaped transducer is covered with a sheath and inserted into your vagina.
- For the amniocentesis: a needle is inserted through your abdomen and into the uterus to draw a small amount of amniotic fluid. Ultrasound is used to help guide the needle.
- For the cordocentesis: a needle is inserted through your abdomen and into the uterus to draw a small amount of blood from the baby’s umbilical cord. Ultrasound is used to help guide the needle.
1. https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=90&contentid=P08956 [accessed on Jan 29, 2019]
2. https://kidshealth.org/en/parents/tests-second-trimester.html [accessed on Jan 29, 2019]
3. https://www.healthline.com/health/pregnancy/second-trimester-checkups-tests#checkup [accessed on Jan 29, 2019]

Maternal Serum Multiple Marker Screen

Maternal Serum Multiple Marker Screen

Also called: Multiple Marker Screening, MMS, Multiple Marker Test, Quad Screen, Triple Screen

A multiple marker test is a blood test for pregnant women. It is used to screen for certain types of birth defects (such as neural tube defects, Down syndrome, and trisomy 18 syndrome).

Maternal Serum Multiple Marker Screen

Also called: Multiple Marker Screening, MMS, Multiple Marker Test, Quad Screen, Triple Screen

A multiple marker test is a blood test for pregnant women. It is used to screen for certain types of birth defects (such as neural tube defects, Down syndrome, and trisomy 18 syndrome).

This blood test provides information about your developing baby. The maternal serum multiple marker test measures at least three markers found in the mother’s blood: alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG) and unconjugated estriol. These substances are made by the developing baby and the placenta. The levels of these markers can be analyzed through a simple blood sample. Certain birth defects can sometimes be detected when the levels of these markers are different than expected. Some laboratories will measure additional chemicals to achieve a higher detection rate for these conditions.
Maternal serum multiple marker test is sometimes called triple test, AFP plus, enhanced AFP, AFP3 test or triple screen prenatal risk profile (PRP). When the blood is being tested for four markers, the test may be called the quad screen or AFP4, etc.
The test is a simple blood test on the mother’s blood and poses no threat to the mother or to her baby.
The test is available to any pregnant woman between 15 and 21 weeks of pregnancy (counting from the first day of the last menstrual period). Your provider may especially recommend the test if you:
- Have a family history of birth defects
- Have diabetes
- Have used medicines or drugs during pregnancy that could harm the baby
If you are 35 or older, your healthcare provider will probably suggest you have an amniocentesis or CVS test instead of or in addition to the maternal serum screening.
Maternal serum multiple marker screening is not a diagnostic test, but a screening test. A positive or abnormal result indicates the need for additional testing, such as ultrasound or amniocentesis. An abnormal test does not necessarily mean there is a definite health problem with the pregnancy. Genetic counseling to discuss this test is recommended.
Elevations in AFP may –
- identify a high percentage of neural tube defects including anencephaly;
- detect a miscalculated due date;
- identify twins or a pregnancy with multiples;
- detect an abnormal opening in the abdominal wall;
- predict risk for preterm delivery;
- determine a low birth weight; or
- represent a normal variation.
If the result is negative or normal, it means that it is unlikely that your baby has a birth defect. However, a normal result doesn't guarantee that you will have a normal pregnancy or baby.
1. Alpha-Fetoprotein (AFP) Test: MedlinePlus Medical Test [accessed on Feb 12, 2024]
2. Determining Your Baby's Risk of Birth Defects. Illinois Department of Public Health. [accessed on Feb 12, 2024]
3. Prenatal Test: Multiple Marker Test (for Parents) - Nemours KidsHealth. Mar 7, 2022 [accessed on Feb 12, 2024]
4. Second Trimester Maternal Serum Screening [accessed on Nov 14, 2018]
5. Second Trimester Maternal Serum Screening Programmes [accessed on Nov 14, 2018]
6. Quad Screen Test - American Pregnancy Association [accessed on Nov 14, 2018]
7. Quad screen - Mayo Clinic [accessed on Nov 14, 2018]
8. Quadruple screen test: MedlinePlus Medical Encyclopedia [accessed on Nov 14, 2018]

Additional Materials (4)

4:34

Prenatal Diagnostic Testing

TheVisualMD

Genes and Genetic Defects

TheVisualMD

Mapping Your Future: Screening for Disease Risk

TheVisualMD

Amniocentesis

TheVisualMD

AFP

Alpha-Fetoprotein (AFP) Screening

Also called: AFP Maternal, Maternal Serum AFP, msAFP screen, AFB

An alpha-fetoprotein (AFP) test that measures the amount of AFP in your blood. AFP levels that are too high or too low during pregnancy may indicate a birth defect in the fetus.

Alpha-Fetoprotein (AFP) Screening

Also called: AFP Maternal, Maternal Serum AFP, msAFP screen, AFB

An alpha-fetoprotein (AFP) test that measures the amount of AFP in your blood. AFP levels that are too high or too low during pregnancy may indicate a birth defect in the fetus.

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Use the slider below to see how your results affect your health.
ng/mL
10
150
Your result is Normal.
AFP is a protein made by your fetus' liver. The protein passes through the placenta and into your blood.
Related conditions
An AFP test is a test that is mainly used to measure the level of alpha-fetoprotein (AFP) in the blood of a pregnant person. The test checks the baby's risk for having certain genetic problems and birth defects. An AFP test is usually done between 15 and 20 weeks of pregnancy.
AFP is a protein that a developing baby makes. Normally, some AFP passes from the baby into the pregnant person's blood. Certain conditions can make a baby's body release more or less AFP. During pregnancy, if your AFP blood levels are higher or lower than normal, it may be sign that:
- The baby has a high risk of having a genetic disorder, such as:
  A neural tube defect, which is a serious condition that causes abnormal development of a developing baby's brain and/or spine.
  Down syndrome, a genetic disorder that causes intellectual disabilities and other health problems.
- Your estimated due date is wrong. AFP levels normally rise and fall at set times during pregnancy, so an abnormal AFP may mean that your baby is due earlier or later than estimated. This is the most common reason for abnormal AFP levels.
- You're pregnant with more than one baby. Each baby makes AFP, so your AFP blood levels will be higher with two or more babies.
Other names: AFP Maternal; Maternal Serum AFP; msAFP screen
If you are pregnant, AFP test is routinely offered between the 15th and 20th week of pregnancy. Your provider may especially recommend the test if you:
- Have a family history of birth defects
- Are 35 years or older
- Have diabetes
- Have used medicines or drugs during pregnancy that could harm the baby
The most common cause for abnormal AFP test results during pregnancy is an error estimating your due date. But a result that isn't normal may also be a sign of possible problems:
- Lower than normal AFP levels may mean your baby has a genetic disorder such as Down syndrome, a genetic disorder that causes intellectual disabilities and health problems.
- Higher than normal AFP levels may mean your baby has an increased risk of having a neural tube defect, such as:
  Spina bifida, a condition in which the bones of the spine don't close around part of the spinal cord
  Anencephaly, a condition in which the brain does not develop properly
High AFP levels may also mean that you are having more than one baby. You may also get a false-positive result. That means that your AFP results aren't normal, but your baby is healthy.
If your AFP test results aren't normal, you will likely have more tests to help make a diagnosis.
AFP tests are often part of a group of prenatal tests called multiple marker or triple screen tests. These tests can help diagnose Down syndrome, trisomy 18 (Edwards syndrome), and other genetic disorders. A triple screen test includes tests for:
- Alpha-fetoprotein (AFP)
- Human chorionic gonadotropin (HCG), a hormone produced by the placenta
- Estriol, a form of estrogen made by the baby and the placenta
In some cases, a fourth test is included, called an inhibin A test, which helps diagnose Down syndrome.
If you have a high risk for having a baby with certain birth defects, your provider may also recommend a test called prenatal cell-free DNA (cfDNA) screening. This is blood test can be done as early as the 10th week of pregnancy. It can show if your baby has a higher chance of having Down syndrome or certain other genetic disorders.
1. Alpha-Fetoprotein (AFP) Test: MedlinePlus Medical Test [accessed on Feb 12, 2024]
2. Adigun OO, Bhimji SS. Alpha Fetoprotein (AFP, Maternal Serum Alpha Fetoprotein, MSAFP) [Updated 2017 Oct 14]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2018 Jan-. [accessed on Oct 03, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (10)

3:25

Newborn Screening: A Personal Story

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9:30

Your Newborn's Health Screening

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2:25

Newborn Screening

Mayo Clinic/YouTube

3:57

Maternal Serum Screening (MSS)

Washington State Department of Health/YouTube

4:51

Anterior Total Hip Replacement- Minimally Invasive Hip Replacement

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2:00

Total Hip Replacement

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8:09

3D Medical Animation: MicroHip, Total Hip Joint Replacement Surgery (THR) by Dr. Markus C. Michel

Microhip/YouTube

1:57

Pancreatic Auto Islet Transplantation with Total Pancreatectomy

Johns Hopkins Medicine/YouTube

Hip replacement

BruceBlaus

1:04

Animation of a Total Heart Transplant

UChicago Medicine/YouTube

E3

Unconjugated Estriol Test

Also called: uE3

Estriol (E3) is a hormone that belongs to a group of steroids called estrogens. E3 is mainly produced by the placenta in pregnant women, and its levels can be unbalanced when abnormalities in the fetus are present. Unconjugated Estriol (UE3) helps screen for maternal-fetal diseases.

Unconjugated Estriol Test

Also called: uE3

Estriol (E3) is a hormone that belongs to a group of steroids called estrogens. E3 is mainly produced by the placenta in pregnant women, and its levels can be unbalanced when abnormalities in the fetus are present. Unconjugated Estriol (UE3) helps screen for maternal-fetal diseases.

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Use the slider below to see how your results affect your health.
ng/mL
4.2
14.9
Your result is Normal.
Your UE3 results are normal. However, reference ranges can vary depending on the gestational age and the method used for testing by the laboratory. Furthermore, it lacks value as a stand-alone result and must be correlated with the other two or three markers (AFP, hCG, and Inhibin A) of a Triple or Quad screen.
Related conditions
1. Estriol Unconjugated Test - Test Results, Normal Range, Cost And More [accessed on Nov 14, 2018]
2. UE3 - Clinical: Estriol, Unconjugated, Serum [accessed on Nov 14, 2018]
3. Low Maternal Serum Unconjugated Estriol During Prenatal Screening as an Indication of Placental Steroid Sulfatase Deficiency and X-Linked Ichthyosis | American Journal of Clinical Pathology | Oxford Academic [accessed on Nov 14, 2018]
4. Second Trimester Maternal Serum Screening [accessed on Nov 14, 2018]
5. Indication of prenatal diagnosis in pregnancies complicated by undetectable second-trimester maternal serum estriol levels [accessed on Nov 14, 2018]
6. DEFINE_ME [accessed on Nov 14, 2018]
7. Second Trimester Maternal Serum Screening Programmes [accessed on Nov 14, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (7)

This browser does not support the video element.

Prenatal Genetic Screening

Prenatal genetic screening tests can play an important role in the development of a healthy fetus. Ideally, parents will undergo a carrier screening before conception. This allows a couple to find out the chances that they will have a child with a certain genetic diseases. Carrier screenings help determine inherited risks such as cystic fibrosis, fragile-x, and spinal muscular atrophy.

Video by TheVisualMD

Estradiol, Estrone, And Estriol, How Do They Differ?

Video by EmpowHER/YouTube

Estriol (E3)

A hydroxylated metabolite of ESTRADIOL or ESTRONE that has a hydroxyl group at C3, 16-alpha, and 17-beta position. Estriol is a major urinary estrogen. During PREGNANCY, a large amount of estriol is produced by the PLACENTA. Isomers with inversion of the hydroxyl group or groups are called epiestriol.

Estrogen Molecule

Medical visualization of an estrogen molecule. Estrogen, as with all of the other main sex hormones, is a steroid hormone derived from cholesterol. Along with progesterone, estrogen is one of the most important female sex hormones. Estrogen production is primarily located in the developing follicles in the ovaries, called the corpus luteum, and the placenta. Another main site of estrogen production is fatty tissue, making weight a contributing factor to the timing of puberty. Smaller amounts are produced by other tissues such as the the breasts, liver, and adrenal glands. Estrogen is responsible for female secondary sexual characteristics such as breast growth, as well as aspects of menstrual cycle regulation, such as the thickening of the endometrium. As with all sex hormones, the effects of estrogen aren't limited to reproduction; estrogen affects bone growth and is involved with learning and memory. Both men and women have all of the main sex hormones, but in very different amounts. Women have much more estrogen than men, but some research suggests that estrogen may be essential for maintenance of the male libido, or sex drive.

Image by TheVisualMD

Estrogens: Pregnancy

Estrone (E1) and estradiol (E2) are the two main estrogens in non-pregnant females, while estriol (E3), produced by the woman's placenta and liver of the fetus, is the main hormone of pregnancy.

Image by TheVisualMD

Embryo and Fetus Development, placenta and amniotic sac.

