CA 19-9 (Cancer)


A large percentage of patients with gastrointestinal tumors (such as pancreatic, liver, gastric, colorectal tumors) and some other malignancies have been shown to have elevated serum  CA 19-9 levels. Serum CA 19-9 levels may be useful for monitoring disease activity or predicting relapse following treatment. CA 19-9 should not be used as a screening test.

CA 19-9 (Cancer)


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  • Fasting Required: NO
  • Preferred Specimen: Serum
  • Reference Range(s): 34 U/mL
  • Limitations: CA 19-9 is absent in individuals with blood group Lewis Le(a-b-), as observed in approximately 5% of Caucasian and 20-25% of African American patients. CA 19-9 levels, regardless of value, should not be interpreted as absolute evidence of the presence or absence of disease, more testing may be needed.
  • Turnaround Time: 3 Day
  • Test Code: 4698