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CA 15-3 (CA15-3)


A tumour marker test which is used to monitor the progression or recurrence of breast cancer.

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check_circle1 test included
schedule1 working day turnaround   info
invert_colors Blood - finger-prick or venous    info
Special Instructions
Contact Medichecks prior to ordering this test online.

CA 15-3 (CA15-3)

About this test

This test is not recommended as a screening test but rather as a test to monitor an already diagnosed cancer or a recurrence of cancer following treatment. Its use as a screening test is not established. False positives and false negatives may cause undue anxiety or unwarranted reassurance. If you wish to take this test as a screening test please be aware of its limitations. 

How it works

Collect Sample

We send you an easy-to-use kit to collect your blood sample.

Post Sample

Post your sample to our lab in the prepaid envelope provided.

View Results

View results securely in your own personal dashboard.

Important Information

This test contains a tumour marker test. Please see your doctor if you are suffering any unusual symptoms which persist - do not use these tests to self-diagnose. Tumour markers are most useful when viewed in conjunction with a clinical examination. Results do not constitute a diagnosis of cancer and markers are often tested to monitor treatment when cancer has already been diagnosed, or to check that it has not returned. Cancer markers can be elevated in benign conditions and results often produce false positives. Sometimes tumour markers can be normal even though cancer is present. Please make sure that you think carefully about the risks and benefits before taking this test.

Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.

Tests Included

Tumour Markers

CA15-3 is a protein which is produced by a variety of cells, particularly breast cancer cells. It is primarily used as a marker to see how a patient is responding to breast cancer treatment or in monitoring for recurrence of the disease.

Raised levels can be seen in non cancerous conditions, such as pregnancy, endometriosis and liver damage, as well as in other cancers such as stomach, ovarian, pancreas and lung. 

Finger-prick blood sample collection kit

We will send you your CA 15-3 (CA15-3) finger-prick blood test sample collection kit which contains everything you need to take your blood sample in the comfort of your own home. If you are unsure about completing a finger-prick blood sample collection you will have the opportunity to select a clinic-based venous blood sample collection or choose to go our London laboratory during the checkout process.

How to collect a finger-prick blood sample

Postage & packaging

Your CA 15-3 (CA15-3) test includes 1st class postage and packaging for you to send your blood sample directly to our laboratory for analysis. If you live in an area where you cannot rely on the post or you simply want to ensure that your sample arrives at the laboratory the following day, you may wish to send your blood sample guaranteed next day delivery for extra reassurance.

Private laboratory analysis

Your blood sample will be analysed at one of our chosen laboratories. You can be assured of fast, accurate results from one of our accredited independent providers of clinical diagnostic tests.

Interpretation of results

Our medical team will comment on out-of-range blood test results and give you follow-up advice where necessary. If you need it, a PDF copy of your CA 15-3 (CA15-3) test results can be downloaded for your doctor.

Secure online account with

Once you have placed your order you will receive login details to where you can manage your account, track your orders and view your CA 15-3 (CA15-3) test results.

Health and Lifestyle tracker

Stay motivated by filling in your online health and lifestyle questionnaire and seeing how improvements in your lifestyle can influence your test results. Your medical and family history gives us vital information when interpreting your results.

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