Embryo and Fetus Development, placenta and amniotic sac. Unconjugated estriol (uE3), a hormone produced by the placenta and the baby

Image by TheVisualMD

Estrogen Molecules

Estrogens are a group of steroids that function as the main female sex hormones. More than 20 forms exist, but the most common forms of estrogens tested are estrone (E1), estradiol (E2), and estriol (E3). Total estrogens are most commonly measured in blood or urine. E1 and E2 are the two main estrogens in non-pregnant females, while E3 is the main pregnancy hormone (Progesterone is another major female hormone that also plays key roles in pregnancy and menstruation). High levels of estrogen may accompany early onset of puberty, tumors of the ovary, hyperthyroidism and cirrhosis (and in males, breast enlargement or tumors of the testes). Low levels of estrogen may be due to hypopituitarism, genetic disorders, pregnancy complications, post menopause or extreme exercise.

Image by TheVisualMD

4:15

Prenatal Genetic Screening

TheVisualMD

3:34

Estradiol, Estrone, And Estriol, How Do They Differ?

EmpowHER/YouTube

Estriol (E3)

Estrogen Molecule

TheVisualMD

Estrogens: Pregnancy

TheVisualMD

Embryo and Fetus Development, placenta and amniotic sac.

TheVisualMD

Estrogen Molecules

TheVisualMD

Amniocentesis

Amniocentesis

Also called: Amnio, Amniotic Fluid Test, AFT, Amniotic Fluid Analysis

Amniocentesis is a test done during pregnancy, usually between weeks 15 and 20. It uses a sample of amniotic fluid to diagnose certain genetic disorders, birth defects, and other health problems in an unborn baby.

Amniocentesis

Also called: Amnio, Amniotic Fluid Test, AFT, Amniotic Fluid Analysis

Amniocentesis is a test done during pregnancy, usually between weeks 15 and 20. It uses a sample of amniotic fluid to diagnose certain genetic disorders, birth defects, and other health problems in an unborn baby.

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Use the slider below to see how your results affect your health.
Your result is Normal.
Normal results are reported as "normal" or "negative." This means that it's very unlikely that your baby has the disorder that was tested, but it does not guarantee your baby will not have any health problems.
Related conditions
{"label":"Chromosome Analysis reference range","description":"The test determines fetal karyotype (collection of chromosomes). It looks at the size, shape, and number of your unborn baby's chromosomes. Chromosomes are parts of cells that contain genes. If the number or structure of your baby's chromosomes is not normal, it can indicate a genetic abnormality.","scale":"lin","step":0.25,"items":[{"flag":"normal","label":{"short":"Normal","long":"Normal","orientation":"horizontal"},"values":{"min":0,"max":1},"text":"A normal or negative result means that there were 46 chromosomes in the sample without any unusual changes in their structure. Normal karyotypes for females contain two X chromosomes and are denoted 46,XX; males have both an X and a Y chromosome denoted 46,XY.","conditions":[]},{"flag":"abnormal","label":{"short":"Abnormal","long":"Abnormal","orientation":"horizontal"},"values":{"min":1,"max":2},"text":"An abnormal or positive result means that unusual changes in the number or structure of chromosomes were found. Abnormal results can mean many things about your baby's health depending on the chromosome changes that were found. Talk with your provider to learn what your results mean.","conditions":["Chromosome abnormalities","Sex chromosome abnormalities","45,X\/46,XY mosaicism","47,XYY syndrome","48,XXXY syndrome","48,XXYY syndrome","49,XXXXY syndrome","Down syndrome (47,XX,+21 or 47,XY,+21)","Edwards syndrome (47,XX,+18 or 47,XY,+18)","Klinefelter syndrome (47,XXY)","Patau syndrome (47,XX,+13 or 47,XY,+13)","Turner syndrome (45,X)"]}],"hideunits":true,"value":0.5}[{"normal":0},{"abnormal":0}]
Use the slider below to see how your results affect your health.
Your result is Normal.
A normal or negative result means that there were 46 chromosomes in the sample without any unusual changes in their structure. Normal karyotypes for females contain two X chromosomes and are denoted 46,XX; males have both an X and a Y chromosome denoted 46,XY.
Related conditions
Amniocentesis is used to diagnose certain health problems in an unborn baby. It is commonly used to find:
- Genetic and chromosomal disorders, including:
  Down syndrome, a disorder that causes delays in physical and mental development and other health problems.
  Cystic fibrosis, a disease of the mucus and sweat glands that causes thick sticky mucus, which can lead to problems with breathing and digestion.
  Sickle cell disease, a group of red blood cell disorders that can cause anemia and other health problems.
  Tay-Sachs disease, a disease that destroys nerve cells, causes mental and physical problems, and often death in early childhood (uncommon).
- Neural tube defects, severe birth defects of the baby's brain and/or spine, such as spina bifida and anencephaly.
The test may also be used to:
- Check your baby's lung development if you have a risk of giving birth too soon (premature birth). In this case, amniocentesis is done later in your pregnancy.
- Diagnose an infection or certain other illnesses in the baby.
Having amniocentesis is your choice. You may want this test if you have a higher risk of having a baby with a health problem. You may have a higher risk if:
- You are age 35 or older; the risk of having a baby with a genetic disorder increases with age
- You had a prenatal screening test that showed your baby might have a problem
- You or your partner have a family history of a genetic disorder or neural tube defect
- You or your partner had genetic testing that showed you carry a genetic disorder
- You or your partner have a child with a genetic disorder or birth defect
Amniocentesis isn't right for everyone. Before you decide to get tested, think about how you might feel and what you might do after learning the results.
The test is usually done between 15 and 20 weeks of pregnancy. It is sometimes done later in pregnancy to check the baby's lung development or diagnose certain infections or illnesses, such as anemia in the unborn baby caused by Rh incompatibility.
During the procedure:
- You'll lie on your back on an exam table.
- Your provider will apply a gel to your belly.
- Your provider will move an ultrasound wand-like device, called a transducer, on your belly. Ultrasound uses sound waves to show the position of your baby and placenta so your provider can see where to take a sample of amniotic fluid.
- Your provider will clean your belly.
- Your provider will insert a thin needle into your belly, withdraw a small amount of amniotic fluid, and then remove the needle.
- When the sample is removed, your provider will check your baby's heartbeat with the ultrasound.
- The sample is sent to a lab for testing. Results may take from a few days to a few weeks.
The procedure usually takes about 15 minutes. Afterward, you may be told not to exercise or have sex for a day or two.
Amniotic fluid may be tested for many different disorders. Your test results will depend on which tests your provider ordered.
- Normal results are reported as "normal" or "negative." This means that it's very unlikely that your baby has the disorder that was tested, but it does not guarantee your baby will not have any health problems.
- Results that are not normal are reported as "abnormal" or "positive." This means that your baby very likely has the disorder that was tested.
Your provider will explain your test results. Amniocentesis is very accurate, but in certain cases, your provider may order more tests to learn about your baby's health.
It may help to speak to a genetic counselor before testing and/or after you get your results. A genetic counselor is a specially trained professional in genetics and genetic testing who can help you understand what your results mean.
1. Amniocentesis (amniotic fluid test): MedlinePlus Medical Test [accessed on Jan 20, 2024]
2. Amniocentesis: MedlinePlus Medical Encyclopedia [accessed on Jan 17, 2019]
3. Diagnosis of Birth Defects | CDC [accessed on Jan 17, 2019]
4. Amniocentesis. Test in pregnancy, amniocentesis information. | Patient [accessed on Jan 17, 2019]
5. Amniocentesis - Health Encyclopedia - University of Rochester Medical Center [accessed on Jan 17, 2019]
6. Amniotic Fluid Analysis [accessed on Jan 17, 2019]
7. Amniocentesis - InsideRadiology [accessed on Jan 17, 2019]
8. Amniocentesis - NHS [accessed on Jan 17, 2019]
9. Amniocentesis - American Pregnancy Association [accessed on Jan 17, 2019]
10. Amniocentesis Procedure [accessed on Jan 17, 2019]
11. Amniocentesis | March of Dimes [accessed on Jan 17, 2019]

Additional Materials (10)

Amniocentesis

TheVisualMD

Amniocentesis Being Performed on Human Pregnancy

TheVisualMD

3:15

Amniocentesis

Obstetrics & Gynecology Associates/YouTube

2:01

Amniocentesis: Pre-Baby Care (Pregnancy Health Guru)

Healthguru/YouTube

4:57

Amniocentesis | Parents

Parents/YouTube

4:34

Prenatal Diagnostic Testing

TheVisualMD

4:38

Genetic Testing During Pregnancy

University of California Television (UCTV)/YouTube

0:49

Amniocentesis.flv

PortalMedicoModerno/YouTube

1:56

Amnio vs. Genetic Blood Testing

Lee Health/YouTube

3:44

Amniocentesis

Washington State Department of Health/YouTube

Glucose Challenge Test

Glucose Challenge Test

Also called: GCT, Gestational Diabetes Screen

The glucose challenge test comprises a series of steps which involve drinking a load of glucose (sugar) to see how the body reacts to it. This test is commonly used to diagnose gestational diabetes in pregnant women without a preexisting diabetes diagnosis.

Glucose Challenge Test

Also called: GCT, Gestational Diabetes Screen

The glucose challenge test comprises a series of steps which involve drinking a load of glucose (sugar) to see how the body reacts to it. This test is commonly used to diagnose gestational diabetes in pregnant women without a preexisting diabetes diagnosis.

A glucose challenge test measures how well your body is able to absorb glucose (sugar) from your regular diet.
In pregnant women GDM diagnosis can be accomplished with either of two strategies:
One-step strategy:
After drinking a syrupy solution containing 75 grams of glucose, your blood glucose levels will be measured at 1 and 2 hours. You must be fasting prior to this test.
The one-step glucose challenge reference ranges and are as follows:
- Fasting blood glucose: normal values are considered to be less than 92 mg/dL (5.1 mmol/L).
- 1 hour after oral glucose intake: normal values are less than 180 mg/dL (10.0 mmol/L).
- 2 hours after oral glucose intake: normal values are less than 153 mg/dL (8.5 mmol/L).
When any of these values are exceeded in pregnant women, the diagnosis of gestational diabetes is made.
Two-step strategy:
Step 1
After drinking a syrupy solution containing 50 grams of glucose, your blood glucose levels will be measured after 1 hour. You don’t need to be fasting prior to this test.
If your blood glucose levels exceed 130 mg/dL (7.2 mmol/L), the second step must be performed.
Step 2
After drinking a syrupy solution containing 100 grams of glucose, your blood glucose levels will be measured at 1, 2, and 3 hours. You must be fasting prior to this test.
- Fasting blood glucose: normal values are considered to be less than 95 mg/dL (5.3 mmol/L).
- 1 hour after oral glucose intake: normal values are less than 180 mg/dL (10.0 mmol/L).
- 2 hours after oral glucose intake: normal values are less than 155 mg/dL (8.6 mmol/L).
- 3 hours after oral glucose intake: normal values are less than 140 mg/dL (7.8 mmol/L).
When at least one (in some cases two) of these values are exceeded in pregnant women, the diagnosis of gestational diabetes is made.
1. https://diabetesed.net/wp-content/uploads/2017/12/2018-ADA-Standards-of-Care.pdf [accessed on Oct 22, 2018]
2. 102277: Gestational Diabetes Screen (ACOG Recommendations) | LabCorp [accessed on Oct 02, 2018]
3. Glucose challenge test - Mayo Clinic [accessed on Oct 22, 2018]
4. 50 Grams Oral Glucose Challenge Test: Is It an Effective Screening Test for Gestational Diabetes Mellitus? [accessed on Oct 22, 2018]

Additional Materials (3)

Baby Development in the Womb

TheVisualMD

1:47

Glucose Challenge Test during Pregnancy | 1mg Lab Test

Tata 1mg/YouTube

1:13

I get a glucose test at my 26 week checkup. What can I eat, and when should I stop eating?

IntermountainMoms/YouTube

Fetal Echocardiogram

Fetal Echocardiogram

Also called: Fetal echo, Fetal echocardiography

A fetal echocardiogram (also called a fetal echo) uses sound waves to check the heart of your unborn baby. It is used to evaluate the position, size, structure, function and rhythm of your baby's heart.

Fetal Echocardiogram

Also called: Fetal echo, Fetal echocardiography

A fetal echocardiogram (also called a fetal echo) uses sound waves to check the heart of your unborn baby. It is used to evaluate the position, size, structure, function and rhythm of your baby's heart.

{"label":"Fetal Echocardiogram Reference Range","scale":"lin","step":0.25,"hideunits":true,"items":[{"flag":"normal","label":{"short":"Normal","long":"Normal","orientation":"horizontal"},"values":{"min":0,"max":1},"text":"Your baby's heart structure, rhythm, and blood flow seems to be within normal parameters.","conditions":[]},{"flag":"abnormal","label":{"short":"Abnormal","long":"Abnormal","orientation":"horizontal"},"values":{"min":1,"max":2},"text":"Possible abnormalities in the fetal heart structure or rhythm were detected. ","conditions":["Fetal cardiac anomalies","Heart defects"]}],"value":0.5}[{"normal":0},{"abnormal":0}]
Use the slider below to see how your results affect your health.
Your result is Normal.
Your baby's heart structure, rhythm, and blood flow seems to be within normal parameters.
Related conditions
You should have this test if any of the following risk factors are present:
- If you or the baby’s father has a congenital heart defect
- If you’ve been exposed to certain dangerous chemicals
- If you have or have had particular diseases (including type I diabetes, lupus, and rubella)
- If you’ve abused drugs or alcohol during pregnancy
- If you’ve taken certain medications
1. https://www.heart.org/en/health-topics/congenital-heart-defects/symptoms--diagnosis-of-congenital-heart-defects/fetal-echocardiogram-test [accessed on Sep 19, 2019]
2. https://www.healthline.com/health/fetal-echocardiography [accessed on Sep 19, 2019]
3. https://www.nationwidechildrens.org/specialties/heart-center-cardiology/services-we-offer/programs/echocardiography/fetal-echo [accessed on Sep 19, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (7)

Fetal Circulation

OpenStax College

Sensitive content

This media may include sensitive content

Photo of a photo

U.S. Air Force photo by Senior Airman Collette Brooks

Vascular remodelling in the embryo

OpenStax College

Ultrasound Transducer

Drickey at English Wikipedia

4:14

What is Echocardiography?

