Nuchal Translucency Scan

(11-14 weeks)
The NT Scan is a non-invasive test for detecting markers that provide information on your risk for chromosomal abnormalities.


The most accurate non-invasive test for detecting ‘soft’ markers or chromosomal defects during pregnancy is the measurement of the nuchal translucency (NT) and nose bone with an ultrasound examination between 11 to 14 weeks of pregnancy.

The scan detects an increased risk of carrying genetic problems such as Downs Syndrome.

Woman over the age of 35yrs have an increased risk.


The test is performed between 11 weeks and 13 weeks 6 days into your pregnancy with a foetal measurement between 45mm and 85mm.

Interesting facts

  • The embryo measures about 45-85mm excluding legs
  • The foetus will resemble a tiny human though the large head and bony features will mimic an “alien”
  • It is the size of an avocado
  • Nail beds, taste buds and tear ducts are forming.

What to expect

Wear loose clothing-you will be asked to lower your clothing (quite low)