Measurement of urine porphyrins and porphyrinogens.
D004355:Drug Stability; D006801:Humans; D006863:Hydrogen-Ion Concentration; D011165:Porphyrinogens / Q000652:urine*; D011166:Porphyrins / Q000652:urine*; D013053:Spectrophotometry / Q000379:methods; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
D011165:Porphyrinogens; D011166:Porphyrins