Cancer Antigen 15-3 (Breast Cancer Marker)
CA 15-3 is considered a tumor marker because high levels of the antigen may indicate certain cancers, including breast cancer. CA 15-3 tests aren’t used to diagnose cancer, but rather to assess how cancer is responding to treatment. CA 15-3 fluctuations help cancer doctors determine whether a tumor is stable, growing, shrinking or has recurred.
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CA 15-3 is a tumor marker test mainly used to monitor breast cancer progression or response to treatment. It measures the amount of cancer antigen 15-3, a protein released into the blood by breast cancer cells.
Risk Assessment / Purpose:
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Helps in monitoring breast cancer treatment effectiveness.
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Detects recurrence or metastasis of breast cancer.
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Sometimes used to support diagnosis of other cancers (e.g., ovarian, lung, or pancreatic) though less specific.
Normal Range:
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Typically < 30 U/mL (may vary slightly by lab).
Interpretation:
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High CA 15-3 levels may indicate:
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Advanced or metastatic breast cancer
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Other cancers (lung, ovarian, pancreatic, liver)
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Non-cancerous conditions (liver disease, benign breast disorders, endometriosis)
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Normal or low levels do not rule out early-stage cancer, as CA 15-3 may remain normal initially.
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Changes over time are more important than a single result.
Sample Type:
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Venous blood sample (serum)
Frequently Asked Question
CA 15-3/Cancer Antigen (CA -15-3)
Cancer Antigen 15-3 (Breast Cancer Marker)
CA 15-3 is considered a tumor marker because high levels of the antigen may indicate certain cancers, including breast cancer. CA 15-3 tests aren’t used to diagnose cancer, but rather to assess how cancer is responding to treatment. CA 15-3 fluctuations help cancer doctors determine whether a tumor is stable, growing, shrinking or has recurred.
Covid Safety
Assured
Free Report
Counselling