International, consensus-based definitions of severity of acute pancreatitis
| Severity | Definition |
| Mild | No organ failure, local or systemic complications and usually resolves in first week |
| Moderate | Transient organ failure, local complications or exacerbation of comorbid disease |
| Severe | Persistent organ failure (>48 hours) |
Local complications include peripancreatic fluid collections, pancreatic and peripancreatic necrosis (sterile or infected), pseudocyst, and walled-off necrosis.19