Chorionic Villus Sampling


This is a test to detect genetic abnormalities; sampling is done early in pregnancy usually between 9-11 weeks. CVS is done for many reasons. The test helps to identify problems related to genetic defects such as Down syndrome. This test offers advantage over amniocentesis because it is done much earlier in pregnancy; results are available in about 1 week. If a pregnancy needs to be terminated, it can be done earlier and pose fewer risks to the woman. CVS involves placing an instrument through the cervix or abdomen to extract fetal tissue from the placenta. This procedure should only be performed by someone experienced in the technique. If your doctor recommends CVS, discuss the risks. The risk of miscarriage is small - between 1 and 2%.