NEW YORK (GenomeWeb) — Though the reported specificity of sequencing-based non invasive prenatal screening tests is generally more than 99 percent, this doesn't mean that false positive rates will be below one percent for all the disorders these tests now target. In fact, depending on the abnormality in question and the gestational age of a fetus, false positive rates could be as much as 50 percent or more, according to recently published research.

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