[Circadian rhythm of uric acid levels of the serum in gout].

Uric acid concentration in the serum was investigated 3 times a day using the uricase method in 15 gout inpatients on a hypopurine diet with age- and sex-adjusted caloric content. The highest uric acid concentration was noted at 7 a. m., the lowest concentration value at 11 p. m. The highest renal clearance values were noted from 7 a. m. till 3 p. m., the lowest ones from 11 p. m. till 7 a. m. Similar regularities were noted in 15 rheumatoid arthritic patients, however uric acid concentration in the serum was lower and its renal excretion was 1.7 times more effective.