Martinhago, Ciro Dresch Accuracy of fetal gender determination in maternal plasma at 5 and 6 weeks of pregnancy. [electronic resource] - Prenatal diagnosis Dec 2006 - 1219-23 p. digital Publication Type: Evaluation Study; Journal Article ISSN: 0197-3851 Standard No.: 10.1002/pd.1592 doi Subjects--Topical Terms: Chromosomes, Human, YDNA--bloodFemaleFetus--embryologyGestational AgeHumansMaleMaternal-Fetal ExchangePregnancyPregnancy Trimester, First--bloodPregnancy-Specific beta 1-Glycoproteins--geneticsReproducibility of ResultsReverse Transcriptase Polymerase Chain ReactionSensitivity and SpecificitySex Determination Analysis--methods