Alpha-Fetoprotein Test (or AFP Test)

The purpose of routine pre-natal exams is to monitor the health of both mom and baby. Typical prenatal exams consist of obtaining the mothers weight, vital signs (temperature, pulse, respirations and blood pressure) listening to the fetal heart beat and discussing any questions or concerns the doctor or woman may have.

When is the Alpha-Fetoprotein test performed?

During the period of 15 to 20 weeks gestation, about halfway through pregnancy, many pregnant women are offered and encouraged to undergo more invasive prenatal testing. One of the tests available is called the AFP or Alpha-Fetoprotein test. The AFP test is a blood test used to screen the baby for certain conditions. The blood taken is that from mom, but a sample can be obtained for testing from amniotic fluid. The AFP test is not a diagnosis. It can only be used to test for the increased likelihood of an abnormality or birth defect.

What is Alpha-Fetoprotein and why is the AFP test done?

Alpha-Fetoprotein is a substance produced by the fetus in utero. AFP stops being produced once the baby is born. The AFP is excreted in the fetal urine which crosses into the mother’s blood stream. This is why AFP can be detected by a blood sample taken from the pregnant mother.

High levels of AFP can indicate an increased chance of the fetus having a neural tube defect such as spina bifida. Another possibility with a high level of AFP can be a low level of amniotic fluid surrounding the fetus. An abnormally low AFP level can indicate an increased risk of Down syndrome.

The AFP is rarely performed alone. AFP is usually part of a test called a “triple screen.” The purpose of the triple screen test is to use the results of all three blood tests to increase the accuracy of the results.

There are practically no risks involved with having the test performed. A simple blood sample is obtained, generally from a vein in the arm. Bruising is normal and women who are taking blood thinners or have a clotting disorder may take longer to stop bleeding from the site.

The accuracy rate of the AFP test is estimated at 80%. Many times women who under go testing are given results that indicate a high risk for birth defects and the baby is born without an abnormality. This is referred to as a “false positive.”

What happens if you have an abnormal AFP test?

When a woman’s results return abnormal, an ultrasound is usually performed. The fetus will then be observed to find an explanation for the abnormal findings. If no answers can be found during an ultrasound exam, a doctor would probably next recommend an amniocentesis.

Many women opt to have the AFP and or triple screen performed so that if there might be a chance of a problem, they can be prepared. If a neural tube defect or other condition is diagnosed, it allows the mother the opportunity to discuss her options.

Many women also opt out of having blood testing performed during pregnancy especially the AFP due to the increased likelihood of a false positive and unnecessary anxiety.

Unless testing is a state requirement, all prenatal tests are a personal choice that you can consent to or refuse.

© Rebecca Pillar 2008

0
No votes yet
 

1 comment

By abeykelly on 01/20/16 at 10:56 pm

This is my testimony about the good work of a man who helped me....My name is Abey Kelly ... My life is back!!! After 8 years of marriage, my husband le  ...

Sign in to leave a comment!

Today on JustMommies

6 Fun & Easy Exercises to Do with Your Kids

With the alarming (and climbing) rate of childhood obesity in the United States, it's more important than ever that parents model healthy behaviors for their children.

5 Things Only Moms of Picky Eaters Will Understand

Your picky eater is all yours, so you love him, of course, but do you ever have those days where you think about how much easier life would be with a kid who just loved to try new foods?

Is Your Child a Natural-Born Liar?

Have you recently caught your little one lying for the first time? Or maybe it’s become a thing now, where your child seems to lying on the regular.

Quick Tips for Choosing the Best Summer Camp

Whether you’re looking for a camp where your child can enjoy outdoor adventure, or one where he or she can play rock ‘n roll music, pickin’ the right one should be stress-free.

From The Message Boards

Pregnancy Over 35

Im 37 and surprisingly pregnant, could use some people to talk to!

Hi all. Im 37 and just found out I was pregnant. I would imagine a few weeks. I have some health wor...

Pregnancy Over 35

I'm pregnant after Cancer...

Hey all, so I fit into a lot of categories on these boards. High Risk, after loss and What in the Wo...

Pregnancy Questions

Help!!! wireless radiation

Hello, A few of our friends warned us about harms of cell phone and wifi radiations on the baby. I...

Pregnancy Questions

Lead paint?? Anyone else live in an older house?

I live in a home built in the 1920's so it was safe to assume there would be some lead paint. But it...

Baby Names

Girl Names

Need some help with girl names to go with big sister Addison Lyn! Last name starts with C and is two...