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Early pregnancy ultrasound measuring fetal neck fluid and nasal bone to screen for chromosomal issues.
An NT-NB scan measures two early fetal features by ultrasound: nuchal translucency (fluid at the back of the fetal neck) and the fetal nasal bone. These measurements are important because they are markers that help estimate the risk of chromosomal conditions such as Down syndrome (trisomy 21) and other anomalies. In twins, each fetus is measured individually, which takes more time and skill. Results are used with maternal blood tests and pregnancy dating to give a combined risk estimate. Abnormal findings do not diagnose a condition but guide the need for further testing and specialist counseling. The scan is typically done between 11 and 13 weeks and 6 days of pregnancy.
Drink water to have a comfortably full bladder before the scan.
The NT-NB Scan (Twins) test evaluates various parameters related to the different components. Here are the main parameters that are checked in the test:
NT-NB Scan (Twins) is part of first‑trimester combined screening and checks each twin for early markers of chromosomal problems. Doctors order it for routine screening, advanced maternal age, abnormal blood screening, or a family history of genetic conditions. It helps detect increased risk for Down syndrome and other anomalies. Abnormal results can come from chromosomal changes, structural differences, poor dating, or maternal factors and usually lead to further testing and counseling.
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Vijay Bisht was friendly, helpful, and made our home test process seamless. Grateful for his timely support and follow-up.
A big thank you to Shikhar from the Visit app for going above and beyond to arrange a last-minute appointment during an urgent situation. His seamless coordination truly made a difference.
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