What is the Ranson Criteria used for?

The Ranson Criteria predicts the severity and mortality risk of acute pancreatitis using 11 clinical and laboratory variables: 5 assessed at admission and 5 assessed at 48 hours. Scores below 3 suggest mild disease; scores of 3 or more indicate significant risk of complications and death.

What is the difference between the admission criteria and the 48-hour criteria?

The five admission criteria (age, WBC, glucose, LDH, AST) reflect the initial physiologic insult and are recorded at presentation. The five 48-hour criteria (hematocrit fall, BUN rise, calcium, PaO2, base deficit, fluid sequestration) reflect ongoing organ dysfunction and third-space losses, which often predict eventual severity more accurately than admission findings alone.

What mortality rate corresponds to each score range?

Score 0–2: less than 1% mortality (mild pancreatitis). Score 3–4: approximately 15% mortality (moderate). Score 5–6: approximately 40% mortality (severe). Score 7–8: approximately 100% mortality (critical). These are population-level estimates; individual patient outcomes vary based on comorbidities and management.

Can the Ranson Criteria be used for gallstone pancreatitis?

The original Ranson Criteria were developed for non-gallstone (alcoholic) pancreatitis. Modified criteria exist for gallstone-related pancreatitis, with slightly different thresholds (e.g., age > 70, glucose > 220 mg/dL, LDH > 400 IU/L, AST > 250 IU/L). This calculator uses the original Ranson thresholds; clinicians should note the etiology when applying the score.

Is this tool a substitute for clinical judgment?

No. This calculator is for educational and informational purposes only. All decisions regarding pancreatitis management — including ICU admission, fluid resuscitation, and imaging — must be made by qualified healthcare professionals with full assessment of the patient's clinical status, imaging, and comorbidities.

What other scoring systems can be used for acute pancreatitis?

Other commonly used systems include the APACHE II score (applicable to many ICU conditions), the Bedside Index of Severity in Acute Pancreatitis (BISAP), the CT Severity Index (CTSI), and the Revised Atlanta Classification. Each has different timing requirements and data needs. The Ranson score is notable for requiring no imaging and being calculable at the bedside.

Ranson Criteria Calculator

Name: Ranson Criteria Calculator
Availability: InStock
Author: Nham Vu

Enter five admission criteria and five 48-hour criteria to calculate the Ranson score and estimate mortality risk in acute pancreatitis.

For educational use only. Not a substitute for clinical judgment. All pancreatitis management decisions must be made by qualified clinicians based on full patient assessment.

At Admission (5 criteria)

Recorded at the time of hospital admission.

Age Scores 1 if > 55 years

years

White Blood Cell Count Scores 1 if > 16,000/mm³

/mm³

Blood Glucose Scores 1 if > 200 mg/dL (11.1 mmol/L)

mg/dL

Serum LDH (Lactate Dehydrogenase) Scores 1 if > 350 IU/L

IU/L

Serum AST (Aspartate Aminotransferase) Scores 1 if > 250 IU/L

IU/L

At 48 Hours (5 criteria)

Reassessed 48 hours after admission. Leave blank if not yet available.

Hematocrit Fall Scores 1 if fall ≥ 10 percentage points

% points

Enter the absolute drop in hematocrit (admission minus 48-hour value).

BUN Rise Scores 1 if rise > 5 mg/dL

mg/dL

Enter the increase in BUN from admission to 48 hours (48h minus admission value).

Serum Calcium Scores 1 if < 8 mg/dL (2.0 mmol/L)

mg/dL

PaO₂ (Arterial Oxygen) Scores 1 if < 60 mmHg

mmHg

Base Deficit Scores 1 if > 4 mEq/L

mEq/L

Enter as a positive number (e.g., enter 5 if base deficit is -5).

Estimated Fluid Sequestration Scores 1 if > 6 L

liters

Enter the criteria above
and click Calculate.

Score Interpretation & Mortality Risk

0 – 2

Mild

< 1% mortality

Low risk. Standard ward care.

3 – 4

Moderate

~15% mortality

Significant risk. Stepdown or HDU care.

5 – 6

Severe

~40% mortality

High risk. ICU admission warranted.

7 – 11

Critical

> 99% mortality

Critical. Intensive intervention required.

Summary

Enter five admission criteria and five 48-hour criteria to calculate the Ranson score and estimate mortality risk in acute pancreatitis.

How it works

Enter the five criteria assessed at hospital admission: age, white blood cell count, blood glucose, serum LDH, and AST.
Enter the five criteria assessed 48 hours after admission: hematocrit fall, BUN rise, serum calcium, PaO2, base deficit, and fluid sequestration.
Each criterion present scores 1 point; the maximum total is 11 points.
The calculator sums all positive criteria and displays the total Ranson score.
Interpret the result using the mortality risk bands: score 0–2 (mild, <1%), 3–4 (moderate, ~15%), 5–6 (severe, ~40%), 7+ (critical, >99%).
Use the score alongside clinical judgment to guide decisions about ICU admission and level of care.

Use cases

Estimate early mortality risk in patients admitted with acute pancreatitis.
Support decisions about ICU admission or step-down care based on disease severity.
Communicate pancreatitis severity to consulting surgical or gastroenterology teams.
Triage high-risk patients for early aggressive fluid resuscitation and monitoring.
Serve as an educational reference for medical students and residents learning pancreatitis management.
Use serially with 48-hour reassessment to track progression of disease severity.
Complement imaging findings (CT severity index) in assessing pancreatic necrosis risk.
Document severity at admission for audit, research, and quality improvement purposes.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu

Ranson Criteria Calculator

At Admission (5 criteria)

At 48 Hours (5 criteria)

Ranson Score

Criterion Breakdown

Management Guidance

Score Interpretation & Mortality Risk

Summary

How it works

Use cases

Frequently Asked Questions

What is the Ranson Criteria used for?

What is the difference between the admission criteria and the 48-hour criteria?

What mortality rate corresponds to each score range?

Can the Ranson Criteria be used for gallstone pancreatitis?

Is this tool a substitute for clinical judgment?

What other scoring systems can be used for acute pancreatitis?

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