Calculators · Gastroenterology & Hepatology · Score

BISAP score

Also called Bedside Index of Severity in Acute Pancreatitis

Five bedside variables in the first 24 hours that predict in-hospital mortality in acute pancreatitis.

BISAP

0 / 5

Mortality rose with each point, from under 1% at the lowest scores to over 20% at the highest (US derivation, 17,992 cases; AUC 0.82 in validation, similar to APACHE II).

Formula and scoring

One point each within 24 h: BUN > 25 mg/dL, impaired mental status, SIRS, age > 60, pleural effusion.

Exam and ward pearls

  • Computable at admission, unlike Ranson (needs 48 h).
  • BUN 25 mg/dL ≈ urea 8.9 mmol/L (BUN × 0.357).

When not to rely on it

  • Predicts death, not local complications; score within the first 24 hours only.

Source

  1. Wu BU, Johannes RS, Sun X, et al. The early prediction of mortality in acute pancreatitis: a large population-based study. Gut. 2008;57(12):1698-703. doi:10.1136/gut.2008.152702 · PMID 18519429

Formula and cut-offs checked against these sources on 8 Nov 2026. Educational tool for clinicians; it does not replace clinical judgement.

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