The best time to do chorionic villous sampling is: (A) Between 6-8 weeks, (B) Between 7-9 weeks, (C) Between 9-11 weeks, (D) Between 11-13 weeks
Answer is D. Ans. is d i.e. Between 11 - 13 weeks Chorionic villi sampling "CVS is the second most common procedure for genetic prenatal diagnosis. Because this procedure is routinely performed at about 10 to 12 weeks of gestation, it allows for an earlier detection of abnormalities and a safer pregnancy termination, if desired."