Mayo Clinic/YouTube

25:46

Chapter- 23 of 24 Truncus arteriosus

Echocardiography in Congenital Heart Disease/YouTube

Head-3D

Cordocentesis Test

Cordocentesis Test

Also called: Percutaneous Umbilical Blood Cord Sampling, PUBS, Umbilical Vein Sampling, Fetal Blood Sampling

Cordocentesis, also known as percutaneous umbilical blood sampling, is a diagnostic prenatal test in which a sample of the baby's blood is collected from the umbilical cord for testing. It is used primarily to detect and treat blood conditions.

Cordocentesis Test

Also called: Percutaneous Umbilical Blood Cord Sampling, PUBS, Umbilical Vein Sampling, Fetal Blood Sampling

Cordocentesis, also known as percutaneous umbilical blood sampling, is a diagnostic prenatal test in which a sample of the baby's blood is collected from the umbilical cord for testing. It is used primarily to detect and treat blood conditions.

{"label":"Cordocentesis Reference Range","scale":"lin","step":0.25,"hideunits":true,"items":[{"flag":"normal","label":{"short":"Normal","long":"Normal","orientation":"horizontal"},"values":{"min":0,"max":1},"text":"A normal result means that no chromosomal abnormalities, blood disorders, or infection were detected in your developing baby.","conditions":[]},{"flag":"abnormal","label":{"short":"Abnormal","long":"Abnormal","orientation":"horizontal"},"values":{"min":1,"max":2},"text":"An abnormal result may indicate a chromosomal abnormality, blood disorder, or infection. Talk to your doctor to know what this result means in your baby's specific case.","conditions":["Down syndrome","Edwards syndrome","Patau syndrome","Blood disorders","Fetal anemia","Infection"]}],"value":0.5}[{"normal":0},{"abnormal":0}]
Use the slider below to see how your results affect your health.
Your result is Normal.
A normal result means that no chromosomal abnormalities, blood disorders, or infection were detected in your developing baby.
Related conditions
1. https://medlineplus.gov/lab-tests/down-syndrome-tests/ [accessed on Sep 18, 2019]
2. https://www.mayoclinic.org/tests-procedures/percutaneous-umbilical-blood-sampling/about/pac-20393638 [accessed on Sep 18, 2019]
3. https://www.nichd.nih.gov/health/topics/down/conditioninfo/diagnosis [accessed on Sep 18, 2019]
4. https://www.ncbi.nlm.nih.gov/pubmed/27014852 [accessed on Sep 18, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (7)

Cordiocentesis Being Performed on Human Pregnancy with Placenta towards Front

Cordiocentesis Being Performed on Human Pregnancy with Placenta towards Front

Image by TheVisualMD

3D Visualization of Fetus and Placenta

The placenta is an indispensable but temporary organ that physiologically joins the mother and the developing fetus. This remarkable, shared structure is the centerpiece of the complex dance that takes place between the needs of the mother’s body and the demands of the growing fetus. The placenta’s role is to facilitate the constant exchange of nutrients and wastes, including gases, as well as hormones and key immune factors.

Image by TheVisualMD

Nurture & Protect

As the fetus grows, there is a strict separation of maternal and fetal blood supplies. This is the work of the placenta, which allows maternal and fetal capillaries to intertwine closely enough to allow the exchange of gas, nutrient, and messenger molecules, but keeps them separate enough to prevent the triggering of an immune response. The fetus would be seen as an unwelcome invader by the mom`s immune system. The placenta serves as a traffic cop, making sure that nutrients are delivered to the fetus and wastes removed, but doing its best to keep harmful substances out. Certain pathogens such as the measles virus, and poisons such as heavy metals, drugs, and alcohol do seep through to the fetus, and can impair normal growth and development. In many cases, the timing of the exposure plays a key role in the degree of impact.

Image by TheVisualMD

The Knot close up

Image by andrechinn

Percutaneous umbilical cord blood sampling

Fetus in utero, between fifth and sixth months.

Image by Henry Gray / Gray's Anatomy

Fetal Circulation

Fetal Circulation

Image by OpenStax College

Fetal Circulation

The fetal circulatory system includes three shunts to divert blood from undeveloped and partially functioning organs, as well as blood supply to and from the placenta.

Image by OpenStax College

Cordiocentesis Being Performed on Human Pregnancy with Placenta towards Front

TheVisualMD

3D Visualization of Fetus and Placenta

TheVisualMD

Nurture & Protect

TheVisualMD

The Knot close up

andrechinn

Percutaneous umbilical cord blood sampling

Henry Gray / Gray's Anatomy

Fetal Circulation

OpenStax College

Fetal Circulation

OpenStax College

Second Trimester Ultrasound Scan

Second Trimester Ultrasound Scan

Also called: Fetal Anomaly Scan, Anatomy Scan, TIFFA, Targeted Imaging For Fetal Anomalies, Anatomical Scan, Second trimester anatomy scan

A second trimester anatomy scan is a non-invasive, painless, and risk-free imaging test in which an ultrasound machine is used to assess whether your baby’s growth and development is going as expected for their gestational age.

Second Trimester Ultrasound Scan

Also called: Fetal Anomaly Scan, Anatomy Scan, TIFFA, Targeted Imaging For Fetal Anomalies, Anatomical Scan, Second trimester anatomy scan

A second trimester anatomy scan is a non-invasive, painless, and risk-free imaging test in which an ultrasound machine is used to assess whether your baby’s growth and development is going as expected for their gestational age.

{"label":"Second Trimester Ultrasound Scan Reference Range","scale":"lin","step":0.25,"hideunits":true,"items":[{"flag":"normal","label":{"short":"Normal","long":"Normal","orientation":"horizontal"},"values":{"min":0,"max":1},"text":"Your baby\u2019s development and growth is going as expected, and your placenta is in a normal position. Normal values differ widely depending on your pregnancy week","conditions":[]},{"flag":"abnormal","label":{"short":"Abnormal","long":"Abnormal","orientation":"horizontal"},"values":{"min":1,"max":2},"text":"A problem was detected regarding your baby's growth or organ development. Further testing might be necessary and your healthcare provider will talk to you about the next steps available. ","conditions":["Genetic disorders","Down's syndrome","Cleft Palate","Kidney problems","Heart problems",""]}],"value":0.5}[{"normal":0},{"abnormal":0}]
Use the slider below to see how your results affect your health.
Your result is Normal.
Your baby’s development and growth is going as expected, and your placenta is in a normal position. Normal values differ widely depending on your pregnancy week
Related conditions
Your healthcare practitioner will take several measurements of your baby’s body, such as:
- Biparietal diameter (BPD): measures across your baby’s head.
- Head circumference (HC): measures around your baby’s head.
- Abdominal circumference (AC): measures around your baby’s abdomen (belly).
- Femur length (FL): the femur bone (the only bone in your baby’s thigh) is measured. This parameter can be used to calculate your baby’s length.
Those four measurements, taken together, help estimate your baby's weight and gestational age (how far along the pregnancy is).
The healthcare practitioner will also assess all your baby’s major organs and structures, including:
- Heart
- Brain
- Stomach
- Kidneys
- Bladder
- Sex organs
- Spine
- Limbs
This scan will also look for soft markers, which are features that, in some cases, are related to an increased risk of certain conditions in the fetus, such as Down syndrome or trisomy 18. Some examples of soft markers are an increased nuchal fold (excessive thickness of the fold of skin located at the back of the baby’s neck) and ventriculomegaly (some fluid-filled structures in the brain are too large), among others.
The second trimester anatomy scan can also provide information about your baby's movement, heart rate, breathing, position inside the womb, and their estimated weight and size.
Your placenta's location and the amount of amniotic fluid in your uterus (womb) will also be evaluated.
1. https://radiopaedia.org/articles/second-trimester-ultrasound-scan#:~:text=The%20following%20measurements%20are%20routinely,abdominal%20circumference%20(AC) [accessed on Sep 12, 2020]
2. https://www.healthline.com/health/baby/anatomy-ultrasound#1 [accessed on Sep 12, 2020]
3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5029995/ [accessed on Sep 12, 2020]
4. https://prenatalscreeningontario.ca/en/pso/about-prenatal-screening/detailed-anatomy-ultrasound.aspx [accessed on Sep 12, 2020]
5. https://www.nhs.uk/conditions/pregnancy-and-baby/20-week-scan/ [accessed on Sep 12, 2020]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Week 13

Human Fetus with Skin 13 Week Gestational Age, 11 Week Fetal Age

Image by TheVisualMD

Week 13 of Pregnancy

The fetus is still quite top heavy because the head and brain grow and develop ahead of the rest of the body.

Good news! At the end of this week, you and your rapidly expanding fetus will have reached the end of your first trimester!

Adult lungs are divided into sections: the right lung has three lobes and the left lung has two. Now, at 11 weeks past conception, the fetal lungs have divided into lobes as well.

This week your baby-to-be’s digestive system is in the news, too. The stomach, liver, pancreas, and intestines are all actively developing into their final and functional shapes.

The fetus has been swimming in amniotic fluid for weeks, but now he “breathes” it as well. Your little one has also started urinating into the amniotic fluid—but don’t worry, the urine won’t hurt him. Most waste matter is quickly ushered out of the womb through the umbilical cord and across the placental membrane.

The nose and lips of the fetus are now completely formed. Inside the mouth, the jaws are hardening and are lined with tooth germs, the miniscule buds that will later become baby teeth.

The vocal chords of the larynx (voice box) have begun to form, although not until birth will the baby have an air supply to enable him to make sounds. External genitalia have developed enough to show whether your little one will be a boy or a girl.

The genital tubercle may develop into either a penis or a clitoris.

Boys and girls differ genetically, but in the early stages of development their sex organs are identical. In month 3, a protrusion known as a genital tubercle emerges. If its urethral groove—an opening in its middle—remains open, it becomes a clitoris. If the groove closes, it becomes a penis.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (3)

Human Fetus with Skin 13 Week Gestational Age, 11 Week Fetal Age

Computer generated image reconstructed from scanned human data. Actual size of fetus = 2.5 inches, 0.33 oz. - This image provides a left-sided view of a 11-week-old fetus. The age is calculated from the day of fertilization. The head continues to develop and has acquired a size equal to a third of the body length. The developed external left ear can be seen on the side of the head. Hands and feet extend outward with developed and differentiated fingers and toes. The black striations on the left-side of the fetus indicate the location of the rib cage. The reddish bulbous protrusion extending out of the fetus is the umbilical cord, a transport mechanism for exchanging materials such as nutrients and wastes between mother and fetus.

Image by TheVisualMD

Human Fetus with Skin 13 Week Gestational Age, 11 Week Fetal Age

Computer generated image reconstructed from scanned human data. Actual size of fetus = 2.5 inches, 0.33 oz. - This image provides a left-sided view of a 11-week-old fetus. The age is calculated from the day of fertilization. The head continues to develop and has acquired a size equal to a third of the body length. The developed external left ear can be seen on the side of the head. Hands and feet extend outward with developed and differentiated fingers and toes. The black striations on the left-side of the fetus indicate the location of the rib cage. The reddish bulbous protrusion extending out of the fetus is the umbilical cord, a transport mechanism for exchanging materials such as nutrients and wastes between mother and fetus.

Image by TheVisualMD

The left lung of the fetus (highlighted) has divided into two lobes. Fetus 13 weeks

The left lung of the fetus (highlighted) has divided into two lobes. Fetus 13 weeks

Image by TheVisualMD

Human Fetus with Skin 13 Week Gestational Age, 11 Week Fetal Age

TheVisualMD

Human Fetus with Skin 13 Week Gestational Age, 11 Week Fetal Age

TheVisualMD

The left lung of the fetus (highlighted) has divided into two lobes. Fetus 13 weeks

TheVisualMD

Week 14

Human Fetus 14 Week Gestational Age, 12 Week Fetal Age Inside Amniotic Sac

Image by TheVisualMD

Week 14 of Pregnancy

There’s a tremendous surge in growth this week—the first week of the second trimester.

The fetus begins makes more faces: she frowns, squints, purses her lips, and wrinkles her forehead. She begins to move more, too—kicking, curling her toes, making fists, bending and stretching. This happens as the nervous system integrates with the fetus’s muscular system, and the muscles respond to signals from the brain. As yet, though, these movements lack purpose; there’s no specific correlation between stimulus and response.

This last week has seen an explosion in growth. Your baby’s weight has increased about 60% since week 13. As you begin your second trimester, your fetus is now almost 3.5" (8.7 cm) long and weighs about 1.5 oz (43 g). Week 14 will see an explosion of hair as well. Lanugo, the fine hairs that grow all over the fetus’s body and protect her skin, appear this week.

