Diagnostic criteria for severe pancreatitis:

First, based on the patient's clinical symptoms, symptoms such as restlessness, cold limbs, and mottled skin, indicative of shock, may appear.

Second, physical examination signs, such as rigid abdominal muscles indicative of a positive peritoneal irritation sign, and Grey Turner's sign may also be present.

Third, according to laboratory tests, the calcium levels generally significantly decrease, usually below 2 mmol/L, and elevated blood sugar levels greater than 11.2 mmol/L, typically without a history of diabetes. There may also be a sudden decrease in urine amylase.

Fourth, diagnostic abdominal paracentesis reveals ascitic fluid with high amylase activity.

Based on these points, severe pancreatitis can be considered.