Nuchal Translucency Scan
A specialised scan to assess the risk of chromosomal abnormalities such as Down syndrome. Performed between 11-14 weeks with detailed fetal assessment.
About This Scan
The nuchal translucency (NT) scan is a specialised ultrasound performed between 11 and 14 weeks of pregnancy (ideally 12.5–13.5 weeks) to help estimate the risk of your baby having Down syndrome or other chromosomal abnormalities.
Important: The NT scan is an assessment screening test, not a diagnosis. It helps identify babies who may be at higher risk and might benefit from further testing. A normal result does not guarantee your baby doesn't have a chromosomal condition, and an increased measurement doesn't mean your baby definitely does.
What Is Nuchal Translucency?
Nuchal translucency refers to the small collection of fluid at the back of your baby's neck. All babies have some fluid here, but babies with chromosomal abnormalities such as Down syndrome often have a slightly increased amount.
Understanding the Results
Without blood tests: An NT measurement of ≤ 3mm is generally considered within the normal range.
For more accurate screening: NT measurement is more effective when combined with blood tests measuring two hormones (β-hCG and PAPP-A). This is called "combined first trimester screening" and provides a more accurate risk assessment.
We do not offer blood tests at our centre. Please speak to your GP or hospital about arranging blood work if you want combined screening.
Important Information
What If the Measurement Is Increased? An increased NT measurement doesn't mean your baby definitely has a chromosomal abnormality. Many babies with slightly increased measurements are completely healthy. However, further testing may be recommended, such as combined screening (blood tests), NIPT (non-invasive prenatal testing), or amniocentesis or CVS (diagnostic tests). Your GP or consultant will discuss options with you.
When Is the Best Time to Have This Scan?
Ideal timing: 12.5–13.5 weeks
The nuchal translucency can only be measured accurately within a specific window:
- Earliest: 11 weeks + 2 days
- Latest: 13 weeks + 6 days
- Optimal: 12.5–13.5 weeks (baby is the ideal size for measurement)
What We Check
- Measure the nuchal translucency (fluid at the back of baby's neck)
- Check for presence or absence of the nasal bone
- Look for any physical abnormalities
- Take detailed measurements of your baby
- Assess gestational age and provide due date estimate
- Check for single or multiple pregnancy
- Assess fetal heartbeat and movement
What's Included
- Detailed ultrasound examination
- Nuchal translucency measurement
- Assessment of nasal bone
- Fetal anatomy review (as visible at this gestation)
- Medical obstetric ultrasound report
- Glossy keepsake photo
Why You Might Need This Scan
- •Want screening for chromosomal abnormalities
- •Are over 35 (risk increases with maternal age)
- •Have a family history of chromosomal conditions
- •Want detailed measurements and information about your baby's development
What to Expect
Before Your Scan
Attend with a mildly filled bladder. Know your last menstrual period or established due date. Wear comfortable, loose-fitting clothing.
Preparation checklist:
- Mildly filled bladder
- Bring your due date if already established
- Wear loose, comfortable clothing
- Arrive 10 minutes early
During the Scan
You'll lie comfortably on an examination table. The sonographer applies warm gel to your abdomen and uses a high-resolution ultrasound probe to capture detailed images.
The sonographer will carefully measure the fluid at the back of your baby's neck. This requires baby to be in a specific position — sometimes we need to wait for baby to move, or gently encourage movement.
You'll see your baby on a large screen and the sonographer will explain what they're measuring and looking for.
The scan typically takes 20-30 minutes.
After Your Scan
You'll receive immediate verbal results explaining the NT measurement and what it means. You'll also receive a medical obstetric report and a keepsake photo. If the measurement is outside the normal range, your sonographer will discuss next steps, which may include speaking with your GP about blood tests or further screening options.
Pricing
Nuchal Translucency Scan: €150
Twins: +€100
Cancellation: We require 24 hours notice for cancellations or rescheduling.
Frequently Asked Questions
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