Chorionic villus sampling (CVS) is a prenatal test used to detect genetic abnormalities in a developing fetus. It involves taking a small sample of tissue from the chorionic villi, which are tiny finger-like projections in the placenta. This procedure is typically performed between the 10th and 13th weeks of pregnancy and can provide early information about conditions such as Down syndrome or other genetic disorders. The sample collected during CVS can be analyzed for chromosomal abnormalities and certain genetic conditions. While CVS is generally safe, it does carry some risks, including miscarriage. It is important for expectant parents to discuss the benefits and risks with their healthcare provider before proceeding.