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Unformatted text preview: cultured on a laboratory culture dish for 2 weeks to obtain sufficient numbers of cells. The risk of inducing a spontaneous abortion by this procedure is 0.5 to 1% above the background rate of spontaneous abortion. Chorionic Villi Sampling Chorionic villi sampling is a procedure in which a small amount of the placenta is removed. It is normally done during the 10th to 12th week but it can be done as early as the 5th week of pregnancy. Karyotype analysis can be performed on these cells immediately after sampling. Although Chorionic villi sampling can be performed earlier in the pregnancy than amniocentesis, the risk of inducing a spontaneous abortion is 1 to 2% higher than the background rate....
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- Fall '10