Christiansen, M Inhibin A is a maternal serum marker for Down's syndrome early in the first trimester. [electronic resource] - Clinical genetics Jul 2005 - 35-9 p. digital Publication Type: Journal Article ISSN: 0009-9163 Standard No.: 10.1111/j.1399-0004.2005.00441.x doi Subjects--Topical Terms: Biomarkers--bloodChorionic Gonadotropin, beta Subunit, Human--bloodDown Syndrome--diagnosisFalse Positive ReactionsFemaleHumansInhibins--bloodPregnancyPregnancy Trimester, FirstPregnancy-Associated Plasma Protein-A--analysisPrenatal Diagnosis--methodsReference Values