Abstract
In order to make correct diagnosis of acute pancreatitis (AP) and prevention of complications, especially infected pancreatic necrosis (IPN), there were made a wide range of examinations of people with abdominal pain and appropriate anamnesis. Clinical, laboratory and instrumental examination methods were carried out in dynamics during the first 5-7 days of illness. Attention was paid to some laboratory methods (levels of procalcitonin (PCT), amylase, diastasis, ALT, AST) due to results of correlation analysis in our previous researches.