title: Normal range of 'effective thyroxine ratio'.
mesh_terms: D003276:Contraceptives, Oral; D004967:Estrogens; D005260:Female; D006801:Humans; D011247:Pregnancy; D013974:Thyroxine / Q000097:blood*
chemical_list: D003276:Contraceptives, Oral; D004967:Estrogens; D013974:Thyroxine