Reference — Gastrointestinal
Pancreatitis Severity & Labs Reference
The enzymes confirm pancreatitis; the supporting labs and the scoring criteria tell you how sick the patient is. Lipase makes the diagnosis — but calcium, BUN, and hematocrit trends predict the trajectory.
Educational use only. Reference ranges and scoring thresholds vary by source and lab; use your facility’s values and clinical context. Severity scoring guides — it does not replace — clinical judgment. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
The Labs
| Lab | Change | Note |
|---|---|---|
| Lipase | ↑ (often ~3× normal) | More specific than amylase; rises early and stays up longer — the key diagnostic enzyme |
| Amylase | ↑ (often ~3× normal) | Rises early, falls within a few days; less specific (other conditions raise it) |
| Calcium | ↓ | Fat saponification binds calcium; hypocalcemia is a SEVERITY marker — watch for tetany |
| Glucose | ↑ | Impaired insulin release from islet damage; may need insulin |
| WBC | ↑ | Inflammation; a new rise later suggests infected necrosis |
| Triglycerides | ↑ (if the cause) | Very high triglycerides can cause pancreatitis |
| ALT / bilirubin | ↑ (gallstone cause) | Elevated ALT points toward a biliary etiology |
Enzyme height does NOT predict severity — scoring systems and trend markers do.
Ranson’s Criteria
At admission
- •Age > 55 years
- •WBC > 16,000/mm³
- •Glucose > 200 mg/dL
- •AST > 250
- •LDH > 350
Within 48 hours
- •Hematocrit drop > 10%
- •BUN rise > 5 mg/dL
- •Calcium < 8 mg/dL
- •PaO₂ < 60 mmHg
- •Base deficit > 4
- •Fluid sequestration > 6 L
More criteria met = higher predicted mortality. The 48-hour markers (especially a rising BUN and falling calcium/hematocrit drop) track the slide toward severe disease.
Trend Markers to Watch
Rising BUN and a rising/persistently high hematocrit reflect inadequate volume against third-spacing — and predict worse outcomes; falling them with fluids is reassuring. CRP (peaks ~48–72 h) tracks inflammation severity. A new WBC rise with fever after the first days suggests infected necrosis.
NCLEX Pearls
- ✦Lipase is the more specific, longer-lasting enzyme — the key diagnostic lab.
- ✦Calcium FALLS in pancreatitis (saponification) and low calcium is a severity sign.
- ✦Enzyme magnitude doesn't equal severity — Ranson's criteria and trend markers do.
- ✦Rising BUN and hematocrit signal under-resuscitation; they should fall with adequate fluids.
- ✦A new fever + rising WBC days in suggests infected pancreatic necrosis.
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with American College of Gastroenterology (ACG) / AGA · ASPEN (nutrition support). It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →