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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.).
A CVS can be performed between weeks 10 and 13 of your pregnancy. Youâll need a doctorâs consent when itâs done to establish paternity. Like amniocentesis, itâs typically used to detect chromosome abnormalities and other genetic disorders. Unfortunately, 1 in every 100 CVS procedures will result in miscarriage.