99% Accurate: What Does it Really Mean??

Cell-free DNA (cfDNA), also going by the monikers of Noninvasive Prenatal Testing (NIPT) and Noninvasive Prenatal Screening (NIPS), screens for a handful of genetic conditions. The detection rate of cfDNA is high for many of these conditions, especially for Down syndrome. Many labs boast that their cfDNA is “greater than 99% accurate”. So what does …

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