BUN/Creatinine Ratio Calculator
Reports the BUN/creatinine ratio with limitations for AKI assessment
When to use it
Use to help differentiate prerenal azotemia from intrinsic kidney disease.
Category
Acute Kidney Injury (AKI) Workup
References
- Morgan DB et al. Plasma creatinine and urea: creatinine ratio in patients with raised plasma urea. Br Med J. 1977;2:929-32. PMID: 912370
- Hosten AO. BUN and Creatinine. In: Walker HK, Hall WD, Hurst JW, eds. Clinical Methods. 3rd ed. Butterworths; 1990:874-878. https://www.ncbi.nlm.nih.gov/books/NBK305/
- Uchino S, Bellomo R, Goldsmith D. The meaning of the blood urea nitrogen/creatinine ratio in acute kidney injury. Clin Kidney J. 2012;5(2):187-191. PMID: 29497527
- Simadibrata DM, Koo TH, Murlidhar M, et al. Blood Urea Nitrogen-to-Creatinine Ratio to Differentiate Upper From Lower Gastrointestinal Bleeding: A Systematic Review and Meta-Analysis. J Gastroenterol Hepatol. 2026;41(2):477-487. PMID: 41555211
About NephroMind
This calculator is part of NephroMind, a free clinical decision-aid platform from the Arab Society of Nephrology and Renal Transplantation (ASNRT) — over 128 bedside nephrology calculators plus a renal drug-dosing database, coded by a practicing transplant nephrologist.