title: New method for direct determination of "true" creatinine.
mesh_terms: D003404:Creatinine / Q000097:blood*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008722:Methods; D010851:Picrates; D013053:Spectrophotometry; D013696:Temperature; D013997:Time Factors
chemical_list: D010851:Picrates; D003404:Creatinine