title: Increase in apparent theophylline concentration in the serum of two patients as measured by some immunoassay methods (caused by 1,3-dimethyluric acid?)
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005189:False Positive Reactions; D006801:Humans; D007124:Immunoenzyme Techniques; D011933:Reagent Kits, Diagnostic; D013806:Theophylline / Q000097:blood*; D014511:Uremia / Q000097:blood*; D014527:Uric Acid / Q000031:analogs & derivatives*
chemical_list: D011933:Reagent Kits, Diagnostic; D014527:Uric Acid; D013806:Theophylline; C031274:1,3-dimethyluric acid