CA 19-9 is a tumor marker used in the diagnosis, assessment of patient response to treatment, and monitoring of patients with pancreatic or hepatobiliary cancer. In the diagnosis of pancreatic cancer, the presence of symptoms of pancreatic or biliary obstruction and elevated CA 19-9 will help the physician conclude the risk of pancreatic cancer rather than a benign pancreatic tumor.

CA 19-9 is a tumor marker used in the diagnosis, treatment evaluation, and monitoring of patients with cancer. Quantifying CA 19-9 (carbohydrate antigen 19-9) blood is a special test, supporting the diagnosis of cancer, especially pancreatic cancer.