Confirm dating
Check fetal size and whether the examination is within the valid measurement window.
First-trimester assessment
NT / NB Scan
A time-sensitive ultrasound assessment that includes nuchal translucency and nasal-bone review, interpreted within a wider screening conversation.
Book a pregnancy scan
11–14 week windowNT measurementEarly anatomyScreening context
From the reason for the visit to the next useful step.
The exact plan may change with clinical findings, pregnancy stage and individual preference.
- 01
Bring screening records
Carry any blood-test or NIPT result already completed.
- 02
Allow time for position
Obtaining a valid measurement depends on fetal position and image criteria.
- 03
Understand probability
A screening result estimates chance; it does not confirm or exclude every condition.
- 04
Keep the next scan
A later detailed anomaly scan remains important even after reassuring first-trimester screening.
What this examination is designed to review.
Measure NT
Assess the fluid-filled space at the back of the fetal neck.
Review early anatomy
Examine selected structures that can be assessed at this stage.
Discuss the result
Explain whether further screening, diagnostic testing or later specialist imaging is worth considering.
The central idea
A screening assessment is not a diagnosis.
NT measurement contributes information about the chance of certain chromosomal or structural conditions. The result may be considered with maternal age, blood screening or other tests, depending on the care plan.
Questions about nt / nb scan
These answers are general. Individual advice depends on the clinical history and assessment.
Reception can help with appointment details
The measurement is validated within a specific fetal size and pregnancy window, so booking timing matters.
No. Ultrasound and blood-based screening provide different information and may be used together depending on the care plan.
No. It is a marker that may increase the estimated chance and lead to counselling, diagnostic testing or specialist scans.
Yes. First-trimester screening does not replace the detailed mid-pregnancy anatomy assessment.
Fetal position or other factors may make assessment difficult. The sonologist will explain whether more time, a repeat attempt or another screening approach is appropriate.