usually more detailed defects cannot be seen at the NT/first trimester screening scan as it's too early!
the fetal anatomy scan at 20-22 weeks would be more suitable for those.
the NT scan though is good for seeing rough structures that can help give a little bit more indication of genetic syndrome risks e.g. nuchal translucency thickness (behind neck thickness), nasal bone/cranium (skull) presence, rough heart structure/activity, and the limbs.
I was seeing a private obgyn prior to moving to NUH private and she didn't mention to do NT scan with NIPT...the NT scan would've only been part of OSCAR if I opted for that. my current obgyn at NUH recommended this to check the above-mentioned structural features on top of the NIPT and it was great to see baby at 12 weeks formed so well :")
if doing NIPT, we get a v good screen of the genetic risks with baby DNA tested..not really so necessary to add on the other maternal serum/hormone tests that are in OSCAR.
Jasmine