The placenta is well developed at week 14. It has been providing the vital function of furnishing the fetus with fresh blood and nutrients and removing wastes and deoxygenated blood. Now it also produces hormones vital to the fetus’s growth, including estrogen and progesterone. The placenta acts as a barrier to your own immune system, which would otherwise destroy the fetus as an invader.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Week 16

Human Fetus in Fetal Position 16 Week Gestational Age,14 Week Fetal Age

Image by TheVisualMD

Week 16 of Pregnancy

The fetus is now the size of an avocado.

Your baby-to-be has grown numerous bones at this point, but manyof them are still unconnected. Bones will go on lengthening and ossifying (hardening) throughout your pregnancy. At birth, they will have ossified enough to support your baby’s body, but it will be another year or more before complex joint mechanisms tie them all together so that she has enough strength and flexibility to toddle.

At week 16 your fetus measures about 4.5" (12 cm) in length, about the size of an avocado, and weighs almost 4 oz (110 g).

Movements, like kicking the legs and extending the arms, are more coordinated this week—and there are lots of them, too, even if it’s still too early for you to feel them. Your fetus has started to move her eyes, although they are still sealed shut. And the little one has developed a new, important skill: she can now grasp with her fist, thanks to her opposable thumb, a feature we share with other primates.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (3)

0:08

16 Week Old Fetus

TheVisualMD

Skeletal System of Mother and Fetus

TheVisualMD

Skeletal System of a 14 Week Old (Week 16 Gestational Age, Week 14 Fetal Age) Fetus

TheVisualMD

Week 20

Human Fetus Arm and Leg of a 16-week-old fetus

Image by TheVisualMD

Week 20 of Pregnancy

The skin is now covered with a waxy, protective coating called vernix.

This is a red-letter week. You’re halfway through your pregnancy! Your baby may be over 6" (16 cm) long from crown to rump and weigh more than 11 oz (320 g). If you haven’t felt her movements yet, you are very likely to start feeling them now. You may be able
to see your baby move this week, too, as ultrasound exams are typically scheduled at about this time.

From about now until the last 2 months of pregnancy, the fetus will be growing rapidly in length. The legs and torso are lengthening more rapidly than the arms.

Her skin is now covered completely with waxy, cheesy-looking vernix. It may look unappealing, but the vernix not only protects baby’s thin, delicate skin from the amniotic fluid and from abrasion, but also makes it easier for you to push her out at birth.

The placenta has now reached its maximum thickness. As baby continues to grow, there will be more and more pressure on your lungs, stomach, kidneys, and bladder. You’re probably becoming shorter of breath. You’re processing more air, and your growing baby is pushing up into your diaphragm and lungs. Your belly button will become an “outie” now, if it wasn’t before, as your uterus reaches the level of your navel.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (1)

0:22

20 Week Old Fetus and Placenta

TheVisualMD

Week 22

Arm and Finger of Human Fetus 22 Week Gestational Age, 20 Week Fetal Age

Image by TheVisualMD

Week 22 of Pregnancy

At 22 weeks, arms and legs have reached their final proportions.

Your fetus at last looks like a miniature baby, not a cute little Martian! Twenty weeks since the day your baby was conceived, her limbs have now reached their final proportions. This week your baby’s length will be about 7.5" (19 cm), with a weight of almost 1 lb (460 g). Your baby weighs only about a seventh or an eighth of what she will weigh at birth—there’s still a lot of growing to do.

In boys, the testes have begun to descend from the abdomen. In girls, the uterus and ovaries, complete with immature egg cells (4 million of them!) are in place, and the vagina has developed. Your baby is now covered with fine, downy hair called lanugo, which helps to hold the protective vernix in place.

You can start interacting with your baby! She can now respond to rhythm and melody, so you can sing to her. If you continue to sing the same melodies, she’ll respond to them after she’s born.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (2)

0:10

Fetus at 22 Weeks

TheVisualMD

Fetus at 22 Weeks (Week 24 Gestational Age, Week 22 Fetal Age) with Placenta and Amnion

TheVisualMD

Week 24

Circulatory System of Fetus within Womb

Image by TheVisualMD

Week 24 of Pregnancy

The circulatory system is expanding, especially in the lungs.

Those little lungs are getting ready for that first big breath. Although her entire circulatory system is expanding, the blood vessels of the lungs, in particular, are increasing their development—growing in number and complexity. Your baby’s tiny blood vessels can be seen through her skin, which is still transparent.

The fetal lungs have begun to produce surfactant, a substance that keeps the air sacs in the lungs from collapsing and sticking together when we exhale and allowing easier inflation when we inhale. Lack of sufficient surfactant (along with incomplete structural development) is responsible for infant respiratory distress syndrome in premature babies. With intensive medical care, though, some babies born in this week of development may be able to survive.

All of your fetus’s eye parts have formed. By week 24, the fetus is developing the startle reflex: she will blink in response to a loud noise.

At week 24 she is about 8" (20 cm) from crown to rump and may weigh more than 1 lb, 5 oz (630 g).

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (2)

Circulatory System of a Human Fetus

Circulation operates differently in the fetus. While a fetus is developing in the womb, the lungs never expand and never collect or contain any air. Oxygenated blood comes directly from the mother through the placenta and umbilical cord. In addition, the path of blood through the fetal heart is different from that of an adult. In the fetus, much of the blood that enters the right side of the heart flows directly into the left side of the heart through a valve called the foramen ovale and back out into the body. The remaining blood that flows into the major vessel to the lungs - the pulmonary artery - is still redirected away from the non-functioning lungs. It moves directly from the pulmonary artery through a pathway called the ductus arteriosis into the major vessel to the rest of the body - the aorta. Although the vessels are in place and the four-chambered heart works, until birth, blood circulating through the fetus bypasses the pulmonary circulation entirely.

Image by TheVisualMD

Fetal Development

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Fetal Development at 6 Months

The fetal period begins at the end of the 10th week of gestation (8th week of development). At the start of the fetal stage, the fetus is typically about 30 mm (1.2 inches) in length from crown to rump, and weighs about 8 grams. The head makes up nearly half of the fetus' size. The heart, hands, feet, brain and other organs are present, but are only at the beginning of development and have minimal operation. At 40 days, the embryo begins to curve into a C shape. The heart bulges, further develops, and begins to beat in a regular rhythm. Branchial arches, grooves which will form structures of the face and neck, form. At 56 days, the intestines, liver, kidneys, lungs, and heart are all taking shape. The brain and facial features of the fetus continue to develop. The arms and legs have lengthened, and the hands and feet have digits, but may still be webbed. During the sixth month, the brain is in a period of rapid development and the bones are becoming solid. The fetus is almost fully formed, but the lungs are not yet fully developed. The fetus obtains oxygen and nutrients from the mother through the placenta and the umbilical cord. All major structures are already formed in the fetus, but they continue to grow and develop.

Interactive by TheVisualMD

Circulatory System of a Human Fetus

TheVisualMD

Fetal Development at 6 Months

TheVisualMD

Week 25

Human Fetus with Skin 25 Weeks Gestational age, 24 Weeks Fetal age

Image by TheVisualMD

Week 25 of Pregnancy

Sharpening senses mean the fetus is reacting more to outside stimuli, especially sound.

The ears have completed their long journey from the base of the neck to the side of the head. Other parts of your baby are now fully developed—like his hands, which are tiny but perfectly formed. The nerve connections to the brain that will make those hands nimble are still to come.

The baby’s cerebral cortex—the part we usually think of when we picture the brain—is now the primary visible structure. This region of the brain is responsible for memory, awareness, thought, and language. As it develops, it will continue to add numerous irregular folds and wrinkles. This augments the amount of usable area in the brain and enhances communication between the brain cells.

As his nervous system and brain develop and his senses sharpen, your baby is probably reacting more and more to stimuli from outside the womb, especially sounds. Loud noises may stimulate a bout of kicking and squirming. If you could see him, he might even be putting his tiny hands over his ears!

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (1)

0:20

Fetus Facial Profile

TheVisualMD

Week 26

Fetus at Week 26

Image by TheVisualMD

Week 26 of Pregnancy

Your fetus can now hear sounds both inside and outside your body.

Those big baby eyes are getting ready to open! The eyelids, which have been fused shut to protect the delicate developing retina, are just starting to unfuse.

Your baby can now also taste and smell. Studies have shown that sweet substances inserted into the amniotic fluid cause baby to swallow more, but bitter substances make her swallow less. And there are plenty of things for her to taste. The things you eat (garlic, for instance) actually “flavor” the amniotic fluid.

Even now, the fetal lungs are amazingly well developed. Terminal sacs now appear; later on they’ll become alveoli, the tiny air sacs that allow the lungs to exchange carbon dioxide for oxygen.

Baby is now about 9" (23 cm) long and weighs nearly 2 lbs (820 g). Her skin is loose and wrinkly at this point, allowing plenty of room for the fat that will accumulate underneath it in the third trimester. And, speaking of future developments: baby’s brain now takes off on a major growth spurt, one that will consume more than 50% of the energy she uses!

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (5)

Left Eye of 26 Week (Week 28 Gestational Age, Week 26 Fetal Age) Old Fetus

Computer generated image reconstructed from scanned human data. Actual size of fetus = 360 mm. This image presents a frontal view of the left eye of a 26-week-old fetus. The age is calculated from the day of fertilization. The pigmented left eye is partially open. The ridge-like markings around the eyes are the eyelids. During the 26th week of development, the fetus gains the ability to open its eyes while alert and close its eyes while sleeping. Eye color is usually blue, regardless of the permanent color, as pigmentation is not fully developed. Final formation of eye pigmentation requires exposure to light and usually occurs a few weeks after birth.

Image by TheVisualMD

Fetus 26 Week (Week 28 Gestational Age, Week 26 Fetal Age) Old Passing Through Birth Canal

Computer generated image reconstructed from scanned human data of a fetus traversing the birth canal. Actual size of fetus (crown to rump) = 360 mm - This image presents a left-side view of a 26-week-old fetus. At this stage of development, the central nervous system is developed enough to control breathing and body temperature. Lungs are capable of breathing air, and babies born now often survive. The skin of the fetus has been given a translucent appearance so that the developed internal structures may be observed. The skeletal structure - the skull, vertebrae, and bones found in the arms and legs - are highlighted in white. The heart is marked in bright red and to its right in the image, the liver, is highlighted in a slightly darker shade of red. Noticeable also is the enlarged forebrain. The mother's skeletal structure (vertebrae and pelvis) surrounds the fetus in a faint gold color.

Image by TheVisualMD

This browser does not support the video element.

Eye Development from Embryo to Fetus

Close-up view of the development of an embryo's eye at Carnegie stage 16, about 40 days. At this stage, the eye is distinct and heavily pigmented. A morph occurs and shows the eye developing into an eye of fetus at 8 months. During the morph, eyelids developed and approximated one another to cover the eyeball.

Video by TheVisualMD

Right Ear of 24 Week (Week 26 Gestational Age, Week 24 Fetal Age) Old Fetus

Computer generated image reconstructed from scanned human data. This image presents a right-sided view of the external ear of the 24-week-old fetus. The age is calculated from the day of fertilization. A vein running alongside the head can be seen in red. At this point of development, eyes respond to light, while ears respond to sounds originating from outside the womb.

Image by TheVisualMD

24 Week Old (Week 26 Gestational Age, Week 24 Fetal Age) Fetus Skeletal System

Computer generated image reconstructed from scanned human data. Actual size of fetus 10+ inches. This image presents a right-sided, frontal view of a 24-week-old fetus. The age is calculated from the day of fertilization. The image has been manipulated so that the skin appears reddish and translucent so as to focus on the skeletal system, highlighted in white. The vertebrae and the rib cage are see outlined in the torso. The spine, which is made up of about 150 joints and 1,000 ligaments is visible.

Image by TheVisualMD

Left Eye of 26 Week (Week 28 Gestational Age, Week 26 Fetal Age) Old Fetus

TheVisualMD

Fetus 26 Week (Week 28 Gestational Age, Week 26 Fetal Age) Old Passing Through Birth Canal

TheVisualMD

0:05

Eye Development from Embryo to Fetus

TheVisualMD

Right Ear of 24 Week (Week 26 Gestational Age, Week 24 Fetal Age) Old Fetus

TheVisualMD

24 Week Old (Week 26 Gestational Age, Week 24 Fetal Age) Fetus Skeletal System

TheVisualMD

Week 27

Fetus 27 Week (Week 27 Gestational Age, Week 25 Fetal Age) Old Above Pelvic Canal

Image by TheVisualMD

Week 27 of Pregnancy

The fetus in the mother’s pelvis.

You’ve reached the end of the second trimester, and what an incredible period of development it’s been! Your baby has been growing like a weed: he may have tripled in length since he was 14 weeks old.

Baby’s skeleton is fully assembled but not yet connected at the joints. The bones are able to prop up the fetus structurally, though, allowing him to twist and move around in the uterus. Your pelvis provides a bony cradle, supporting and protecting your baby and the amniotic sac that encases him.

Muscle coordination is now such that your baby can suck his thumb. Don’t worry, that’s a good thing: sucking his thumb calms the little one and strengthens his jaw and cheek muscles in preparation for feeding. The lungs, liver, and immune system are continuing
to develop.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (1)

0:06

Fetus in Mother's Bone Structure (Week 27)

TheVisualMD

Week 28

This baby-to-be may look peaceful, but  at week 28 a fetus can deliver a good  solid kick!

Image by TheVisualMD

Week 28 of Pregnancy

This baby-to-be may look peaceful, but at week 28 a fetus can deliver a good solid kick!

