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HelpTest Code CA25 Cancer Antigen 125 (CA 125), Serum
Reporting Name
Cancer Ag 125 (CA 125), SUseful For
Evaluating individuals' response to ovarian cancer therapy
Predicting recurrent ovarian cancer
This test is not useful for cancer detection screening in the normal population.
Method Name
Electrochemiluminescent Immunoassay (ECLIA)
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
SerumSpecimen Required
Patient Preparation: For 12 hours before specimen collection do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins.
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 plastic vial.
Specimen Minimum Volume
0.75 mL
Reject Due To
| Gross hemolysis | OK |
| Gross lipemia | OK |
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 5 days | |
| Frozen | 168 days |
Reference Values
Males: Not applicable
Females: <46 U/mL
Day(s) Performed
Monday through Friday
CPT Code Information
86304
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CA25 | Cancer Ag 125 (CA 125), S | 83082-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| CA25 | Cancer Ag 125 (CA 125), S | 83082-8 |
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.Report Available
1 to 3 daysForms
If not ordering electronically, complete, print, and send an Oncology Test Request (T729) with the specimen.