I had the test when I was pregnant. I don't even know why they performed it, since I was <30 and had no family history of Down. Anyway, my son was swimming around and they had trouble measuring, but finally got around 2 mm and told me it was concerning. They did bloodwork, which came out normal. Then on another ultrasound they found another marker for Down - echogenic bowl. The doctor tried to convince me to go for amnio, but I had long before decided to give birth to whoever was in there and didn't see the point of the test. I also read up on it a lot and saw that 2 mm wasn't that extreme (still have the references if you need them), but spend a good chunk of the pregnancy worrying. Anyway, my son was born without Down, but he recently had a psych evaluation and was found to have "behavioral problems". I think he is very likely Aspie and just acted out during the evaluation because he didn't understand the evaluator's irrational and authoritative behavior. He's bio dad is Aspie, and the more I think and read about it, I don't I'm quite NT. The thing is that I never realized it until I had my son.