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What is chorionic villus sampling (CVS)?

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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.

From: Pregnancy and Chorionic Villus Sampling WebMD Medical Reference

Reviewed by Trina Pagano on September 20, 2018

Medically Reviewed on 09/20/2018

SOURCE: March of Dimes web site.
 

Reviewed by Trina Pagano on September 20, 2018

SOURCE: March of Dimes web site.
 

Reviewed by Trina Pagano on September 20, 2018

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What diseases or disorders can chorionic villus sampling (CVS) help identify, and how accurate is the test?

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