Ranson score = 1 point for each criterion met. The original non-gallstone score has 5 admission criteria and 6 criteria assessed during the first 48 hours.

Timing	Criterion	Points
Admission	Age >55 years	1
Admission	WBC >16 × 10⁹/L	1
Admission	Glucose >11.1 mmol/L (>200 mg/dL)	1
Admission	LDH >350 U/L	1
Admission	AST >250 U/L	1
First 48 hours	Haematocrit fall >10 percentage points	1
First 48 hours	BUN rise >5 mg/dL (>1.8 mmol/L)	1
First 48 hours	Total calcium <2.0 mmol/L (<8.0 mg/dL)	1
First 48 hours	Arterial PaO₂ <60 mm Hg	1
First 48 hours	Base deficit >4 mEq/L	1
First 48 hours	Fluid sequestration >6 L	1

Total score range: 0–11.

Ranson's Criteria for Acute Pancreatitis Mortality