You can breathe easier now, at this, the start of your third trimester. A baby born this week has a 90% chance of surviving with no lasting health problems.

The fetal eyes are now highly developed, with retinas that contain nerve cells called rods and cones. Rods permit vision in low levels of light, while cones produce sharp images and allow us to see color. So your baby is now sensitive to different levels of brightness, as some light does penetrate through your abdomen and into the womb.

The irises in babies’ eyes are usually blue, brown, or dark gray at birth, depending on race. Many blue and gray eyes change color in the months following birth, though, because the final formation of eye pigmentation requires exposure to light.

Right now your ever-growing baby may be nearly 10" (25 cm) long from crown to rump, about the length of an eggplant, and weigh almost 2 lbs, 4 oz (1,000 g).

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (2)

0:14

Eye of Fetus in Utero

TheVisualMD

Left Eye of 26 Week (Week 28 Gestational Age, Week 26 Fetal Age) Old Fetus

TheVisualMD

Third Trimester

Human Newborn with Visible Heart and Lung

Image by TheVisualMD

Human Newborn with Visible Heart and Lung

The lungs of an unborn child are one of the last organs to complete development. This is, in part, due to the fact that the lungs are not needed during pregnancy. The fetus exists in a fluid-filled womb and receives oxygenated blood from the mother. However, at birth, as soon as that first breath of air rushes into a baby's lungs, there is a drastic increase in the amount of blood flowing through the lungs. In the fetus, blood flows directly into the left side of the fetal heart. Yet, at birth, after the baby takes the first breath, all the blood that is pumped from the right side of the heart now must pass through the lungs to be oxygenated. After the first breath, the foramen ovale (the opening between the right and left sides of the heart) seals up and the right ventricle pumps the blood through the pulmonary artery into the lungs. The ductus arteriosis also closes, so that when the oxygenated blood returns to the left side of the heart from the lungs, the left ventricle pumps the blood through the aorta out to the rest of the body. A healthy newborn baby is rosy and pink, flushed with red oxygenated blood flowing under the skin. Deoxygenated blood flows into the right atrium, past the sealed foramen ovule, and into the right ventricle, where it is sent on its path for oxygenation. It makes its way through the pulmonary artery, and goes straight past the closed-off ductus arteriosis to pick up oxygen from the lungs. The oxygen-rich, red blood then returns to the left atrium of the heart through the pulmonary vein, which shoots it into the left ventricle to be pumped through the aorta and out to the rest of the body. The blood goes out through the arteries, moves into the capillaries, and returns to the heart through the venules and veins. It follows the path of circulation that it will travel throughout one's lifetime, until the day the body dies.

Image by TheVisualMD

Third Trimester (Week 29–Week 40)

You're in the home stretch! Some of the same discomforts you had in your second trimester will continue. Plus, many women find breathing difficult and notice they have to go to the bathroom even more often. This is because the baby is getting bigger and it is putting more pressure on your organs. Don't worry, your baby is fine and these problems will lessen once you give birth.

Some new body changes you might notice in the third trimester include:

Shortness of breath
Heartburn
Swelling of the ankles, fingers, and face. (If you notice any sudden or extreme swelling or if you gain a lot of weight really quickly, call your doctor right away. This could be a sign of preeclampsia.)
Hemorrhoids
Tender breasts, which may leak a watery pre-milk called colostrum (kuh-LOSS-struhm)
Your belly button may stick out
Trouble sleeping
The baby "dropping", or moving lower in your abdomen
Contractions, which can be a sign of real or false labor

As you near your due date, your cervix becomes thinner and softer (called effacing). This is a normal, natural process that helps the birth canal (vagina) to open during the birthing process. Your doctor will check your progress with a vaginal exam as you near your due date. Get excited — the final countdown has begun!

Your developing baby

Third trimester (week 29-week 40)

At 32 weeks:

Your baby's bones are fully formed, but still soft.
Your baby's kicks and jabs are forceful.
The eyes can open and close and sense changes in light.
Lungs are not fully formed, but practice "breathing" movements occur.
Your baby's body begins to store vital minerals, such as iron and calcium.
Lanugo begins to fall off.
Your baby is gaining weight quickly, about one-half pound a week. Now, your baby is about 15 to 17 inches long and weighs about 4 to 4½ pounds.

At 36 weeks:

The protective waxy coating called vernix gets thicker.
Body fat increases. Your baby is getting bigger and bigger and has less space to move around. Movements are less forceful, but you will feel stretches and wiggles.
Your baby is about 16 to 19 inches long and weighs about 6 to 6½ pounds.

Weeks 37-40:

At 39 weeks, your baby is considered full-term. Your baby's organs are ready to function on their own.
As you near your due date, your baby may turn into a head-down position for birth. Most babies "present" head down.
At birth, your baby may weigh somewhere between 6 pounds 2 ounces and 9 pounds 2 ounces and be 19 to 21 inches long. Most full-term babies fall within these ranges. But healthy babies come in many different sizes.

Source: Office on Women's Health (OWH), U.S. Department of Health and Human Services

Additional Materials (5)

Pregnant Woman and Fetal Development, 0 months, 5 months, 9 Months

TheVisualMD

46:39

Welcome to The Home Stretch- Third Trimester!

St. Louis Children's Hospital/YouTube

5:02

Third Trimester Pregnancy: Everything You Need to Know

MountainStar Health/YouTube

1:57

Your Growing Baby's Changes in the Third Trimester

WebMD/YouTube

2:47

Glucose Tolerance Test (Obstetrics - Third Trimester)

Med Twice/YouTube

Third Trimester Prenatal Tests

Third Trimester Prenatal Tests

Third-trimester prenatal tests help assess the overall fetus well-being and also screens for Group B strep, a type of bacterium that can be normally found in the vagina and rectum of pregnant women, and which can be harmful to the baby if he or she gets infected during birth.

Third Trimester Prenatal Tests

Third-trimester prenatal tests help assess the overall fetus well-being and also screens for Group B strep, a type of bacterium that can be normally found in the vagina and rectum of pregnant women, and which can be harmful to the baby if he or she gets infected during birth.

Third trimester prenatal tests comprise several tests that are performed during late pregnancy to monitor the fetus's health, oxygen supply, and lung maturity. It also screens for the presence of Streptococcus agalactiae, a type of bacteria that can be found in the intestines or lower genital tract of most adults, and which can pose a serious threat to unborn babies.
Your doctor may want to order one or more third-trimester prenatal tests according to your age, clinical findings, family history, and past medical history. These tests can include:
- Nonstress test (NST), during this test, two belts are placed around your belly to see if the baby's heart rate goes faster while resting or moving. This can help determine if the baby is getting enough oxygen.
- Biophysical profile (BPP), which is a combination of the nonstress test and a special ultrasound exam. It is done to monitor for fetal well-being.
- Contraction Stress Test (CST), which is used to monitor your baby’s heart rate after you have been induced to have mild contractions. This test is done to assess how well your baby will react to the stress of contractions during actual labor.
- Late amniocentesis, in which a sample of amniotic fluid, the fluid that surrounds your unborn baby, is taken. It is usually done between weeks 32 and 39 of pregnancy. This test checks for fetal well-being and fetal lung maturity if a baby is expected to arrive early.
- Group B Strep (GBS) screening test, in which a sample of cells and secretions from your vagina and rectum is taken. This is done to screen for Streptococcus agalactiae, a type of bacteria that can cause complications during pregnancy and, rarely, serious illness in newborns.
- For the nonstress test: two belts are attached to your waist: one to monitor the fetal heart rate and another to measure your spontaneous uterine contractions. This test lasts for 20-40 minutes.
- For the biophysical profile: this comprises a nonstress test and an ultrasound. During the ultrasound part of the exam, a gel is applied to the abdominal area and a handheld transducer is run across your lower abdomen.
- For the contraction stress test: two belts are attached to your waist: one to monitor the fetal heart rate and another to measure your uterine contractions. Then, your doctor will induce you to have mild contractions.
- For the late amniocentesis: a needle is inserted through your abdomen and into the uterus to draw a small amount of amniotic fluid. Ultrasound is used to help guide the needle.
- For the Group B Strep screening test: sterile cotton-tipped swabs are used to collect samples of cells and secretions from your vagina and rectum. In some cases, you might be instructed on how to collect the samples yourself.
1. https://www.webmd.com/baby/guide/third-trimester-tests [accessed on Jan 29, 2019]
2. https://www.webmd.com/baby/prenatal-tests-3rd-trimester [accessed on Jan 29, 2019]
3. https://kidshealth.org/en/parents/tests-third-trimester.html [accessed on Jan 29, 2019]
4. https://www.brennerchildrens.org/KidsHealth/Parents/Doctors-and-Hospitals/Medical-Tests-and-Exams/Prenatal-Tests-Third-Trimester.htm?__t=778 [accessed on Jan 29, 2019]

Nonstress Test

Nonstress Test

Also called: NST, Non-Stress Test, Fetal Nonstress Test, Nonstress Test

A nonstress test measures fetal heart rate as a baby moves in a mother's uterus. In most healthy babies, the heart rate increases during movement. If your nonstress test results are not normal, you may need more testing or treatment or to have delivery induced.

Nonstress Test

Also called: NST, Non-Stress Test, Fetal Nonstress Test, Nonstress Test

A nonstress test measures fetal heart rate as a baby moves in a mother's uterus. In most healthy babies, the heart rate increases during movement. If your nonstress test results are not normal, you may need more testing or treatment or to have delivery induced.

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Use the slider below to see how your results affect your health.
Your result is Reactive.
A reassuring or reactive NST means the fetus’ heart rate accelerates (increases) when it moves or when you have a contraction. This is a normal result.
Related conditions
Not all pregnant people need a nonstress test. But you may need this test if:
- Your baby doesn't seem to be moving as much as usual.
- Your pregnancy is overdue (at 42 weeks or beyond).
- You have a chronic medical condition that makes your pregnancy high risk, such as high blood pressure, diabetes, heart disease, or a clotting disorder.
- You had complications in a previous pregnancy.
- Your blood is Rh negative, and your baby's is Rh-positive, which is called Rh incompatibility. This condition can cause your immune system to attack your baby's red blood cells.
- You are having more than one baby (twins, triplets, or more).
The test may be done in your provider's office or a hospital's prenatal area. It generally includes the following steps:
- You will lie on a reclining chair or exam table.
- Your provider will spread a special gel on the skin over your abdomen (belly).
- Your provider will attach two belt-like devices around your abdomen. One will measure your baby's heartbeat. The other will record your contractions.
- Your provider will move the device over your abdomen until the baby's heartbeat is found.
- The baby's heart rate will be recorded on a monitor, while your contractions are recorded on paper.
- You may be asked to press a button on the device each time you feel your baby move. This allows your provider to record the heart rate during movement.
- The test usually lasts about 20 minutes to 30 minutes.
- If your baby isn't active or moving during that period, they may be asleep. To wake up the baby, your provider may place a small buzzer or other noisemaker over your abdomen. This won't harm the baby but it may help a sleepy baby become more active. Your baby may also wake up if you have a snack or sugary drink.
- Your provider will remove the belts. They will likely review the results with you soon after the test.
The procedure is very safe. It's called a "nonstress" test because no stress, or risk, is placed on the baby during the test.
Nonstress test results are given as one of the following:
- Reactive or Reassuring. This means your baby's heart rate increased two or more times during the testing period.
- Nonreactive. This means your baby's heartbeat didn't increase when moving or the baby wasn't moving much.
A nonreactive result doesn't always mean your baby has a health problem. Your baby may have been asleep and not easily awoken. Nonreactive results may also be caused by certain medicines taken during pregnancy. But if the result was nonreactive, your provider will probably take more tests to find out if there is cause for concern. If your baby is found to be at risk, you may need treatment or monitoring, or to have labor induced if it is late enough in your pregnancy.
If you have questions about your results, talk to your provider.
Additional noninvasive tests to check your developing baby's heart rate and health can include:
- Biophysical profile. This test combines a nonstress test with an ultrasound. An ultrasound imaging test uses sound waves to create a picture. The ultrasound checks your baby's breathing, muscle tone, and amniotic fluid level.
- Contraction stress test. This test checks how your baby's heart reacts when your uterus contracts. To make your uterus contract, you may be asked to rub your nipples through your clothing or may be given a medicine called oxytocin, which can cause contractions.
These tests pose no known risks to you or your baby.
1. Nonstress Test: MedlinePlus Medical Test [accessed on Sep 29, 2024]
2. Monitoring your baby before labor: MedlinePlus Medical Encyclopedia [accessed on Jan 10, 2019]
3. Nonstress test - Mayo Clinic [accessed on Jan 17, 2019]
4. Nonstress Test (NST) [accessed on Jan 17, 2019]
5. Nonstress and Contraction Stress Testing | GLOWM [accessed on Jan 17, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (8)

Non Stress Test - Fetal Heart Beat

Ultrasound with heartbeat at 13 weeks

Image by Marcel Berteler

Circulatory System of a Human Fetus

Circulation operates differently in the fetus. While a fetus is developing in the womb, the lungs never expand and never collect or contain any air. Oxygenated blood comes directly from the mother through the placenta and umbilical cord. In addition, the path of blood through the fetal heart is different from that of an adult. In the fetus, much of the blood that enters the right side of the heart flows directly into the left side of the heart through a valve called the foramen ovale and back out into the body. The remaining blood that flows into the major vessel to the lungs - the pulmonary artery - is still redirected away from the non-functioning lungs. It moves directly from the pulmonary artery through a pathway called the ductus arteriosis into the major vessel to the rest of the body - the aorta. Although the vessels are in place and the four-chambered heart works, until birth, blood circulating through the fetus bypasses the pulmonary circulation entirely.

