Cancer Antigen 19-9 (CA 19-9) Antigen

Sourced from the Antigens category catalog of Antibodies.com, this native Cancer Antigen 19-9 (CA 19-9) preparation is supplied as a liquid in a 10 kU pack size, intended for use as an immunogen, calibrator, or assay control in immunoassay development targeting the carbohydrate CA 19-9 epitope (sialyl Lewis a). The product is listed under the Antibodies.com Antigens range and is presented as a research-use reagent for work involving gastrointestinal and pancreatic tumor markers. As with other native cancer antigen preparations in the same category, it is typically provided in a phosphate-buffered liquid matrix suitable for direct incorporation into ELISA, chemiluminescent immunoassay, and lateral flow workflows that quantify or detect the CA 19-9 carbohydrate antigen expressed on mucin glycoproteins. The antigen reacts with anti-CA 19-9 monoclonal antibodies used in established diagnostic immunoassays, including the CA 19-9/1390R clone referenced elsewhere in the Antibodies.com catalogue. Being a native human tumor-associated antigen, it is compatible with downstream applications such as preparation of calibration curves, spike-and-recovery experiments, and as a positive control on Western blot, immunohistochemistry, and immunofluorescence platforms. The 10 kU liquid format offered through Antibodies.com allows straightforward dilution into assay buffer without resolubilization, and the product is intended for research use only and not for diagnostic or therapeutic applications.