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CVS is usually performed between 10 and 13 weeks from your last menstrual period. CVS may be chosen over amniocentesis because it may be performed earlier in the pregnancy. Chorionic villus sampling detects chromosome abnormalities (i.e. Down syndrome) and genetic disorders (i.e. cystic fibrosis.).
The sample is used to check your babyâs health. You can get CVS early in pregnancy, between 10 and 12 weeks. CVS isnât given to all pregnant women because thereâs a small chance of miscarriage after the test. CVS is different from another prenatal test called amniocentesis (also called amnio).