Severe acute pancreatitis (SAP) is one of the main causes of intra-abdominal hypertension (IAH). SAP mortality remains high, between 15% and 30% and is the result of infection of pancreatic necrosis and multiple system organ failure (MSOF). Early recognition of increased intra-abdominal pressure is essential in the management of acute pancreatitis and may reduce the morbidity and mortality associated with this disease. Procalcitonin (PCT) is an indicator that identifies sepsis and also an important marker of severe forms of acute pancreatitis. Research is directed towards finding a single marker that can be quickly measured, in a repeated way, cheap and without leading to discomfort in patients. This study compares the maximum values of PCT and intra-abdominal pressure (IAP) in the patients with acute pancreatitis.