Diagnosing acute pancreatitis can be difficult because the signs and symptoms of pancreatitis are similar to other medical conditions. The diagnosis is usually based upon a medical history, physical examination, and the results of diagnostic tests. Two of the following three are required to make a diagnosis: (1) typical abdominal pain; (2) threefold or more elevation of pancreatic enzyme values in the blood; and (3) inflammation of the gland on computed tomography (CT) scan or magnetic resonance imaging (MRI) scan. The number and type of tests is tailored to the severity of acute pancreatitis and the most likely underlying causes. (See "Clinical manifestations and diagnosis of acute pancreatitis" .)
Finally, the kidneys produce the enzyme renin to prevent the body’s blood pressure from becoming too low. The kidneys rely on a certain amount of blood pressure to force blood plasma through the capillaries in the glomerulus. If blood pressure becomes too low, cells of the kidneys release renin into the blood. Renin starts a complex process that results in the release of the hormone aldosterone by the adrenal glands. Aldosterone stimulates the cells of the kidney to increase their reabsorption of sodium and water to maintain blood volume and pressure.