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A nuchal translucency ultrasound (commonly called a ânuchal scanâ or âNT scanâ) is an ultrasound performed between 11.5 and 13 weeks 6 days gestation. It is usually part of an assessment called combined first trimester screening.he best time to have the blood test is 10 weeks gestation, however it can be performed at any time between 10 and 13 weeks 6 days gestation. It is ideal (but not essential) to have the blood test results available at your nuchal translucency ultrasound.
The NT measurement varies with the gestational age of the pregnancy. An increased NT measurement is associated with an increased risk for chromosome abnormalities, such as Turner syndrome, as well as congenital heart defects. Turner syndrome is also associated with congenital heart defects. A fetal echocardiogram is a specialized ultrasound of the fetal heart performed after 18 weeks gestation to look for heart defects when indicated. A comprehensive ultrasound can also be performed to look for structural birth defects.