What is nuchal translucency (NT)?
Nuchal translucency (NT) is a thin layer of fluid at the back of the fetal neck that is measured by ultrasound in early pregnancy. This measurement is one of the main components of first-trimester screening.
When is it done?
NT is measured between 11 and 13⁺⁶ weeks, when the fetal crown-rump length (CRL) is 45–84 mm. The scan is most informative precisely at this stage. Radiologist Lana Ezieshvili performs the measurement with a precise technique, following the standards.
What does the scan assess?
- the thickness of the nuchal translucency (NT);
- the presence of the nasal bone;
- the exact term of the pregnancy (by CRL);
- the basic anatomy of the fetus.
NT is often assessed together with biochemical tests (PAPP-A, free β-hCG) and maternal age — the so-called combined screening.
What does an increased NT mean?
Normally the NT is usually less than 3 mm (depending on the term). An increased value raises the risk of chromosomal abnormalities (such as Down syndrome) or cardiac changes, but this is not a diagnosis — it is a risk assessment. If necessary, additional tests are ordered.
Conclusion
The NT scan is an important part of early pregnancy screening and is performed within a strictly defined window. To have it done on time, book a visit with radiologist Lana Ezieshvili.
This information is for educational purposes and does not replace a doctor’s consultation.