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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.
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.
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.
Call your doctor right away if you notice:
Severe pain or cramping
Vaginal bleeding (spotting)
Fever or chills
Fluid leaking from your vagina
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.