How accurate is the combined nuchal translucency scan?

A widely available type of the combined test - which utilises the nuchal translucency and the blood test for b-HCG and PAPP-A - will identify more than 80% of babies with Down's syndrome.

We offer a more detailed test which combines the above (nuchal translucency and blood hormones) with determination of the baby's heart rate, nasal bone, tricuspid flow and ductus venosus flow. This test will identify more than 90% of babies with Down's Syndrome.

Alternatively you could choose a different screening test such as the Non Invasive Prenatal Test which will identify 99% of babies with Down's syndrome.