24/09/2026
NT/NB Scan: Why Timing Matters
The NT/NB scan is part of first-trimester ultrasound assessment, and timing matters because NT measurement has a defined gestational window.
It is generally performed between 11 weeks and 13 weeks + 6 days, depending on the clinical assessment and applicable protocol.
If your obstetrician has recommended an NT/NB scan, it is helpful to plan the appointment within the advised window rather than delaying it.
Remember: Screening results should always be interpreted in the context of your pregnancy and discussed with your obstetrician or qualified healthcare professional.