A member asked:

At what stage is chorionic villus sampling done?

6 doctors weighed in across 2 answers

10-12 weeks: Chorionic villus sampling (cvs) obtains cells from the fetoplacenta for testing at 10-12 weeks of pregnancy, amniocentesis obtains fetal skin/urine cells at 16-18 weeks. Higher risks for miscarriage (2-3% for cvs, <0.5% or negligible for amnio) balance against the cvs advantage of testing before a women "shows, " preserving the privacy of pregnancy (testing).

Answered 9/2/2015


Dr. Stephen Pappachen answered

Specializes in Obstetrics and Gynecology

About 8 weeks: Keep in mind that this is the first trimester and risk of pregnancy loss in increased when compared to amniocentesis, which is usually done in the second trimester for diagnostic purposes.

Answered 3/22/2020



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