Chorionic villus sampling (CVS) is a prenatal test that detects chromosomal abnormalities such as Down syndrome, as well as a host of other genetic disorders. The doctor takes cells from tiny fingerlike projections on the placenta called the chorionic villi and sends them to a lab for genetic analysis.
The main advantage of CVS over amniocentesis is that you can have it done earlier — generally between 10 and 12 weeks of pregnancy, although some testing centers will do it as late as 13 weeks, 6 days. (For an amnio, you’ll have to wait until you’re at least 16 weeks pregnant.)
Women who choose to have CVS or amniocentesis are primarily those at increased risk for genetic and chromosomal problems, in part because these tests are invasive and carry a small risk of miscarriage.
As soon as a woman becomes pregnant, it's important to begin prenatal care and tests, especially during the first trimester of pregnancy.
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