Exercise-related hematuria. Findings in a group of marathon runners

A. J. Siegel, C. H. Hennekens, H. S. Solomon and B. Van Boeckel

Sequential urine specimens were obtained from 50 marathon runners before, immediately after, and on three successive days following a marathon race. All prerace samples were normal, but nine (18%) of the 50 postrace urinalyses showed gross (one specimen) or microscopic (eight specimens) hematuria. No formed elements other than RBCs were seen, and all abnormalities cleared by 48 hours. Exercise-related hematuria appears to be a frequent, self-limited, and benign condition. Physicians should be aware of its occurrence and reserve extended testing for cases in which abnormalities persist beyond 48 to 72 hours.

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