What is an NT scan?

NT scan stands for nuchal translucency scan, It is a safe and non-invasive test performed during the first trimester of pregnancy. This ultrasound test detects the risk of several chromosomal abnormalities in the developing baby. It includes Down’s syndrome, a congenital cardiac condition, Edward’s syndrome, or Patau syndrome. 

During this test, a healthcare professional checks the fluid-filled space at the back of the growing baby’s neck. The results of the NT scan may not be definitive since it is not a diagnostic test. With a 70% accuracy rate, an NT scan alone does not provide conclusive results. Doctors conduct other tests to calculate the risk involved. 

What is the NT scan used for?

An NT scan is typically performed between weeks 11 and 14 of pregnancy. It measures the translucency or thickness of the fluid build-up behind the neck of a developing baby. The results could indicate chromosomal abnormalities such as Down’s syndrome, Edward’s syndrome, Patau syndrome, or a congenital cardiac disorder. The NT scan does not provide a definite result; it only shows if the baby is at high or low risk.

How are the results of an NT scan understood?

NT scan results are presented as chances. For instance, a chance of 1 in 1000 indicates low risk, with a smaller second number signifying higher risk (e.g., 1 in 150 as high risk). Factors like blood test results, maternal age, gestational age, and nuchal translucency measurement influence interpretation.