My wife's Down syndrome test with Trisomy 21 and 18 were at high risk. My Doctor said that by 20th week scan we can confirm any anomality. Also she has asked us to go for another NIPT test to decide the chromosomal variation of the fetus. Another doctor who is a fried of mine says not to worry. It will be normal only. Can anyone let me know if you have such tests and still your child has no abnormalities or chances of these test results being false positive.