Where I am the 12 wk scan is the dating scan and first scan you get. Measuring the neck fold is an added extra that you can get but isn't normally done at this scan. We got the 12 wk dating scan but not the NT part. 1) We'd have to pay to have it done. 2) We'd have to go to a different scan place, not just our midwife. 3) We're low risk 4) We didn't think we'd do anything differently if a problem was discovered.
Also just after we'd made our decision a friend of mine got the NT test and got a really high chance 1/2 of abnormality and was told it wasn't likely that her baby would survive. Of course she was completely freaked out and got more and more tests done. It's looking more and more like it was a false positive and her baby is absolutely fine but she's still really anxious and probably will be at least until the baby is born.
