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Macmillan and Cancerbackup merged in 2008. Together we provide free, high quality information for people affected by cancer through our publications, website and phone service. Find out more|.
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It isn't possible to give an exact number for this. The figure may differ from one laboratory to another depending on how each laboratory carries out the test. A person's age, sex and whether they are a smoker can also affect what the normal levels for CEA are for them.
Your doctor will be able to tell you what the normal levels for CEA are in the laboratory they use. This should help you to understand your test results better.
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If you have any questions about cancer, need support or just want someone to talk to, ask Macmillan.
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