The authors suggest a new improved automated method for separate measurements of urinary porphyrins (coproporphyrins and uroporphyrins) in native urine with computer processing of spectral data. The method of dividing the total spectrum of porphyrin fluorescence takes account of background non-porphyrin admixtures in the urine and corrects the data on the basis of regression analysis. The data of this method were compared to those of other widely used methods and were found to be in good correlation; the advantages of the automated method are discussed.
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