FIELD: medicine. SUBSTANCE: method involves making single intravenous drop infusion of 250 mg of 5-fluoruracyl dissolved in 200 ml of 5% glucose solution. Significant pain syndrome regression appearing 15-20 min later from the beginning of the infusion is differential sign of acute pancreatitis. No positive dynamic changes being observed in patient state, large probability of perforated gastric or duodenal ulcer is to be concluded. EFFECT: high reliability of diagnosis; simplified and low cost method. 1 tbl
