CA-19.9 Blood Test

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Use: CA 19.9 is a tumor marker used especially for pancreatic cancer but also useful in diagnosing hepatic, oesophageal and colorectal cancers. The measured CA 19-9 value of a patient's sample can vary depending on the testing procedure used. CA 19-9 values determined on patient samples by different testing procedures cannot be directly compared with one another and could be the cause of erroneous medical interpretations. The determination of CA 19-9 cannot be used for the early detection of pancreatic carcinoma.1 Three percent to 7% of the population have the Lewis a-negative/b-negative blood group configuration and are unable to express the mucin with the reactive determinant CA 19-9. Patients known to be genotypically negative for Lewis blood group antigens will be unable to produce the CA 19-9 antigen even in the presence of malignant tissue. Phenotyping for the presence of the Lewis