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HelpTest Code CA19 CA 19-9
Specimen Required
Specimen Type: Serum
Collection Container/Type
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Specimen Minimum Volume
0.5 mL
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Reference Range
<34 U/mL
This test was performed using the Siemens chemiluminescent method. Values obtained from different assay methods cannot be used interchangeably. CA 19-9 levels, regardless of value, should not be interpreted as absolute evidence of the presence or absence of disease.
Day(s) and Time(s) Performed
Tues-Sat
Report Available
1-2 days
Clinical Significance
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.
Method Name
Immunoassay (IA)
CPT Code(s)
86301
Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153
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.
Aliases
Cancer Antigen 19-9,Carbohydrate Antigen 19-9