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Ohm Society
Chorion and Chorionic Villus Sampling Print E-mail

Dr. Kennedy The chorion is the outermost of the two fetal membranes (the amnion is the innermost) which together surround the embryo. The chorion develops villi (vascular fingers) and gives rise to the placenta. A procedure for first-trimester prenatal diagnosis is chorionic villus sampling and may be done between the eighth and tenth weeks of pregnancy. The intent is to diagnose severe abnormalities afflicting the fetus. In the procedure, tissue is withdrawn from the villi of the chorion, a part of the placenta, and examined. Chorionic villus sampling is referred to as CVS.

The information in this article is not meant to be medical advice.�Treatment for a medical condition should come at the recommendation of your personal physician.

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