What is an abnormal NT scan measurement? An abnormal measurement is when the skin fold measure is larger than the normal range of up to 2 mm at 11 weeks or 2.8 mm at 13 weeks 6 days.

An increased fetal nuchal translucency detected by first trimester ultrasound has been associated with an elevated risk of aneuploidy. The etiology of the increased nuchal translucency in fetuses ...