CA 15‑3 (Cancer Antigen 15‑3)
Use
CA 15‑3 is a tumor marker assay used primarily to monitor disease progression or therapeutic response in patients with metastatic breast cancer, to assist in early detection of recurrence when used alongside clinical information and other diagnostic methods. It is not intended as a screening test for early-stage breast cancer.
Special Instructions
Not provided.
Limitations
Interference may occur in rare cases due to human anti‑mouse antibodies (HAMA), streptavidin or ruthenium antibodies. Caution is advised if results do not align with clinical presentation.
Methodology
Immunoassay
Biomarkers
Result Turnaround Time
3-4 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
2 mL serum (Test volume required: 1 mL; minimum 0.5 mL)
Minimum Volume
0.5 mL
Container
Red Top (no additive) or serum separator tube (SST)
Causes for Rejection
Gross hemolysis; gross lipemia; plasma samples
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 7 days |
| Refrigerated | 7 days |
| Frozen | 28 days |
Other tests from different labs that may be relevant