Cancer Antigen (CA) 15-3
Fasting Required: No

Lab: Quest Diagnostics

Specimen: Blood

Results: Test run Tues, Fri; Report available in 5 business days

Note: Result turnaround times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.

Limitations: Benign diseases of the breast and liver may cause elevated results.

Description: CA 15-3 is a blood test used to monitor response to breast cancer treatment and disease recurrence. Elevated levels may also be seen in lung, ovarian, endometrial, bladder, gastrointestinal cancers, as well as liver disease (cirrhosis, hepatitis), lupus, sarcoid, tuberculosis, and non-cancerous breast lesions.

CA 15-3 may be useful for monitoring patients with metastatic breast cancer and certain ovarian cancers. The CA 15-3 values from sequential samples have a high correlation with the clinical course in most patients with metastatic breast cancer.

Alternative Name(s): Cancer Antigen 15-3