Divide blood urea nitrogen by serum creatinine in US milligram-per-decilitre units.
| BUN / Cr | – |
Use this calculator for BUN / creatinine when both labs are in mg/dl. A high ratio is a pre-renal sketch and a GI-bleed folklore number; it is not a diagnosis. Urea reported in mmol/L needs a different conversion and is not applied here.
BUN: Blood urea nitrogen, mg/dl.
Creatinine: Serum creatinine, mg/dl.
BUN / Cr: Dimensionless ratio.
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