Chorionic villus sampling (CVS) is a diagnostic test performed between the 10th and 12th week of pregnancy in which a tiny sample of cells is removed from the placenta, cultured in a laboratory, and the DNA is examined for genetic content. Because the placenta is made up of cells that derive from the same fertilized egg as the fetus, it's an ideal resource for DNA that can reveal any genetic abnormalities in your developing baby (or for a paternity test). The advantage of CVS over amniocentesis is that you can have the test done much earlier (amnio is usually performed between 16 and 20 weeks).
While CVS can detect up to 200 different genetic defects with 98-99 percent accuracy (including Tay Sachs, cystic fibrosis, and hemophilia), it cannot detect neural tube defects such as spina bifida, which can be picked up by amniocentesis.
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