Methodological Aspects of Examination of 24 Hour Urinary Excretions in Outpatients with Recurrent Urolithiasis

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Abstract
In 85 recurrent stone formers, 2 consecutive 24 h urinary excretions were subjected to chemical examination for calcium, uric acid, magnesium and creatinine. 23 patients had hypercalciuria (greater than 6 mmol/24 h), 22 hyperuricosuria (greater than 3.5 mmol/24 h) and 5 hypomagnesuria (less than 2.4 mmol/24 h). In 1/3 of the cases, the diagnosis would have been missed if based on only one of the two collections, rather than on the mean values from both. Calcium-restricted diet 3 days before and during the sampling is not recommended. Hydrochloric acid appeared to be useful as a preservative and to prevent calcium and magnesium precipitation. No significant seasonal variations were found. Heating of the urine sample before analysis of uric acid did not influence the result.

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