An NT/NB scan, also known as a nuchal translucency scan, is a type of prenatal ultrasound performed during pregnancy. It is typically done between 11 and 13+6 weeks of gestation and is used to:

• Screen for chromosomal abnormalities such as Down syndrome, Edwards syndrome, and Patau syndrome.
• Assess the baby’s development and look for any structural abnormalities.
• Measure the nuchal translucency (NT), which is the fluid-filled space at the back of the baby’s neck. An increased NT can be a sign of a chromosomal abnormality.

NT/NB Scan ultrasound The NT/NB scan is not diagnostic, but it can help to identify pregnancies at an increased risk of having a baby with a chromosomal abnormality. If the scan results are abnormal, further testing, such as amniocentesis or chorionic villus sampling (CVS), may be recommended. Here are some additional details about NT/NB scans: Who should get an NT/NB scan? All pregnant women are offered an NT/NB scan, but it is especially important for women who are considered to be at high risk of having a baby with a chromosomal abnormality, such as women who are over 35 years old or who have a family history of chromosomal abnormalities. How is the scan performed? The NT/NB scan is performed by a trained sonographer using an ultrasound machine. The sonographer will gently move the ultrasound probe over your abdomen to get a clear view of your baby. The scan is usually painless and takes about 20 minutes. What are the risks of the scan? There are no known risks associated with NT/NB scans. If you are pregnant, it is important to talk to your doctor about whether an NT/NB scan is right for you.