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What Is Chorionic Villus Sampling (CVS)?

Medical specialists near ultrasound machine in the hospital ward

Chorionic villus sampling (CVS) is a prenatal diagnostic test that can be given as early as the 9th week of pregnancy to identify or rule out certain birth defects, including genetic conditions and chromosomal abnormalities. CVS is a relatively standard procedure that can be done as early as the 9th week of pregnancy but is typically done between 10-12 weeks of pregnancy.