Which prenatal test, usually performed between 8 and 11 weeks, produces a risk of miscarriage of 1 in 100 to 1 in 200 pregnancies?

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Chorionic villus sampling (CVS) is a prenatal test conducted between 8 and 11 weeks of pregnancy that involves taking a sample of tissue from the placenta to test for chromosomal abnormalities and certain other genetic problems. The procedure carries a risk of miscarriage, which is estimated to be about 1 in 100 to 1 in 200 pregnancies.

Which Prenatal Test, Usually Performed Between 8 and 11 Weeks