At a Glance
Why Get Tested?
To assess the risk of a foetus having a chromosomal abnormality, such as Down’s syndrome (trisomy 21).
When to Get Tested?
Usually between 11 and 14 weeks of pregnancy.
A blood sample taken from a vein in your arm. Measurement of nuchal translucency (NT) requires a special ultrasound examination to be performed.
Test Preparation Needed?
You may be requested to have a full bladder when having the nuchal translucency ultrasound performed. Having a full bladder when you attend for your scan usually makes it easier to see the baby clearly and measure the nuchal translucency.