Nuchal Translucency (NT) Scan
The NT scan is a first-trimester ultrasound performed during approximately 11–14 weeks of pregnancy. It measures the fluid-filled space at the back of the baby’s neck and also assesses early fetal development, growth and anatomy. NT measurement can be used as part of screening for certain chromosomal conditions and should be interpreted together with other screening information when applicable.
NT Measurement
Detailed Fetal Assessment
Nuchal Translucency (NT) Scan
Nuchal Translucency Measurement
Fetal Growth & Measurements
Gestational Age
Fetal Cardiac Activity
Early Fetal Anatomy
Nasal Bone & Facial Profile
Number of Fetuses
Placenta & Amniotic Fluid
Early Structural Assessment
Chromosomal Risk Screening
When Is It Recommended?
The NT scan is generally performed during the 11–14 week period of pregnancy. NT measurement is commonly performed between 11 weeks and 13 weeks + 6 days, depending on the baby's size and the scanning protocol.
- It helps assess early fetal growth and development.
- It provides an opportunity to measure nuchal translucency.
- It helps confirm gestational age and assess fetal viability.
- It can assess whether there is one baby or more than one.
- It provides an early review of selected fetal anatomical structures.
- It may form part of a screening assessment for chromosomal conditions.
- Your doctor will advise whether additional blood tests or other screening options are appropriate for you.
Important Information
The NT scan is a screening examination, not a diagnostic test. A higher or lower NT measurement does not by itself confirm or exclude a chromosomal or structural condition. Results should be interpreted together with other clinical and screening informati
- NT measurement is most useful when performed within the appropriate gestational-age window and using standardized technique.
- A higher NT measurement may be associated with an increased chance of certain chromosomal or structural conditions, but many babies with increased NT are healthy.
- A normal NT measurement cannot guarantee that the baby has no genetic or structural condition.
- Additional screening or diagnostic testing may be recommended depending on the findings and individual risk assessment.
- The first-trimester scan does not replace the detailed mid-trimester anomaly scan.
- Your doctor or fetal medicine specialist will explain the results and recommend appropriate follow-up when required.