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CEA Test Test

The CEA test measures the level of carcinoembryonic antigen (CEA) in your blood. It is a tumor marker that can help monitor certain cancers, especially colorectal cancer, but it is not used to screen for or diagnose cancer.

What this test measures

CEA stands for carcinoembryonic antigen. CEA is a protein that is a type of "tumor marker." Tumor markers are substances that are often made by cancer cells or by normal cells in response to cancer.

What your results mean

Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.

Higher-than-normal results

A high level of CEA may mean you have a larger tumor and/or your cancer has spread. You'll need other tests to confirm how serious your cancer is.

Lower-than-normal results

A low level of CEA may mean your tumor is small and the cancer has not spread to other parts of your body. But some cancers don't make much CEA, so your provider may use other tests to learn more.

Frequently asked questions

What does CEA stand for?

CEA stands for carcinoembryonic antigen.

Is the CEA test used to diagnose cancer?

No, CEA tests are not used to screen for or diagnose cancer. They are mostly used in people who have already been diagnosed with certain cancers.

What cancers can cause high CEA levels?

Cancers that may cause high CEA levels include cancers of the colon and rectum, prostate, ovary, lung, thyroid, liver, pancreas, and breast.

What does a decrease in CEA during treatment mean?

Decreases in CEA over time often mean that treatment is working.

Can non-cancer conditions raise CEA levels?

Yes, many other health problems that aren't cancer can make CEA levels rise, including certain conditions that affect your liver, digestion, or breathing.

Related lab tests

Sources

Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.