Breast C Antigen CA15-3

Breast C Antigen CA15-3


The Breast Cancer Antigen CA 15-3 test measures the level of CA 15-3 protein in your blood. Elevated levels may be associated with breast cancer, particularly in advanced or metastatic cases, and the test is often used to monitor response to treatment. It may also help detect possible recurrence after treatment. This test is usually interpreted alongside scans, clinical examination, and other investigations, as it is not suitable as a standalone screening test.

Parameters Covered

Breast C Antigen CA15-3

What the Test Measures

This test measures the amount of CA 15-3 protein in your bloodstream. Higher-than-normal levels can sometimes indicate breast cancer activity, but levels may also rise in certain non-cancerous conditions. Your healthcare professional will interpret the results in the context of your medical history and other test findings.

Turnaround Time for Results


Leicester: Most results are available within 1–2 working days (some tests may take longer)
Outside Leicester: Results are typically available within 2–4 working days (some tests may take longer)
Certain parameters: Some specialised tests may take 2–3 weeks to process.

How Results Are Delivered

Your personalised report will be securely sent to your registered email address.