title: Plasma levels of norethisterone measured by radioimmunoassay and gas chromatography-mass fragmentography.
mesh_terms: D000284:Administration, Oral; D002849:Chromatography, Gas; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D009640:Norethindrone / Q000008:administration & dosage / Q000097:blood* / Q000494:pharmacology; D011863:Radioimmunoassay
chemical_list: D009640:Norethindrone