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chorionic villus sampling |
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chorionic villus samplingBiopsy of a small sample of placental tissue, carried out in early pregnancy at 10–12 weeks' gestation. Since the placenta forms from embryonic cells, the tissue obtained can be tested to reveal genetic abnormality in the fetus. The advantage of CVS over amniocentesis is that it provides an earlier diagnosis, so that if any abnormality is discovered, and the parents opt for an abortion, it can be carried out more safely. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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ROAMING FREE Amniocentesis and chorionic villus sampling are currently the only way doctors have for analyzing a fetus' genes, but scientists have for decades been contemplating how to replace these tests with less invasive ones. Chorionic villus sampling, to detect genetic abnormalities in the embryo or fetus in the first trimester. Previously, the only way to know if a woman was having a baby with Down's was with second-trimester blood tests and/or invasive amniocentesis or chorionic villus sampling (CVS) tests, all of which carry a slight risk of miscarriage. |
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