NT Scan, Nuchal translucency (NT), Nasal Bone (NB).

A nuchal translucency screening is a specialized routine ultrasound performed between week 11 and week 13 of pregnancy. Fetuses with increased fluid at the base of their necks — a spot known as the nuchal fold — may have a chromosomal problem such as Down syndrome.

Nuchal translucency is a prenatal screening, which means the results can’t tell you for sure whether your child has a chromosomal disorder, only the statistical likelihood. It’s often combined with a blood test to offer more insight into the relative odds of your baby being born with a genetic disorder.