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The CA 19-9 ELISA test system is an enzyme-linked immunosorbent assay (ELISA) for the quantitative determination of the Cancer Antigen CA 19-9 concentration in human serum. A group of mucin type glycoprotein Sialosyl Lewis Antigens (SLA), such as CA19-9 and CA19-5, have come to be recognized as circulating cancer associated antigens for gastrointestinal cancer. CA19-9 represents the most important and basic carbohydrate tumor marker. The immunohistologic distribution of CA19-9 in tissues is consistent with the quantitative determination of higher CA19-9 concentrations in cancer than in normal
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