CA 19-9 assay. Definition

Medical Definition: CA 19-9 assay

A test that measures the concentration of CA 19-9 in the blood. CA 19-9 is a tumor marker that both cancer cells and normal cells released into the bloodstream. Amounts of CA 19-9 in the blood, higher than normal may be a sign of gallbladder cancer, pancreatic cancer or other conditions.

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