Individual test · Labcorp 002261

Carbohydrate Antigen (CA) 19-9

This test measures the level of CA 19-9, a protein often released into the blood by tumor cells in the pancreas, gallbladder, or liver. It is primarily used to monitor patients who have been diagnosed with cancer to determine if treatment is working or if the disease has returned. While high levels can indicate tumor activity, this test cannot diagnose cancer on its own or be used for general screening. Additionally, certain non-cancerous conditions, such as bile duct blockages, can cause elevated results.