Chorionic villus sampling (CVS).

Doctors take a small piece of your placenta by putting a needle through your belly or a small tube up your vagina. They test the sample for Down syndrome and other genetic conditions. Only some high-risk women will need this test, usually if a screening found a risk of a birth defect. The procedure will tell you for sure if there’s a problem, but it also comes with a risk of miscarriage that’s similar to amniocentesis. Talk to your doctor about whether you should have CVS.

 

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