title: Relationship of urinary metabolites of theophylline to serum theophylline levels.
mesh_terms: D000368:Aged; D003640:Dealkylation; D006801:Humans; D008433:Mathematics; D008875:Middle Aged; D008954:Models, Biological; D013806:Theophylline / Q000097:blood / Q000378:metabolism* / Q000652:urine; D014527:Uric Acid / Q000031:analogs & derivatives / Q000097:blood / Q000652:urine; D014970:Xanthines / Q000097:blood
chemical_list: D014970:Xanthines; D014527:Uric Acid; D013806:Theophylline