Obstetrics• Updated 21 October 2026
NT Scan (Nuchal Translucency)
A first-trimester scan between 11 and 14 weeks that helps estimate the chance of Down syndrome and other conditions.
Results: Same day (combined result in a few days)
Quick Summary
Primary Purpose
To screen for chromosomal conditions and check early development.
What It Measures
Fluid at the back of the baby's neck, combined with blood tests (double marker) and age.
Preparation
Usually no special preparation.
Overview
The NT scan is a screening test: it gives a chance, not a diagnosis.
A higher-chance result may lead to NIPT or a diagnostic test.
What It Measures
Nuchal translucency
Fluid thickness at the neck.
Early anatomy
Some major problems.
How It's Performed
- 01
Timing
Done between 11 and 14 weeks.
- 02
Scan
Over the tummy.
- 03
Combined result
With a blood test.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Down Syndrome Tests(opens in a new tab) · MedlinePlus, US National Library of Medicine
- 12-week scan(opens in a new tab) · NHS