Image by TheVisualMD

Fetal Heart Rate Tone Monitoring Decelerations | Early, Late, Variable NCLEX OB Maternity Nursing

Video by RegisteredNurseRN/YouTube

Fetal Heart Monitoring & OB Nursing

Video by Simple Nursing/YouTube

Prostate Cancer

Imaging and Radiation in Prostate Cancer: Radiation treatment is one of the major treatment options for prostate cancer. University of Chicago's radiation oncologist Dr. Stanley Liauw explains the crucial role imaging plays in the planning and execution of radiation treatment for prostate cancer.

Image by TheVisualMD

Cancers Associated with Overweight and Obesity

People who are obese may have an increased risk of several types of cancer, including cancers of the breast (in women who have been through menopause), colon, rectum, endometrium (lining of the uterus), esophagus, kidney, pancreas, and gallbladder.

Image by National Cancer Institute (NCI)

Alcohol causes 7 types of cancer

Drinking less alcohol could prevent 12,800 cancer cases per year in the UK. Based on a Cancer Research UK graphic published in 2014: http://www.cancerresearchuk.org/cancer-info/healthyliving/alcohol/alcohol-and-cancer Original sources: cruk.org, 2014 (data from 2011); Parkin et al, BJC, 2011;

Image by Cancer Research UK/Wikimedia

National Trends in Cancer Death Rates

Among men between 2012 and 2016, death rates for non-melanoma skin cancer had the highest increase. Melanoma had the highest decrease. For women, death rates for corpus and uterus cancer had the highest increase, and melanoma had the highest decrease.

Image by National Cancer Institute (NCI)

Non Stress Test - Fetal Heart Beat

Marcel Berteler

Circulatory System of a Human Fetus

TheVisualMD

10:44

Fetal Heart Rate Tone Monitoring Decelerations | Early, Late, Variable NCLEX OB Maternity Nursing

RegisteredNurseRN/YouTube

7:00

Fetal Heart Monitoring & OB Nursing

Simple Nursing/YouTube

Prostate Cancer

TheVisualMD

Cancers Associated with Overweight and Obesity

National Cancer Institute (NCI)

Alcohol causes 7 types of cancer

Cancer Research UK/Wikimedia

National Trends in Cancer Death Rates

National Cancer Institute (NCI)

Biophysical Profile

Biophysical Profile

Also called: BPP, BPP Score

A biophysical profile (BPP) is a prenatal ultrasound evaluation of fetal well-being, often combined with a nonstress test. Biophysical profile testing is usually performed in the last trimester of pregnancy.

Biophysical Profile

Also called: BPP, BPP Score

A biophysical profile (BPP) is a prenatal ultrasound evaluation of fetal well-being, often combined with a nonstress test. Biophysical profile testing is usually performed in the last trimester of pregnancy.

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Use the slider below to see how your results affect your health.
score
6
8
Your result is Normal.
A score between 8 and 10 is considered normal.
Related conditions

Each BPP component is assigned a score of 2 or 0. The numbers are then tallied for a final score from 0 to 10. A score of 8-10 is normal, 6 is borderline, and a score below 6 is of concern.
BPP Component	Normal (2 Points)	Abnormal (0 Points)
Breathing	1 breathing episode in 30 min	No breathing episodes in 30 min
Movement	>2 movements in 30 min	2 movements in 30 min
Muscle Tone	>1 active extension/flexion of limb/hand	Slow extension/flexion of limb/hand
Heart Rate	>2 episodes of rate acceleration in 20 min	>1 episode unreactive rate acceleration
Amniotic Fluid	1 or more pockets of fluid	Absent or inadequate pockets of fluid

1. Monitoring your baby before labor: MedlinePlus Medical Encyclopedia [accessed on Jan 10, 2019]
2. [accessed on Jan 17, 2019]
3. Biophysical Profile - Health Encyclopedia - University of Rochester Medical Center [accessed on Jan 10, 2019]
4. Biophysical Profile (BPP) [accessed on Jan 10, 2019]
5. Biophysical profile - Mayo Clinic [accessed on Jan 17, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Strep B Test

Strep B Test

Also called: GBS Testing, Group B Streptococcus Test, Group B Strep

Strep B is a type of bacteria that is usually harmless in adults but can be very serious in newborns. A group B strep test is most often used to check for bacteria in pregnant people.

Strep B Test

Also called: GBS Testing, Group B Streptococcus Test, Group B Strep

Strep B is a type of bacteria that is usually harmless in adults but can be very serious in newborns. A group B strep test is most often used to check for bacteria in pregnant people.

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Use the slider below to see how your results affect your health.
Your result is Negative.
streptococcus was not found in your sample.
Related conditions
Strep B, also known as group B strep (GBS), is a type of bacteria commonly found in the digestive tract, urinary tract, and genital area. Many healthy people have GBS bacteria in their bodies.
Most of the time, GBS bacteria are not harmful and do not make people feel sick or have any symptoms. But in rare cases, these bacteria cause certain infections, known as GBS disease. This is more likely in people who are age 65 and older, have certain chronic health problems, or have a condition that weakens their immune system. And sometimes GBS infections can be very serious, or even life-threatening, in newborns.
In most cases, it is not known how people spread GBS bacteria to others. However, it is known that pregnant people can pass the bacteria to their babies during a vaginal delivery. GBS is usually found in the vagina and rectum, so. the baby can be exposed to the GBS bacteria during labor. It is rare, but it can cause serious illness in the baby.
There are two types of GBS infections in babies. The types are based on the age of the infant when signs and symptoms begin to show:
- In early-onset GBS disease, the signs and symptoms start during the first six days of life
- In late-onset GBS disease, the signs and symptoms start during between 7 to 89 days of life. The source of late-onset GBS infection is unknown.
In newborns, GBS can cause:
- Bacteremia (infection in the bloodstream)
- Pneumonia (inflammation of the lung)
- Meningitis (inflammation of the thin tissue that surrounds the brain and spinal cord)
- Other serious illnesses
GBS bacteria are a leading cause of meningitis and bloodstream infections in a newborn's first three months of life.
In pregnant people, GBS can cause:
- Bacteremia
- Chorioamnionitis (infection of the placenta and amniotic fluid)
- Endometritis (infection of the membrane lining the uterus)
- Urinary tract infections
In older adults and people with chronic health conditions, GBS bacteria can cause:
- Bacteremia
- Urinary tract infection
- Pneumonia
- Bone and joint infections
- Endocarditis (infection of the heart valves)
- Meningitis
- Skin or soft-tissue infections
A group B strep test checks for GBS bacteria. If the test shows that a pregnant person has GBS, taking antibiotics during labor can protect the baby from infection.
Other names: group B streptococcus, group B beta-hemolytic streptococcus, Streptococcus agalactiae, beta-hemolytic strep culture
You may need a strep B test if you are pregnant. The American College of Obstetricians and Gynecologists recommends GBS testing for all pregnant people. Testing is usually done between 36 and 38 weeks of pregnancy. If you go into labor earlier than 36 weeks, you may be tested at that time.
Symptoms depend on the part of the body that is infected. Symptoms of GBS disease are different in newborns compared to people of other ages who get GBS disease. Most newborns who get sick in the first week of life (early onset) have symptoms on the day of birth. In contrast, babies who develop disease later (late onset) can appear healthy at birth and during their first week of life.
A baby may need a group B strep test if he or she has symptoms of infection. These include:
- High fever
- Trouble with feeding
- Trouble breathing
- Lack of energy (hard to wake up)
- Irritability
- Blue-ish skin color
- Unstable blood pressure (a pattern where the blood pressure suddenly spikes and then falls back to normal)
- Kidney problems
Pregnant people usually do not feel sick or have any symptoms. In adults, symptoms depend on the infection caused by GBS.
Symptoms of bacteremia include:
- Fever
- Chills
- Low alertness
Symptoms of pneumonia include:
- Fever
- Chills
- Cough
- Rapid breathing or trouble breathing
- Chest pain
Skin and soft tissue infections often appear as a bump or infected area on the skin that may be:
- Red
- Swollen or painful
- Warm to the touch
- Full of pus or other drainage
- Fever, in some cases
Bone and joint infections often appear as pain in the infected area and might also include:
- Fever
- Chills
- Swelling
- Stiffness or being unable to move the affected joint(s)
If you are pregnant, your health care provider may order a swab test or a urine test.
For a swab test, you will lie on your back on an exam table. Your provider will use a small cotton swab to take a sample of cells and fluids from your vagina and rectum.
For a urine test, a health care professional may give you a cleansing wipe, a small container, and instructions for how to use the "clean catch" method to collect your urine sample. It's important to follow these instructions so that germs from your skin don't get into the sample:
- Wash your hands with soap and water and dry them.
- Open the container without touching the inside.
- Clean your genital area with the cleansing wipe:
- For a penis, wipe the entire head (end) of the penis. If you have a foreskin, pull it back first.
- For a vagina, separate the labia (the folds of skin around the vagina) and wipe the inner sides from front to back.
- Urinate into the toilet for a few seconds and then stop the flow. Start urinating again, this time into the container. Don't let the container touch your body.
- Collect at least an ounce or two of urine into the container. The container should have markings to show how much urine is needed.
- Finish urinating into the toilet.
- Put the cap on the container and return it as instructed.
If your baby needs testing, a provider may do a blood test or a lumbar puncture (spinal tap).
For a blood test, a health care professional will use a small needle to take a blood sample from your baby's heel. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. Your baby may feel a little sting when the needle goes in or out.
A lumbar puncture, also known as a spinal tap, is a test that collects and looks at spinal fluid, the clear liquid that surrounds the brain and spinal cord. During the procedure:
- A nurse or other provider will hold your baby in a curled-up position.
- A provider will clean your baby's back and inject an anesthetic into the skin, so your baby won't feel pain during the procedure. The provider may put a numbing cream on your baby's back before this injection.
- The provider may also give your baby a sedative and/or pain reliever to help him or her better tolerate the procedure.
- Once the area on the back is completely numb, your provider will insert a thin, hollow needle between two vertebrae in the lower spine. Vertebrae are the small backbones that make up the spine.
- The provider will withdraw a small amount of cerebrospinal fluid for testing. This will take about five minutes.
The provider may also order a chest X-ray to help determine if someone has GBS disease.
1. Strep B Test: MedlinePlus Medical Test [accessed on Mar 24, 2024]
2. GBS | Prevention in Newborns | Group B Strep | CDC [accessed on Nov 19, 2018]
3. Group B strep test - Mayo Clinic [accessed on Nov 19, 2018]
4. Group B Streptococcus screening – Pregnancy Info [accessed on Nov 19, 2018]
5. Group B Strep Infection: GBS - American Pregnancy Association [accessed on Nov 19, 2018]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Additional Materials (34)

Real Questions | Pregnancy and Strep | UCLA OB/GYN

Video by UCLA Health/YouTube

Study Reveals New Mechanism Fueling Group B Strep Infection

Video by Seattle Children's/YouTube

What is a Group B Strep Test?

Video by University of California Television (UCTV)/YouTube

Chronic Health Conditions: Prescription Medicines and Pregnancy

Video by March of Dimes/YouTube

Streptococcus pyogenes

Magnified 100x, this 1977 photograph depicted a Petri dish filled with trypticase soy agar medium, containing 5% defibrinated sheep's blood. After having been inoculated by streaking the surface with Group A Streptococcus pyogenes (GAS) bacteria, the dish was incubated in a carbon dioxide enriched atmosphere at 35oC for 24 hours. The characteristic color changes, including a light colored halo surrounding each colony, indicated that these bacteria were beta-hemolytic in nature.

Image by CDC/ Richard R. Facklam, Ph.D.

Strep Throat - Causes and Spread

A throat infected with group A streptococcus.

Image by James Heilman, MD

Streptococcus Pyogenes (Group A Strep)

A colorized scanning electron microscope image of Group A Streptococcus (pink) during phagocytic interaction with a human neutrophil (green).

Image by NIAID

Strep throat

This image depicts an intraoral view of a patient, who had presented to a clinical setting exhibiting redness and edema of the oropharynx, and petechiae, or small red spots, on the soft palate. A diagnosis of strep throat had been made, caused by group A Streptococcus bacteria. These bacteria are spread through direct contact with mucus from the nose or throat, of persons who are infected, or through contact with infected wounds, or sores on the skin.

Image by CDC/ Heinz F. Eichenwald, MD

Strep throat

A culture positive case of strep throat with typical tonsillar exudate in an 8 year old.

Image by James Heilman, MD

This is an example of beta-hemolytic group B Streptococcus (GBS) growing in StrepB carrot broth.

This is an example of beta-hemolytic group B Streptococcus (GBS) growing in StrepB carrot broth. This media is a pigmented enrichment broth and the tube on the right shows a positive color change, indicating the presence of beta-hemolytic group B strep. Selective enrichment broths that incorporate chromogenic pigments for the detection of GBS using color detection can be used as an alternative to enrichment in Lim or TransVag broth. If no color is detected in the broth then the broth should be subcultured to an appropriate agar plate and further tested, or the broth can be tested directly to determine if GBS is present.

