title: First-trimester reference intervals for thyrotropin, free thyroxine, free thyroxine index and thyroxine for the Beckman Coulter UniCel® DxI 800 and Roche Modular Analytics E170 analyzers.
authors.forename: Sara P
authors.initials: SP
authors.lastname: Wyness
authors.forename: Sonia L
authors.initials: SL
authors.lastname: La'ulu
authors.forename: William L
authors.initials: WL
authors.lastname: Roberts
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy; D012015:Reference Standards; D013972:Thyrotropin / Q000032:analysis*; D013974:Thyroxine / Q000032:analysis*
chemical_list: D013972:Thyrotropin; D013974:Thyroxine