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Alkali prescriptions increase in the proportion of patients who excrete a lower level of urine citrate. Alkali prescriptions in stone formers with 24-hour urine test, before and after 24-hour urine testing, stratified by level of 24-hour urine citrate excretion. Differences in proportions before and after 24-hour urine test were significant for all levels of 24-hour urine citrate excretion at P<0.001. Δ, change.
