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Individual tumour markers for cancer screening.
The Breast Cancer Marker Test (CA 15-3) is a specialised blood screening that measures the level of Cancer Antigen 15-3, a protein often elevated in individuals with breast cancer. This tumor marker is primarily used to monitor treatment response and detect recurrence in patients with a known history of breast cancer, rather than as a primary diagnostic tool. CA 15-3 levels can provide valuable information about disease progression, treatment effectiveness, and potential cancer recurrence. While elevated levels may indicate breast cancer activity, they can also be found in other conditions, making this test most useful when interpreted alongside other clinical findings and imaging studies.
Venous blood sample drawn
No fasting required
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CA 15-3 is a tumour marker mainly used to help monitor people who have already been diagnosed with breast cancer. It is not a breast cancer screening test, and it does not replace NHS breast screening or a check of any breast change by your GP.
The level of cancer antigen 15-3 (CA 15-3) in your blood. This CA 15-3 blood test reports this one marker.
Noticed a breast lump or change? Contact your GP promptly. A blood test is not the right first step.
No. It is mainly used to help monitor people who have already been diagnosed. Keep attending NHS breast screening when invited.
No. A normal result does not rule out breast cancer, and a raised result can have other causes.
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Share it with the specialist or care team who follows your results. They will interpret it alongside your history, any treatment and any scan results.
Related single marker tests: CA 125 blood test · CEA blood test
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