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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.
A nuchal translucency scan can only indicate the level of risk of your baby having Down's syndrome. It can't tell you for sure whether your baby will have the abnormality or not. It is what is known as a screening test as opposed to a diagnostic test that gives you an exact diagnosis.n NT scan must take place at a particular time in your pregnancy. It is done between 11 weeks plus two days and 13 weeks 6 days when your baby's crown rump length (CRL) is between 45mm (1.8in) and 84mm (3.3in). Before 11 weeks the scan is technically difficult because your baby is so tiny.