APACHE II scale
Equation includes the following factors: age, rectal temperature, mean arterial pressure, heart rate, PaO2, arterial pH, serum potassium, serum sodium, serum creatinine, hematocrit, white blood cell count, Glasgow Coma Scale score, chronic health status
Scoring: Can be calculated athttp://www.sfar.org/scores2/apache22.html#calcul
CT Severity Index
CT grade
A is normal pancreas (0 points)
B is edematous pancreas (1 point)
C is B plus mild extrapancreatic changes (2 points)
D is severe extrapancreatic changes plus one fluid collection (3 points)
E is multiple or extensive fluid collections (4 points)
Necrosis score:
	None (0 points)
	> One third (2 points)
	< One third but less than one half (4 points)
	> One half (6 points)
Scoring: CT grade + necrosis score
Imrie scoring system
Age > 55 years
White blood cell count > 15,000 per mm3 (15.0 × 109 per L)
Blood glucose > 180 mg per dL (10 mmol per L) in patients without diabetes
Serum lactate dehydrogenase > 600 U per L
Serum AST or ALT > 100 U per L
Serum calcium < 8 mg per dL
PaO2 < 60 mm Hg
Serum albumin < 3.2 g per dL (32 g per L)
Serum urea > 45 mg per dL (16.0 mmol per L)
Scoring: One point for each criterion met 48 hours after admission
Ranson's criteria
At admission or diagnosis:
	Age > 55 years
	White blood cell count > 16,000 per mm3 (16.0 × 109 per L)
	Blood glucose > 200 mg per dL (11.1 mmol per L)
	Serum lactate dehydrogenase > 350 U per L
	AST > 250 U per L
During initial 48 hours:
	Hematocrit decrease > 10 percent
	Blood urea nitrogen increase > 5 mg per dL (1.8 mmol per L)
	Serum calcium < 8 mg per dL (2 mmol per L)
	Base deficit > 4 mmol per L (4 mEq per L)
	Fluid sequestration > 6,000 mL
	PaO2 < 60 mm Hg
Scoring: One point for each criterion met