CVS (Chorionic Villi Sampling)

CVS is a prenatal test that helps you learn if a fetus has health problems. The test is most often done between weeks 9 and 11 of pregnancy. Discuss with your doctor whether CVS is right for you.

Should You Have CVS?

If the fetus has a higher than normal chance of birth defects or other problems, you may want to have this test. The following risk factors can increase chances of fetal health problems:

• You’re 35 or older.

• There’s a history of inherited (genetic) problems in your family.

• Other tests have shown that the fetus may have health problems.

How Is CVS Done?

• First, the fetus is located with ultrasound (sound waves that make an image on a screen).

• A thin tube is then inserted into your vagina and guided to your uterus. Or, you may have a thin hollow needle inserted through your belly.

• A small amount of cells from the tissue that will become the placenta (chorionic villi) are removed by gentle suction.

• You can go home right after the test. But you may need to take it easy for a day or so.

Getting Test Results

You’ll learn your CVS results in 3–5 days. Most results are normal. Even if yours aren’t, it doesn’t always mean there’s a problem. You and your doctor can talk about other tests or special care you may want.