Nuchal Translucency

Nuchal Translucency

The nuchal translucency test is a safe and simple test performed towards the end of the first trimester of a pregnancy. It comprises a blood test and an ultrasound scan and is likely to detect approximately 85 – 90 percent of chromosomal abnormalities, the most common of which is Down Syndrome or Trisomy 21. This ultrasound is performed between 11 weeks 3 days and 13 weeks 6 days with the optimal time being between 12 and 13 weeks. It should be noted a Nuchal Translucency scan does not diagnose chromosomal abnormalities it only calculates risk.

The developing baby has a layer of fluid between the skin and the underlying soft tissues on the back of its body. During the ultrasound a measurement of the thickness of this layer, which is translucent on ultrasound, is performed at the region of the neck and is called the nuchal translucency measurement. This measurement together with your age, weight and blood test results will calculate a risk for chromosomal abnormalities.


This scan requires you to have a full bladder. You will be required to drink 1.0 litre of water starting 90 minutes prior to your appointment and completing 60 minutes prior to your appointment, and do not use the bathroom.

Please bring your request form from your referring practitioner to your appointment.
Please remember to bring all previous X-rays and imaging reports with you to your appointment.

Locations where this service is available

• North Sydney
• Mosman
• Lane Cove
• Hoxton Park
• Miller

North Sydney



Lane Cove

Hoxton Park

Miller Central

Carnes Hill

Macquarie Park