The CA 15.3 test measures the level of Cancer Antigen 15.3 (CA 15.3) in the blood. CA 15.3 is a protein that is often elevated in individuals with breast cancer, particularly in advanced stages. It is used as a tumor marker to monitor and manage breast cancer.
Purpose of the Test:
•Monitor breast cancer progression: Helps track the growth or spread of breast cancer over time.
•Evaluate treatment effectiveness: Determines if chemotherapy, radiotherapy, or other treatments are working.
•Detect recurrence: Elevated CA 15.3 levels after treatment may indicate cancer recurrence.
•Support diagnosis: Occasionally used alongside other diagnostic tests to confirm breast cancer, though not as a primary diagnostic tool.
Conditions That May Elevate CA 15.3:
•Breast cancer (primary association)
•Other cancers, such as lung, ovarian, or liver cancer
•Non-cancerous conditions, including liver disease, benign breast conditions, or pregnancy
Key Notes:
•CA 15.3 is more commonly used for monitoring breast cancer than for diagnosing it.
•Elevated levels alone cannot confirm breast cancer, as they may occur in other conditions.
•This test is typically combined with imaging studies and other biomarkers for a comprehensive evaluation.
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