A study comparing transcervical with transabdominal chorionic villus sampling (CVS).

Chorionic villus sampling (CVS) was performed in 50 anaesthetized patients before therapeutic abortion by the transabdominal route and then by the transcervical route. The two methods of villus sampling were equally successful in obtaining villi but the transcervical method was significantly better at obtaining chorionic villi greater than 10 mg in weight (chi 2 13.92 P less than 0.001). Placental position did not affect villus recovery with either sampling method.