4 doctors weighed in:
Safety of chorionic sampling vs. Amniocentesis for prenatal diagnosis of chromosomal abnormalities?
4 doctors weighed in

Dr. Marilynn Frederiksen
Obstetrics & Gynecology - Maternal Fetal Medicine
3 doctors agree
In brief: Risks
The risk of pregnancy loss has been looked at in four randomized studies of cvs vs.
Amniocentesis. All four studies show that both procedures have about the same risk of pregnancy loss. About 1 in 1600. Another cvs study showed that losses in a group of women who had the procedure were equal to losses in a group of women who didn't have the procedure. A loss may not be related to the procedure.

In brief: Risks
The risk of pregnancy loss has been looked at in four randomized studies of cvs vs.
Amniocentesis. All four studies show that both procedures have about the same risk of pregnancy loss. About 1 in 1600. Another cvs study showed that losses in a group of women who had the procedure were equal to losses in a group of women who didn't have the procedure. A loss may not be related to the procedure.
Dr. Marilynn Frederiksen
Dr. Marilynn Frederiksen
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