Carbohydrate Antigen 19-9 (C19-9)

CA19-9 is a tumor marker often linked to pancreatic cancer. It helps track how well treatments are working or if the cancer has returned. While high levels can indicate pancreatic or other cancers, they can also result from non-cancerous conditions like pancreatitis or bile duct issues. CA19-9 is not used to diagnose cancer on its own but provides important clues when combined with other tests. Understanding CA19-9 can help guide care decisions for people with pancreatic cancer.