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BISAP: acute pancreatitis severity

Hepatology & GI

Five bedside items in the first 24 h. Simpler than Ranson and as accurate for mortality.

What you enter

  • BUN >25 mg/dL (urea >8.9 mmol/L) (+1)
  • Impaired mental status (+1)
  • SIRS (≥2 of: T <36 or >38, HR >90, RR >20 or PaCO₂ <32, WCC <4 or >12) (+1)
  • Age >60 (+1)
  • Pleural effusion on imaging (+1)
FORMULAOne point each: BUN >25, impaired mentation, SIRS, age >60, pleural effusion
SourceWu BU et al. The early prediction of mortality in acute pancreatitis: a large population-based study. Gut 2008;57:1698-703ReviewedFormula and thresholds checked against the source on 2026-08-22. If the source updates, this line will say so.