villus
- n a minute hairlike projection on mucous membrane
- If the test is positive, you still have to decide whether to undergo amniocentesis or another test, chorionic villus sampling, to confirm the diagnosis one way or the other.
- When performed in the first 60 days of pregnancy, the test, chorionic villus sampling, sometimes leads to the loss of an arm or leg.
- Then came two breakthrough fetal tests: amniocentesis, which can identify abnormalities in the 15th week of pregnancy; and chorionic villus sampling, which can be performed as .