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Allopurinol prescriptions increase in the proportion of patients who excrete a higher level of urine uric acid. Allopurinol prescriptions in stone formers with 24-hour urine test and without gout, before and after 24-hour urine testing, stratified by level of 24-hour urine uric acid excretion. Differences in proportions before and after 24-hour urine test were significant for both levels of 24-hour urine uric acid excretion at P<0.001. Δ, change.