Image by CDC / American Society for Microbiology

Streptococcus pyogenes

This illustration depicts a photomicrograph of a specimen revealing numbers of chain linked Streptococcus pyogenes bacteria.

Image by CDC

Instructions for the collection of a genital swab for the detection of GBS from CDC

Instructions for the collection of a genital swab for the detection of GBS

Image by Centers for Disease Control

Streptococcus pyogenes

This 1977 image depicted two Petri dishes, each filled with trypticase soy agar medium, containing 5% defibrinated sheep's blood. The plate on the left had been stabbed and streaked with an inoculum containing Streptococcus mitis, alpha-hemolytic bacteria, a member of the Viridans group, while the right plate was stabbed with an inoculum containing Group A Streptococcus pyogenes (GAS), a typical beta-hemolytic bacteria. The inoculation was performed using a wire loop, which had been dipped into a primary culture medium. The BAPs were incubated in a carbon dioxide enriched atmosphere at 35oC for 24-hours. Additional Information:All culture organisms were Gram-positive cocci bacteria. The alpha-hemolytic organisms in the left plate grew colonies that were surrounded by a hazy, indistinct zone of partial red blood cell (RBC) hemolysis, and the beta-hemolytic bacteria on the right grew colonies surrounded by a clear, colorless zone of complete RBC destruction. Using the "stabbing" method of inoculation makes the qualitative interpretation of the hemolytic reaction much easier, for the results of colonial interactivity with the blood agar medium is much more pronounced, and therefore, easier to discern.

Image by CDC/ Richard R. Facklam, Ph.D.

Streptococcus agalactiae (Group B Streptococcus) colonies on Granada agar. Anaerobic incubation

Image by 43trevenque/Wikimedia

What Is Group B Strep (GBS)? | Pregnancy

Video by Howcast/YouTube

What should a pregnant woman know about group B strep?

Video by IntermountainMoms/YouTube

Two Signs of Strep

Video by Lee Health/YouTube

When strep triggers OCD and tics - Leah's story

Video by Moleculera Labs/YouTube

Strep Throat in Kids

Video by Children's Health/YouTube

How dangerous are strep infections?

Video by Moleculera Labs/YouTube

Mayo Clinic Minute: Is your child’s sore throat actually strep throat?

Video by Mayo Clinic/YouTube

Group A Strep Infections and Associated Rhinitis

Video by Larry Mellick/YouTube

Invasive Strep A cases on the rise

Video by CBC News/YouTube

Group B Strep in Pregnancy

Video by CNN/YouTube

Strep Throat

Video by Best Docs Network/YouTube

Group B Strep in pregnancy

Video by Bernadette Bos/YouTube

Group B Strep Infection in Adults

Video by Otolaryngologist,ORL,ENT-Medical Office,Artz Praxis/YouTube

Strep throat (streptococcal pharyngitis)- pathophysciology, signs and symptoms, diagnosis, treatment

Video by Armando Hasudungan/YouTube

Strep Throat and Scarlet Fever

Video by Larry Mellick/YouTube

Strep Throat Causes Loss of Limbs?

Video by The Doctors/YouTube

Strep Throat - Akron Children's Hospital video

Video by AkronChildrens/YouTube

Strep Throat – The Basics

Video by WebMD/YouTube

Strep Throat Turning into Scarlet Fever

Video by WAAY-TV 31 News/YouTube

Group B Strep in Pregnancy - CRASH! Medical Review Series

Video by Paul Bolin, M.D./YouTube

1:09

Real Questions | Pregnancy and Strep | UCLA OB/GYN

UCLA Health/YouTube

4:35

Study Reveals New Mechanism Fueling Group B Strep Infection

Seattle Children's/YouTube

2:29

What is a Group B Strep Test?

University of California Television (UCTV)/YouTube

1:26

Chronic Health Conditions: Prescription Medicines and Pregnancy

March of Dimes/YouTube

Streptococcus pyogenes

CDC/ Richard R. Facklam, Ph.D.

Strep Throat - Causes and Spread

James Heilman, MD

Streptococcus Pyogenes (Group A Strep)

NIAID

Strep throat

CDC/ Heinz F. Eichenwald, MD

Strep throat

James Heilman, MD

This is an example of beta-hemolytic group B Streptococcus (GBS) growing in StrepB carrot broth.

CDC / American Society for Microbiology

Streptococcus pyogenes

CDC

Instructions for the collection of a genital swab for the detection of GBS from CDC

Centers for Disease Control

Streptococcus pyogenes

CDC/ Richard R. Facklam, Ph.D.

Streptococcus agalactiae (Group B Streptococcus) colonies on Granada agar. Anaerobic incubation

43trevenque/Wikimedia

1:44

What Is Group B Strep (GBS)? | Pregnancy

Howcast/YouTube

1:39

What should a pregnant woman know about group B strep?

IntermountainMoms/YouTube

1:52

Two Signs of Strep

Lee Health/YouTube

4:04

When strep triggers OCD and tics - Leah's story

Moleculera Labs/YouTube

2:08

Strep Throat in Kids

Children's Health/YouTube

1:54

How dangerous are strep infections?

Moleculera Labs/YouTube

1:01

Mayo Clinic Minute: Is your child’s sore throat actually strep throat?

Mayo Clinic/YouTube

2:53

Group A Strep Infections and Associated Rhinitis

Larry Mellick/YouTube

6:19

Invasive Strep A cases on the rise

CBC News/YouTube

2:09

Group B Strep in Pregnancy

CNN/YouTube

1:14

Strep Throat

Best Docs Network/YouTube

6:07

Group B Strep in pregnancy

Bernadette Bos/YouTube

4:10

Group B Strep Infection in Adults

Otolaryngologist,ORL,ENT-Medical Office,Artz Praxis/YouTube

7:39

Strep throat (streptococcal pharyngitis)- pathophysciology, signs and symptoms, diagnosis, treatment

Armando Hasudungan/YouTube

2:12

Strep Throat and Scarlet Fever

Larry Mellick/YouTube

5:08

Strep Throat Causes Loss of Limbs?

The Doctors/YouTube

2:42

Strep Throat - Akron Children's Hospital video

AkronChildrens/YouTube

0:44

Strep Throat – The Basics

WebMD/YouTube

1:22

Strep Throat Turning into Scarlet Fever

WAAY-TV 31 News/YouTube

16:21

Group B Strep in Pregnancy - CRASH! Medical Review Series

Paul Bolin, M.D./YouTube

Contraction Stress Test

Contraction Stress Test

Also called: CST, Contraction Stress Test

A contraction stress test (CST) is used to monitor your baby’s heart rate after you have been induced to have mild contractions. This test is done during the last trimester of pregnancy to assess how well your baby will withstand actual labor.

Contraction Stress Test

Also called: CST, Contraction Stress Test

A contraction stress test (CST) is used to monitor your baby’s heart rate after you have been induced to have mild contractions. This test is done during the last trimester of pregnancy to assess how well your baby will withstand actual labor.

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Use the slider below to see how your results affect your health.
Your result is Negative.
A negative CST is normal. It means that your baby’s heart rate responds well (do not decelerate or stays slower) after the contraction. This result indicates adequate fetal oxygenation and normal placental function.
Related conditions
Your doctor may want to order this test when results from a nonstress test (NST) or biophysical profile are abnormal. This is done to:
- Find out if your baby’s heart rate will stay within a safe range during labor, when contractions reduce the oxygen levels to the placenta.
- Check to see if your placenta is healthy enough to withstand labor.
A contraction stress test is done when you are 34 or more weeks pregnant.
This test should not be done in the following situations:
- Preterm rupture of membranes (you have already broken your water)
- You have bleeding, especially if due to a condition known as placenta previa
- You’ve had a previous cesarean section with a midline (vertical) incision
- Known hypersensitivity to oxytocin
- Multiple pregnancy (you are pregnant with more than one baby)
- You’ve had a previous uterine surgery, because strong contractions may cause a uterine rupture
- You are obese or have marked uterine overdistention
Negative
A negative result is normal. It means that your baby’s heart rate responds well (do not decelerate or stays slower) after the contraction.
This result is associated with well-being of the fetus for up to 1 week after the test.
Equivocal
- Suspicious: in this case, there is at least one late deceleration (the baby’s heart rate stays slower after the contraction), but it is not repetitive enough to meet criteria for a positive test.
- Hyperstimulation: this means that one or more late deceleration is present with or following excessive uterine activity.
- Unsatisfactory: an adequate number and length of contractions cannot be achieved, or the quality of tracing is too poor for accurate interpretation.
Positive
A positive result is abnormal. It means that on more than half of the contractions your baby's heart rate gets slower (decelerates) and stays that way after the contraction (late decelerations).
This indicates that your baby might have problems during normal labor. Therefore, your doctor may want to admit you to the hospital for an early delivery.
1. Monitoring your baby before labor: MedlinePlus Medical Encyclopedia [accessed on Jan 10, 2019]
2. Contraction Stress Test | Michigan Medicine [accessed on Jan 10, 2019]
3. Contraction stress test | BabyCenter [accessed on Jan 10, 2019]
4. What is a contraction stress test? | Parents [accessed on Jan 10, 2019]
5. Nonstress and Contraction Stress Testing | GLOWM [accessed on Jan 10, 2019]
6. Prenatal Test: Contraction Stress Test (for Parents) [accessed on Jan 17, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Fetal Fibronectin Test

Fetal Fibronectin Test

Also called: fFN

Fetal fibronectin (fFN) is a test used to assess a pregnant woman's risk of preterm delivery. It is usually done between weeks 22 and 35 of pregnancy in women who are having symptoms of premature labor.

Fetal Fibronectin Test

Also called: fFN

Fetal fibronectin (fFN) is a test used to assess a pregnant woman's risk of preterm delivery. It is usually done between weeks 22 and 35 of pregnancy in women who are having symptoms of premature labor.

{"label":"Fetal Fibronectin Reference Range","scale":"lin","step":0.25,"hideunits":true,"items":[{"flag":"negative","label":{"short":"Negative","long":"Negative","orientation":"horizontal"},"values":{"min":0,"max":1},"text":"A negative test result means that there is no presence of fetal fibronectin in the vaginal fluid, indicating that the pregnant woman hasn\u2019t started labor yet. It is also highly predictive that the delivery won\u2019t happen within the next two weeks. ","conditions":[]},{"flag":"positive","label":{"short":"Positive","long":"Positive","orientation":"horizontal"},"values":{"min":1,"max":2},"text":"A positive test result means that fetal fibronectin protein is present in the vaginal fluid, suggesting a pregnancy going into preterm labor (if tested before the 34th week). ","conditions":["Preterm Labor","Preterm Birth"]}],"value":0.5}[{"negative":0},{"positive":0}]
Use the slider below to see how your results affect your health.
Your result is Negative.
A negative test result means that there is no presence of fetal fibronectin in the vaginal fluid, indicating that the pregnant woman hasn’t started labor yet. It is also highly predictive that the delivery won’t happen within the next two weeks.
Related conditions
If you are between 22 and 35 weeks of pregnancy and you are experiencing symptoms of preterm labor, this test will help to determine the likeliness of going into premature labor.
Your doctor may recommend this test if you have:
- Uterine contractions
- Changes in your vaginal discharge
- Abdominal pain and discomfort
- Cramping
- Dilation of the cervix
- Pelvic pressure
- Backache
1. Fetal Fibronectin (fFN) Test [accessed on Oct 02, 2018]
2. fFN [accessed on Dec 06, 2018]
3. Fetal Fibronectin - Health Encyclopedia - University of Rochester Medical Center [accessed on Dec 06, 2018]
4. Fetal fibronectin testing for reducing the risk of preterm birth | Cochrane [accessed on Dec 06, 2018]
5. Fetal Fibronectin (38226) [accessed on Dec 06, 2018]
6. Fetal fibronectin test - Mayo Clinic [accessed on Dec 06, 2018]
7. http://www.nichd.nih.gov/health/topics/preterm/conditioninfo/diagnosed [accessed on Nov 10, 2019]

Normal reference ranges can vary depending on the laboratory and the method used for testing. You must use the range supplied by the laboratory that performed your test to evaluate whether your results are "within normal limits."

Week 29

Human Fetus Upper and Lower Limb

Image by TheVisualMD

Week 35 of Pregnancy

Fingernails reach the tips of the fingers in an 8-month-old fetus.

Baby’s main job at this point is putting on weight (lucky him). During these last weeks of your pregnancy he’ll be packing it on to the tune of about half a pound per week.

Babies actually have not one, but two types of fat. One type, called brown fat, makes up about 5% of a newborn’s body mass. Brown fat has more mitochondria (the cell’s “power plants”) than does white fat. It helps to generate body heat to keep babies warm after they’re born, preventing hypothermia. Brown fat is deposited on baby’s back, near the shoulders, and along the upper half of his spine.

The other kind of fat, white fat, is the kind we’re more familiar with. It’s white fat that will give him his chubby little cheeks and plump arms and legs. By the time we become adults we’ve lost most of our brown fat.

Vernix, that thick, cheesy-looking coating protecting your baby’s delicate skin, is getting thicker now.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (1)

Human Fetus Right Hand 35 Weeks Gestational age, 32 Weeks Fetal age

TheVisualMD

Week 30

Week 29 Fetus Pregnancy Numerous blood Vessels Supply the fetus's energy hungry brain.

Image by TheVisualMD

Week 29 of Pregnancy

Numerous blood vessels supply the fetus’s energy-hungry brain.

