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Information on CVS and amniocentesis


Chorionic Villus Sampling (CVS)

Chorionic Villus Sampling (CVS)

CVS is generally performed between 11 and 12 weeks of pregnancy. Under ultrasound guidance a slender needle is inserted through the woman’s abdomen into the placental tissue and a small sample of the tissue is obtained. (CVS is occasionally done through the vagina). The diagnostic test to see if the fetus is affected with fragile X syndrome is done on this sample.

The risk of miscarriage from the amniocentesis procedure is approximately 1 in 100 or 1%.



Amniocentesis

Amniocentesis

Amniocentesis is generally performed between 15 and 18 weeks of pregnancy. Under ultrasound guidance a slender needle is inserted through the woman’s abdomen and a small sample of amniotic fluid is obtained. The diagnostic test to see if the fetus is affected with fragile X syndrome is done on this sample.

The risk of miscarriage from the amniocentesis procedure is approximately 1 in 200 or 0.5%