CVS or chorionic villus sampling is a prenatal invasive procedure that can diagnose genetic conditions. This procedure is often done between 10 weeks and 13 weeks 6 days. The chorionic villi are the components of the placenta that come from the fetus. A doctor is able to obtain cells from this part of the placenta to be sent to a laboratory for genetic testing. Depending on where the placenta is, the cells can be obtained through the cervix or through the abdomen. During the procedure, women may experience cramping similar to menstrual cramps. After the procedure, this cramping may persist, but it typically gets better with time. Since this is an invasive procedure, it carries a small risk of miscarriage. Each doctor that performs this procedure will quote their own specific risk; however it is typically around 1 in 200 (0.5%).
There is a fun, educational, and downloadable video all about CVS available online from the Genetic Support foundation called Chorionic Villus Sampling (CVS) .
To find a genetic counselor near you who can discuss CVS and other genetic tests available before birth, visit the National Society of Genetic Counselors Find a Genetic Counselor website.
Other Questions About What is a CVS?
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