Description
Radiology
Sample Required:
No sample is required for an NT (Nuchal Translucency) scan. It is a non-invasive ultrasound examination.
Test Time:
The NT scan typically takes around 20 to 30 minutes to complete.
Test Normal Range:
The normal range for the Nuchal Translucency measurement is generally less than 3 millimeters (mm) for fetuses between 11 and 14 weeks of gestation. However, it’s important to note that the NT measurement alone does not provide a definitive diagnosis for chromosomal abnormalities.
What is the Test?
The NT scan is a specialized ultrasound screening test performed during early pregnancy to assess the Nuchal Translucency, which is the fluid-filled space at the back of the baby’s neck. This measurement, combined with maternal age and blood test results, helps assess the risk of chromosomal abnormalities, particularly Down syndrome (trisomy 21) and some other genetic conditions.
Test Procedure:
During the NT scan, the pregnant person lies on an examination table, and a gel is applied to the abdomen. The ultrasound technician or radiologist then uses a transducer to capture images of the fetus. The Nuchal Translucency measurement is taken by identifying the fluid-filled space at the back of the baby’s neck on the ultrasound image.
When to Take the Test:
The NT scan is usually performed between 11 and 14 weeks of gestation, ideally around 12 weeks.
Who Should Take This Test?
The NT scan is offered as a routine screening test to all pregnant individuals, regardless of age, to assess the risk of chromosomal abnormalities in the fetus.
Precautions for Exceptional Cases (Pregnancy etc.):
The NT scan is generally safe for both the pregnant individual and the fetus. However, it’s essential to have the ultrasound performed by a trained healthcare professional.