title: Radioimmunoassay results for phenytoin in serum increased by abnormally high concentrations of free acids in external quality-control samples.
mesh_terms: D016718:Arachidonic Acid; D001095:Arachidonic Acids; D004355:Drug Stability; D005230:Fatty Acids, Nonesterified; D006801:Humans; D010672:Phenytoin / Q000097:blood*; D011786:Quality Control; D011863:Radioimmunoassay / Q000592:standards*; D011933:Reagent Kits, Diagnostic / Q000592:standards*
chemical_list: D001095:Arachidonic Acids; D005230:Fatty Acids, Nonesterified; D011933:Reagent Kits, Diagnostic; D016718:Arachidonic Acid; D010672:Phenytoin