Abstract

Simple methods for estimation of the most frequently occurring alkaline phosphatase isoenzymes in serum are evaluated. Methods based on inhibition by l-phenylalanine or denaturation by heat or urea have been adopted for a reaction-rate instrument (LKB 8600) using conditions recommended by the Scandinavian Enzyme Committee, when applicable. The analytical results are directly evaluated for various groups of patients and also used in a mathematical “three-isoenzyme” model. These calculations did not improve the clinical value of the primarily obtained data. Thus, it was concluded that under certain precautions the results obtained in the presence of l-phenylalanine or urea should be used separately.

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