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| Title | CA 15-3 (CANCER ANTIGEN 15-3) |
| Specimen Requirement | <p>1 SST/2.0 mL serum. After 30 minutes of clotting, promptly centrifuge and refrigerate.</p>
<p>Frozen serum if testing cannot be performed within 24 hours.</p> |
| Methodology | |
| Stability | Refrigerated 24 hours; Frozen 7 days |
| Reference Range | By Report* |
| Turnaround | 24 Hours |
| Clinical Use | <p>Elevated serum CA 15-3 concentrations are found in 5% of stage I, 29% of stage II, 32% of stage III and 95% of stage IV carcinoma of the breast. Most (96%) patients with a CA 15-3 increase of greater than 25% have disease progression. Most (nearly 100%) patients with a CA 15-3 decrease of greater than 50% are responding to treatment.</p> |
| Test Code | CA15M |
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