Serum uric acid.

Data from the 1977 College of American Pathologists (CAP) Comprehensive Chemistry Survey and other programs have been analyzed in an interlaboratory comparison of the measurements of serum uric acid. The majority of clinical laboratories utilize some form of phosphotungstic acid (PTA) oxidation-reduction technic for the measurement of uric acid. Methods based on uricase are most often performed on some automated device. In this Survey, in which specimens containing minimal potential interfering compounds were used, there are no significant differences in the results obtained by phosphotungstic acid and uricase methods.