What is prenatal testing?

Prenatal testing provides information about the health of your fetus before the baby is born. Some routine tests during pregnancy also check your health. The prenatal test may use a sample of your blood, urine or fluid from your vagina, cervix, or rectum.

Since some health conditions can be treated before your baby is born, it's important to find them early. But even if they cannot be treated, it can still be helpful to know about the problem early on. This gives you time to learn about the condition and prepare for any challenges you may face after the baby is born.

What is prenatal testing used to diagnose?

At your first prenatal visit, your health care provider will test for various conditions, including problems with your blood, signs of infections, and whether you are immune to rubella (German measles) and chickenpox.

Throughout your pregnancy, your provider may recommend additional tests as well. Some tests are suggested for all women, such as screenings for gestational diabetes, Down syndrome, and HIV.

Your provider might offer other tests based on your:

• Age
• Personal or family medical history
• Ethnic background
• Results of routine tests

What are the two types of prenatal tests?

There are two types of tests:

• Screening tests check if you or your fetus may have certain health issues. They look at risk but do not diagnose problems. If your screening test result is abnormal, it does not mean that there is a problem. It means that more information is needed. Your provider can explain what the test results mean and possible next steps. You may need diagnostic testing.
• Diagnostic tests help determine whether you or your fetus have a certain health problem.

It is your choice whether to get prenatal tests. You and your provider can talk about the risks and benefits of the tests, as well as the type of information they can give you. Then you can decide which ones are right for you.

National Women's Health Information Center