A nuchal scan or nuchal translucency (NT) scan/procedure is a sonographic prenatal screening scan (ultrasound) to detect cardiovascular abnormalities in a fetus, though altered extracellular matrix composition and limited lymphatic drainage can also be detected. What is the normal range for NT scan at 12 weeks? First trimester measurement of NT at 12 weeks of gestation was 3.2 mm during the routine first trimester screening. The normal range of NT for this age is 1.1-3 mm. How is NT scan done? It would also be too early to combine it with your first trimester blood test. It's too late to do the NT scan after 14 weeks, as any excess nuchal fluid may be absorbed by your baby's developing lymphatic system. The scan is usually done through your tummy using normal ultrasound equipment. How accurate is NT scan? Accuracy of nuchal translucency scan. Screening tests aren't perfect. ... The NT scan alone will detect about 70 to 80 percent of babies with Down syndrome (depending on which study you look at). The detection rate for the NT scan plus a first-trimester blood test ranges from 79 to 90 percent. Is NT scan necessary during pregnancy? A nuchal translucency scan (also called first trimester of pregnancy screening) is carried out during weeks 11–13 of a pregnancy. ... Women who return a high-risk result from the screening will be offered formal genetic testing using other procedures, such as amniocentesis or chorion villus sampling (CVS). We are providing all Diagnostic Facilities in our center.... We have Ultramodern Songraphy Facility We have 2 D Echo Facility We have Doppler Facility We are doing All Pathology Tests We have Digital X-ray We have ECG facility Visit us @ "www.diagnosticcentrepune.in"