Is chorionic villus sampling (CVS) safe?
Your doctor’s primary concern will be misscarriage. The risk of misscarriage is about 0.5% — 1.5% (1 in 66 — 200). This compares to amniocentesis where the risk is about 0.25% (1 in 400). Your doctor will not perform chorionic villus sampling before week 9 1/2 because of the increased risk of limb defects in the baby.