What is chorionic villus sampling (CVS)?
Chorionic villus sampling (CVS) is a prenatal test to detect birth defects, genetic diseases, and other problems during pregnancy. During the test, a small sample of cells (called chorionic villi) is taken from the placenta. Chorionic villi are tiny parts of the placenta that are formed from the fertilized egg.
You may be offered CVS if you have certain things that make you more likely to give birth to a baby with a birth defect or genetic disease, so problems can be found early in pregnancy.
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