Nephrology

Urea Reduction Ratio (URR) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Pre-dialysis BUN (mg/dL)

Post-dialysis BUN (mg/dL)

Result

Complete all required inputs to calculate the score.

Formula inputs

Pre-dialysis BUN (mg/dL)Accepted range: 5 to 200
Post-dialysis BUN (mg/dL)Accepted range: 1 to 100

Primary source

National Kidney Foundation. KDOQI Clinical Practice Guideline for Hemodialysis Adequacy: 2015 update. Am J Kidney Dis. DOI: 10.1053/j.ajkd.2015.07.009. PMID: 26498416. Scope: urea reduction ratio (%) = (pre-dialysis BUN − post-dialysis BUN) / pre-dialysis BUN × 100. (2015)

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