Nuchal translucency
Nuchal translucency (NT) is a fluid filled space normally seen behind the fetal neck on prenatal ultrasound that is performed in the first trimester. It may be enlarged in Down syndrome and other genetic disorders. Precise NT measurement is a key component of the standard fetal aneuploidy screening test (in conjunction with maternal serum biochemical markers) conducted between 11 and 14 weeks of gestation.
