Unless you are willing to have an amnio or a CVS it is pointless having the NT scan as all you will get is a risk factor which tells you absolutely nothing. Not all DS cases are picked up as high risk by the NT scan or by later ultrasounds as there isn't always a noticeable marker.

I had the NT scan & came in as high risk for DS 1/37 low risk for the other one they measure. My bub had a large NT measurement & of course my age didn't help the result.

I had the amnio done by a very skilled doctor & all went well. The result said no abnormality detected. My bub was born without DS.

Had I not had the amnio done I would've spent the rest of the pregnancy worried that I was having a DS baby.