An invaluable resource of health information. Chorionic villus
sampling Chorionic villus sampling (CVS) is the removal of a
small piece of placenta tissue (chorionic villi) from the uterus
during early pregnancy to screen the baby for genetic defects. -
How the test is performed CVS can be done through the cervix
(transcervical) or through the abdomen (transabdominal). The
techniques are equally safe when done by a provider with
experience, although miscarriage rates are slightly higher when
done through the cervix. The health care provider will use
ultrasound to pick the safest approach and as a guide during
sampling. An abdominal ultrasound is performed to determine the
position of the uterus, the size of the gestational sac, and the
position of the placenta within the uterus. Your vulva, vagina,
cervix, and abdomen are cleaned with an antiseptic such as
Betadine. The transcervical procedure is performed by inserting
a thin plastic tube through the vagina and cervix to reach the
placenta. The provider uses