How reliable is the Nuchal Translucency test?
The Nuchal Translucency test is only a screening test, that aims to give a risk of a particular woman having a baby with a chromosomal disorder or certain other birth defects. A low risk cannot exclude Down Syndrome or other chromosomal disorders, as it is only a screening test, not a diagnostic test. In the best studies published so far, when combined with assessing the nasal bone and/or tricuspid flow and a blood test called PAPP-A and Free Beta, the test was able to diagnose 95% of babies with Down syndrome and 80% or more of most other chromosomal disorders.
