When comparing chorionic villus sampling (CVS) to amniocentesis, which statement is true?
a. CVS and amniocentesis are both used to diagnose the presence of a neural tube defect.
b. There is a higher incidence of pregnancy loss with CVS than amniocentesis.
c. In contrast to CVS, amniocentesis can be done anytime during pregnancy.
d. The waiting time for obtaining results from CVS and amniocentesis is the same.
B
CVS carries a much higher risk of spontaneous pregnancy loss than amniocentesis. CVS cannot determine the presence of neural tube defects.CVS was designed to be used during the first trimester; amniocentesis is done preferably during the second and third trimester after the uterus has risen up from inside the pelvis. CVS has a much shorter interval between test performance and availability of results when compared to amniocentesis.
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