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HelpTEST ID CA153 Cancer Antigen 15-3 (CA 15-3), Serum
Reporting Name
Cancer Ag 15-3, (CA 15-3), SSpecimen Type
SerumSpecimen Required
Patient Preparation: For 12 hours before specimen collection, patient should not take multivitamins or dietary supplements (eg, hair, skin, and nail supplements) containing biotin (vitamin B7).
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Specimen Minimum Volume
0.75 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Refrigerated (preferred) | 7 days |
| Frozen | 90 days |
Method Name
Electrochemiluminescence Immunoassay (ECLIA)
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
Reference Values
Males: <30 U/mL (use not defined)
Females: <30 U/mL
Day(s) Performed
Monday through Saturday
Report Available
1 to 3 daysSpecimen Retention Time
2 weeksPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
86300
Forms
If not ordering electronically, complete, print, and send an Oncology Test Request (T729) with the specimen.
Useful For
Managing breast cancer patients when used in conjunction with clinical information and other diagnostic procedures
Serial testing to assist in early detection of disease recurrence in previously treated stage II and III breast cancer patients
Monitoring response to therapy in metastatic breast cancer patients
This test is not useful as a cancer screening test.
Clinical Information
Carcinoma of the breast is the most prevalent form of cancer in women. These tumors often produce mucinous antigens, which are large molecular weight glycoproteins with O-linked oligosaccharide chains. Tumor-associated antigens encoded by the human MUC-1 gene are known by several names, including MAM6, milk mucin antigen, cancer antigen (CA) 27.29, and CA 15-3.
CA 15-3 assay values are not elevated in most normal individuals and are frequently elevated in sera from breast cancer patients.
Nonmammary malignancies in which elevated CA 15-3 assay values have been reported include: lung, colon, pancreas, primary liver, ovary, cervix, and endometrium.