Abstract
A colorimetric method is described for the measurement of serum lactic dehydrogenase (LDH) activity. The method employs phenazine methosulfate to mediate electron transfer between reduced diphosphopyridine nucleotide and 2,6-dichloroindophenol, and allows continuous measurement of the reaction rate in the direction lactate to pyruvate. The LDH of a number of normal and pathologic sera was measured by the present method and by the ultraviolet spectrophotometric method. Agreement between the two methods is good.

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