Free thyroxine index.
D003276:Contraceptives, Oral; D005260:Female; D006801:Humans; D011247:Pregnancy; D013959:Thyroid Diseases / Q000097:blood; D013960:Thyroid Function Tests; D013974:Thyroxine / Q000097:blood*
D003276:Contraceptives, Oral; D013974:Thyroxine