Noninvasive Fetal Sex Determination Using Cell-Free Fetal DNA.
The study concluded that "Despite interstudy variability, performance was high using maternal blood. Sensitivity and specificity for detection of Y chromosome sequences was greatest using RTQ-PCR after 20 weeks' gestation. Tests using urine and tests performed before 7 weeks' gestation were unreliable. "
Source: Diana W. Bianchi, M.D., executive director, Mother Infant Research Institute, Tufts Medical Center, Boston; Susannah Baruch, J.D., policy consultant, Generations Ahead; August 10, 2011 Journal of the American Medical Association
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