In a meta-analysis appearing online this week in the Journal of the American Medical Association, Johns Hopkins University's Stephanie Devaney and her colleagues review the "overall test performance of noninvasive fetal sex determination using cell-free fetal DNA." In analyzing 80 data sets from 57 studies, the team found that, "despite interstudy variability, [test] performance was high using maternal blood." Devaney et al.

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