Nuchal Scan

The Nuchal Translucency (NT) scan is an important screening test performed in early pregnancy, usually between 11 weeks + 3 days and 13 weeks + 6 days. This ultrasound measures the fluid space at the back of your baby’s neck. A larger-than-normal measurement can sometimes be linked with chromosomal conditions such as Down’s syndrome (trisomy 21), Edwards’ syndrome (trisomy 18), and Patau’s syndrome (trisomy 13).

The scan is normally carried out across the tummy (transabdominally), though a transvaginal scan may be recommended if clearer images are needed. It is often combined with a maternal blood test, which together make up the combined screening test routinely offered to all pregnant women.

What are the aims of the nuchal scan?

The main purpose of the nuchal scan is to:

Assess the risk of chromosomal conditions such as Down’s, Edwards’ and Patau’s syndromes.
Measure the nuchal translucency and analyse maternal blood markers for more accurate results.
Offer early insight into your baby’s health and development.

It’s important to remember that this is a screening test. It highlights whether the chance of certain conditions is higher or lower but does not give a diagnosis.

What if the nuchal translucency measurement is increased?

A measurement of 3.5mm or more is considered above the average range and may indicate:

A higher chance of chromosomal or genetic conditions
Possible physical concerns, such as heart defects

If this happens, your doctor will discuss the next steps with you. These may include:

Non-Invasive Prenatal Testing (NIPT): a simple maternal blood test that analyses fetal DNA.
Chorionic Villus Sampling (CVS): a diagnostic test involving a sample from the placenta.
Amniocentesis: a diagnostic test that analyses amniotic fluid.
Early fetal cardiac scan
Early fetal anatomy scan

These follow-up tests can provide clearer answers about your baby’s health.

What if my scan shows an increased chance of a chromosomal condition?

If your results suggest a higher chance, your care team will discuss further testing options, which may include NIPT, CVS, or amniocentesis. These diagnostic tests can provide more certainty and guide you on the next steps.

What comes after the nuchal scan?

If your results indicate a low risk, the next standard scan is the anomaly scan, usually performed between 20–22 weeks. This detailed ultrasound looks closely at your baby’s anatomy to check for structural differences or abnormalities.
If your results suggest a higher risk, you may be referred for additional tests or scans sooner.

Cost of a nuchal scan

For the latest pricing, please see our Fees & Services page or contact our team directly.

Important information about your nuchal scan appointment

Duration: About 1 hour for singleton pregnancies.
Preparation: Please arrive 30 minutes early for the blood test (free ß-hCG and PAPP-A).
Performed by: A doctor certified by the Fetal Medicine Foundation (FMF) for nuchal assessment.
Results: A full written report is provided immediately, and can also be sent to your referring doctor.
Images: Both 2D (black-and-white) and 3D (colour) images are included at no extra cost.
Second opinion: If you are attending for a second opinion, please bring your previous reports with you.
Cervical assessment: If required, a transvaginal cervical scan may be carried out for an additional fee.