BUN to creatinine ratio

Ratio used to suggest prerenal azotemia or upper GI bleeding.

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Stable value

Patient values are shared with every calculator.

When to use
  • Azotemia or suspected upper GI bleeding.
Pearls and pitfalls
  • Above 20: prerenal state, GI bleeding, steroids, or high protein intake; 10–20 normal or intrinsic renal.
Why use

Quick supporting clue, not diagnostic alone.

Ratio = BUN (mg/dL) ÷ creatinine (mg/dL)

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