title: Oral contraceptives and the N.B.T. test.
mesh_terms: D003276:Contraceptives, Oral; D005260:Female; D006801:Humans; D011247:Pregnancy; D011258:Pregnancy Tests; D013778:Tetrazolium Salts
chemical_list: D003276:Contraceptives, Oral; D013778:Tetrazolium Salts