Carbohydrate Antigen (CA) 19-9
Also known as: CA 19-9
Use
Monitor gastrointestinal, pancreatic, liver, and colorectal malignancies
Special Instructions
Not provided.
Limitations
CA 19-9 values can vary between testing procedures. Different CA 19-9 testing procedures are not directly comparable and could lead to erroneous interpretations. The test is not suitable for early detection of pancreatic carcinoma. It may produce elevated CA 19-9 levels in individuals with cholestasis due to liver excretion pathways. Patients with a Lewis a-negative/b-negative blood group cannot express the CA 19-9 antigen. Some patients may have varying CA 19-9 levels due to gene dosage effects. False findings can result from antibody interference, particularly in patients exposed to monoclonal mouse antibodies.
Methodology
Immunoassay (ECLIA)
Biomarkers
CA 19-9
Analyte
LOINC Codes
- 24108-3 - Cancer Ag19-9 SerPl-aCnc
- 24108-3 - Cancer Ag19-9 SerPl-aCnc
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
1 mL
Minimum Volume
0.7 mL
Container
Gel-barrier tube (preferred) or red-top tube
Collection Instructions
If a red-top tube is used, transfer separated serum to a plastic transport tube.
Storage Instructions
Room temperature
Causes for Rejection
Citrate plasma specimen; improper labeling
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 14 days |
| Refrigerated | 14 days |
| Frozen | 14 days |
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