Your little acrobat can do somersaults now, flipping head over heel! His eyes can produce tears. He’s taking deeper and longer “breaths”—going through the motions of breathing without actually taking in air. This is preparation for that all-important first real breath outside of you.

Your baby’s bones are fully developed but still soft and pliable. They will ossify, or harden, throughout his childhood and young adulthood. The fetal skull isn’t yet fully solid but contains five unconnected bony plates called fontanels (“little fountains”). This is a safety precaution for reducing the skull’s diameter in its passage through the birth canal. The unfused plates allow baby’s head to elongate during childbirth, then return to a rounded shape afterward. Your baby may retain the “soft spot” on his head for up to 2 years after birth.

Your baby has been storing fat subcutaneously (under the skin) and now has a much less wrinkled appearance than he did just a few weeks ago. In fact, during the last 11 weeks of pregnancy babies typically double in weight! The fat provides a source of stored energy and also helps maintain body temperature after birth. Before the baby is born, the placenta and the amniotic fluid perform this task. Fetal tissue temperature is about 8.5° F (0.25° C) higher than maternal tissue temperature.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (3)

Human Fetus Upper and Lower Limb of a seven month old fetus

TheVisualMD

0:14

Fetus in Amniotic Sac

TheVisualMD

Fetus Skull

TheVisualMD

Week 31

Pregnancy - Week 30

Image by TheVisualMD

Week 30 of Pregnancy

Fetal weight gain is rapid this trimester.

Your baby can now discriminate between high- and low-pitched sounds, so she’ll appreciate your lovely singing voice even more. Her vision is becoming more fine-tuned as well, and she’s doing a lot of blinking due to her newfound ability to respond to light and dark. Baby’s bone marrow is now producing red blood cells in abundance.

Although they aren’t yet performing the function of obtaining fresh oxygen for your baby’s body, her lungs are nevertheless metabolically active. The alveoli, or air sacs, have now filled with a fluid that is different from amniotic fluid. This special fetal lung fluid will help your baby to empty her lungs at birth in preparation for that first breath.

Measuring more than 10.5" (27 cm) long from crown to rump and weighing nearly 3 lbs (1,300 g), your little one is really starting to put on weight — a very good thing!

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (3)

0:20

Ear of a Fetus

TheVisualMD

Fetus during Week 30

TheVisualMD

Pregnant Woman Revealing Thorax and Abdomen

TheVisualMD

Week 32

Sensitive content

This media may include sensitive content

Lymphatic System of Mother and Human Fetus

Image by TheVisualMD

Week 31 of Pregnancy

The lymphatic system, part of the immune system, is present in both baby and mother. The immune system protects you and your baby from disease.

Your baby’s immune system is changing now. In the first and second trimesters, the fetal immune system is highly tolerant of foreign cells, probably so the fetus won’t reject the mother’s cells during pregnancy. But now your baby’s immune system is becoming more like an adult’s— programmed to attack anything it considers foreign, allowing it to fight off infection.

Baby is making breathing movements about 30% of the time, getting those little lungs ready for life outside of you. His bones, too, are growing quickly, so be sure you’re getting enough calcium! Brain growth is rapid as well. From this week until your baby is born, about 9 weeks from now, his brain weight will double.

At 29 weeks since conception, more preparations are being made for future generations as fetal sexual characteristics develop. If your baby is
a boy, his testes are now descending through the groin, headed for the scrotum. If your baby is a girl, her clitoris is now quite visible.

Important in these changes are the adrenal glands, which have doubled in size since week 20. They’re now producing large amounts of steroids, important hormones that stimulate the development and growth of sex organs, among other things.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (2)

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Hand of 8 Month Old Fetus

TheVisualMD

Fetus Cradled by Mother's Pelvic Bones (Week 31)

TheVisualMD

Week 33

Pregnant Woman with Fetus Practicing Meditation

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Week 32 of Pregnancy

Toenails have been growing in since the first trimester, but they’re now getting close to the ends of the toes.

Final arrangements for birth are underway throughout your baby’s body. Red blood cells are now being produced entirely in the marrow of her calcium-reinforced bones. Lanugo, the fine hairs that have covered her body, is starting to disappear. Her head hair is beginning
to appear.

Baby is growing by leaps and bounds and may measure about 11" (28 cm) long from crown to rump and weigh around 3 lbs, 12 oz (1,700 g). With so much growth, space is becoming limited in the uterus, and your baby is pulling her little legs more and more into what is known as the fetal position. Her toenails are now formed.

Meditation can be very helpful as you prepare to give birth and can aid you in staying calm and focused during labor. By taking some time to do a breath meditation every day, you can attain a peaceful, relaxed state of mind. You’ll decrease levels of cortisol, the stress hormone, and increase production of endorphins, the “feel-good” neurotransmitters. Both you and your baby will benefit.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (1)

Left Foot Human Fetus, 32 Weeks Gestational age, 30 Week Fetal age

TheVisualMD

Week 35

Human Fetus Face and Arm (Week 34 Gestational Age, Week 32 Fetal Age)

Image by TheVisualMD

Week 34 of Pregnancy

Your baby listens to your voice and will respond to it more than any other after birth.

You might not be feeling quite so much movement from your baby now. That’s because this week she may well have grown to an impressive 12" (30 cm) length, crown to rump, and weigh about 4 lbs, 8 oz (2,100 g). There’s not much room in the womb!

You’re probably feeling a little cramped yourself. Your uterus has expanded so much that it will soon, in the next 2 weeks or so, reach the lower edge of your rib cage. The enlarged uterus compresses your bladder and intestines, making it necessary to urinate frequently and possibly causing constipation. Your heart and kidneys are working harder to pump your increased blood supply. As your spine curves more to balance the weight of the uterus, you may find you’re getting backaches.

Fetal fingernails typically reach the ends of the fingers by week 34, so your baby can now scratch herself.

Your baby may have settled into her head-down, ready-to-move out position. If she were born this week, her chances of unimpaired survival would be excellent.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

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Day of Conception

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Week 36

Human Male and Female with Pregnancy

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Week 36 of Pregnancy

Your baby may land a good kick when things get a little too loud!

Did you know that what you’re eating now will influence your baby’s tastes? Studies have shown that fetuses whose mothers consumed aniseed (a spice used to flavor licorice) showed a liking for anise-flavored food after they were born. Fetuses whose mothers didn’t consume aniseed disliked the taste of anise after birth.

So, who knows, it might just be worth your while to eat lots of Brussels sprouts and broccoli this month!

Baby’s facial features are completely formed and distinctive, and they are filling out more as she grows. Her cheeks are getting plumper thanks to both accumulating fat and the development of powerful cheek muscles that will help your hungry baby to feed after birth. Lanugo, the fine downy hair that has covered her body, continues to disappear.

Coming into the last month of pregnancy, your little newborn-to-be is still putting on weight at the rate of about half a pound (227 grams) a week.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (4)

Week 36 - Your baby may land a good kick when things get a little too loud?

TheVisualMD

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Fetus in Fetal Position

TheVisualMD

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Foot of Fetus Revealing Toe Print

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Third Trimester Fetus

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Week 37

Pregnant Woman's Torso with Visible Skeletal Muscle

Image by TheVisualMD

Week 37 of Pregnancy

A healthy baby can weigh as little as 5 lbs, 8 oz, or more than 11 lbs.

Whatever position your baby has assumed is probably the one he’ll be in when you give birth. Very likely he’s in the head-down position now, ready for the big exit.

Good news: if your baby weighs over 5 lbs, 8 oz (2,495 g), and if you finish this week of pregnancy, he will be considered full term. At full term, the soon-to-be newborn has enough fat stores to keep warm and won’t require an incubator. His organs are ready to function on their own outside of the uterine environment. Lanugo has mostly disappeared from the skin.

Baby has been listening and learning, even before birth! After he’s born he’ll know your voice and prefer it to any other. He’ll also prefer songs and lullabies he’s heard before birth to new ones. Amazingly, newborns can even distinguish prose passages heard during the last 6 weeks of pregnancy from new passages.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (4)

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Full Term Baby

TheVisualMD

Upper and Lower Limb of Full Term Human Fetus

TheVisualMD

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9 Month Old Fetus in Utero

TheVisualMD

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Full Term Fetus

TheVisualMD

Week 38

Pregnancy

Image by TheVisualMD

Week 38 of Pregnancy

Only 5% of babies are actually born on their due date.

One of the greatest wonders of birth is the almost instantaneous transition the baby makes to breathing air. And that’s after 9 months of living in the womb, breathing no air whatsoever! Although pulmonary vessels are in place and the heart is pumping, blood circulating through the fetus bypasses the lungs altogether. Then, when baby takes her first breath, blood pressure in the lungs starts to drop lower than systemic blood pressure, and blood begins to flow into the lungs.

At the same time, the shunts (openings) in the heart through which fetal blood flows start to close, changing the pattern of blood circulation to that of an adult. The respiratory control center in the brain stem signals the diaphragm muscle to contract, the rib cage expands, and the lungs fill like sails in a gale.

All these simultaneous changes are coordinated as deftly and precisely as a symphony orchestra. Babies are marvels!

When it’s late in your pregnancy and you’re counting the days until your due date, it’s a good idea to remember that a due date is really only an approximation. Only 5% of babies are actually born on their due date; about 95% are born in the 2 weeks before or the 2 weeks after the due date.

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (1)

Heart and Lungs of Fetus at 36 Weeks (Week 38 Gestational Age, Week 36 Fetal Age)

TheVisualMD

Week 40

Week 40 - the baby begins to pass the birth canal

Image by TheVisualMD

Week 40 of Pregnancy

You probably have some idea by now of what the incredible experience of giving birth will be like for you, but imagine, too, what your baby will be going through.

Up until now, your unborn child has lived in a warm, dark, fluid world where every need has been filled instantly. Suddenly, your baby’s liquid environment disappears as the amniotic sac ruptures and the fluid gushes out of your vagina. Uterine contractions, stimulated by the brain hormone oxytocin, become stronger and more frequent with every passing minute, squeezing and constricting the baby's body. Another hormone is released by your ovaries to relax the cervix. It will widen from .5 cm to 10 cm to accommodate your baby’s head, which must distend and elongate to pass through it.

After hours of labor your little one is propelled into a strange, bright, noisy world. Organs like the stomach, intestines, and kidneys, not fully tested until now, must start functioning without delay. Blood entering the fetal heart has to be shunted to the lungs at once, and the openings in the heart it used to pass through must be sealed immediately. The infant nervous system instantly begins making use of information from eyes practically blinded by a blizzard of incoming data. Cold air rushes into tiny lungs for the first time, baby cries out—and a new life begins.”

Source: "Conception to Birth: The Visual Guide to Your Pregnancy" by Alexander Tsiaras

Additional Materials (10)

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Baby's Head Moving Down the Pelvic Canal

Video of a lateral view of a mother's pregnant abdomen as she lies in a hospital bed. The video fades to black and the 3-D modeled baby and mother's pelvis fades in. Animation is of the baby's head going through the pelvis.

Video by TheVisualMD

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Childbirth Process

Video of a woman giving birth. The camera angle is a bird's eye view. A 3-D modeled baby can be seen through the mother's abdomen. Out of view is the doctor helping deliver the baby. Once the head is out of the birth canal, the doctor assist in pulling the baby out.

Video by TheVisualMD

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Childbirth Process

Close-up video of a mother's pregnant stomach during delivery. Through the mother's abdomen, a 3D modeled baby can be seen. The baby is in the final stage of delivery with the head already through the birth canal.

Video by TheVisualMD

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Childbirth - Cervix Dilation Sequence

Childbirth - Stages of labor - First stage Cervix dilation sequence : Cervical effacement and dilation sequence in labor.

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Baby Passing Through Birth Canal During Childbirth Process

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Childbirth - Multiple views

Fetus Passing Through Birth Canal During Childbirth Process - Computer generated image reconstructed from scanned human data. Actual size of fetus at time of birth (crown to rump) = 360 mm. This image presents an overhead view of the process of birth. Typically, the expected time of birth is approximately 266 days or 38 weeks after fertilization. The maternal skeletal system is revealed through the translucent skin revealing the scull, ribcage and pelvis. The fetus, which has partially passed through the vaginal canal is still connected to the mother via the umbilical cord.

Interactive by TheVisualMD

Male Pelvis / Female Pelvis

Male Female Pelvis Comparison

Interactive by TheVisualMD

Birth

Your Baby Enters the World : Like every other step in the 9-month process, the initiation of labor involves a complex interplay of maternal and fetal factors mediated through chemical signals. The growing fetus has been sustained by the maternal heart, lung, immune, and nutrition support systems. And then, suddenly and dramatically, all of the infant`s developing systems must perform on their own at birth. The newborn is now thrust into physiological independence.

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Birth

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Childbirth - Final Push

Childbirth - Final Push

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Birth - Step by Step

Birth - Step by Step

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Baby's Head Moving Down the Pelvic Canal

TheVisualMD

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Childbirth Process

TheVisualMD

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Childbirth Process

TheVisualMD

Childbirth - Cervix Dilation Sequence

Fred the Oyster/Wikimedia

Childbirth - Multiple views

TheVisualMD

Male Female Pelvis Comparison

TheVisualMD

Birth

TheVisualMD

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Birth

TheVisualMD

Childbirth - Final Push

TheVisualMD

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Birth - Step by Step

TheVisualMD

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