Definition of chorionic villus sampling in US English:

chorionic villus sampling

(also CVS)


  • A test made in early pregnancy to detect congenital abnormalities in the fetus. A tiny tissue sample is taken from the villi of the chorion, which forms the fetal part of the placenta.

    • ‘Women at higher risk of carrying a baby with such conditions may opt for testing procedures like amniocentesis or chorionic villus sampling.’
    • ‘Another prenatal test, called chorionic villus sampling, can diagnose most, but not all, of the same birth defects as amniocentesis.’
    • ‘These options include amniocentesis, early amniocentesis, chorionic villus sampling, and ultrasound examination.’
    • ‘Prenatal tests called amniocentesis and chorionic villus sampling can diagnose Tay-Sachs before birth.’
    • ‘Some birth defects can be diagnosed before birth, using one or more prenatal tests including ultrasound, amniocentesis and chorionic villus sampling.’