文摘
The recent discovery of circulating free fetal DNA in maternal blood followed by major technological advances in genome sequencing led to a significant increase in screening efficiency for trisomies 13, 18, and 21. However, we are witnessing a general trend to screen for more abnormalities including microdeletions. This article relies on published data to analyze true analytical performance of these tests, and emphasizes on technical and biological issues to help understand actual recommendations for a focused use of noninvasive screening.