Buamah, P K Concentrations of trypsin, elastase and carbohydrate antigen CA 19-9 in serum of cystic fibrosis patients. [electronic resource] - Clinical chemistry May 1986 - 913 p. digital Publication Type: Letter ISSN: 0009-9147 Subjects--Topical Terms: Antigens, Neoplasm--bloodAntigens, Tumor-Associated, CarbohydrateCystic Fibrosis--bloodHumansPancreatic Elastase--bloodTrypsin--blood