![]() MaterniT21 claims a 99.4% accuracy rate for fetal gender - or 6 errors per 1,000 tests. The danger is when the tests are perceived as perfect, and parents consider aborting without confirmation from CVS and amnio. then you can see that even odds as low as 1 in 1,000 can affect you.īut there is no doubt MaterniT21, and other NIPTs, are a huge advance over maternal serum screening (MSS) and nuchal translucency (NT) scanning. If you have worried about having a baby with Downs, or you know someone with a Downs baby. Put another way: Down Syndrome occurs in about 1 in 1,000 births. (Note that other abnormalities screened by the test have different error rates.) At the given rates, that means there were around 2,250 cases of Downs that were undetected, and 250 false positives. Those numbers may sound small, but according to Sequenom, MaterniT21 has performed over 250,000 tests. 1% false positive rate, so 1 in 1,000 parents who receive a positive result for Downs Syndrome actually have a healthy baby.
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