Ranson's Criteria

How to use it

1. 1

   5 criteria at admission. Age, WBC, glucose, LDH, AST.

2. 2

   6 criteria at 48h. Haematocrit fall, BUN rise, calcium, PaO₂, base deficit, fluid sequestration.

3. 3

   ≥3 criteria = severe. CT scan + ICU care indicated.

When to use it

Pancreatitis admission

Ranson ≥3: radiological assessment for necrosis; HDU admission.

BISAP preferred in some units

BISAP (BUN, impaired mentation, SIRS, age>60, pleural effusion) simpler — calculated at admission only.

Interstitial vs. necrotising

CT severity index or CECT at 72h if Ranson ≥3.