How is investigation of chronic pancreaitits?

Measurement of pancreatic products in blood    A. Enzymes    B. Pancreatic polypeptide Measurement of pancreatic exocrine secretion    A. Direct measurements : CCK/secretin stimulation 1. Enzymes      2. Bicarbonate    B. Indirect measurement      Bentiromide test  : PABA excretion (urine) Paraaminobenzoic acid.     Schilling test     : Vit B12 absorption Fecal fat, chymotrypsin, or elastase concentration      [14C]-olein absorption : Triolein Breath test