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CEA Test
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

CEA Test

The CEA test measures a tumor marker protein in the blood to help monitor cancer treatment and check for cancer recurrence.

Overview

CEA stands for carcinoembryonic antigen, a protein that acts as a "tumor marker." While high levels are normal in unborn babies, healthy adults should have little to no CEA in their bodies. Elevated levels can be associated with various cancers, including those of the colon, rectum, breast, lung, pancreas, liver, ovary, and thyroid.

What is it used for?

The CEA test is not used to screen for or diagnose cancer, as many non-cancerous conditions can also raise CEA levels. Instead, it is used for patients already diagnosed with cancer to:

  • Understand the severity of the cancer after diagnosis.
  • Predict the likelihood of recovery or cancer recurrence.
  • Monitor how well a cancer treatment is working.

Why do I need a CEA test?

Your provider may order this test at different stages of your care:

  • Before treatment: To establish a baseline measurement and help guide treatment decisions.
  • During treatment: To see if the current therapy is effective.
  • After treatment: To monitor for signs that the cancer has returned.

What happens during the test?

The test is typically performed using a blood sample taken from a vein in your arm. In less common cases, fluid from the chest, abdomen, or spine may be tested. You generally do not need to prepare for a blood test, though you may be asked to stop smoking, as smoking can increase CEA levels.

What do the results mean?

Your provider will compare your current results with past levels to determine the status of your cancer:

  • Decreases in CEA: Often indicate that treatment is working.
  • Increases in CEA: May suggest that treatment is not working or that the cancer has returned.
  • High levels that stay high: May indicate that a tumor was not fully removed or that the cancer is growing.

Because CEA levels can be influenced by other health conditions, your provider will use these results alongside other diagnostic tests to interpret your health status.

Frequently Asked Questions

Do not panic, as a single rise does not always mean the cancer has returned. Your provider will likely order a repeat blood test to confirm the trend. They may also recommend imaging tests, such as a CT scan or MRI, to look for any signs of disease. Always discuss the results with your oncologist to understand the next steps in your care plan.
Not necessarily. While elevated CEA levels can indicate cancer, they can also be raised by non-cancerous conditions such as smoking, inflammation, liver disease, or certain infections. Because of this, the CEA test is not used to screen for or diagnose cancer in healthy individuals. It is primarily used to monitor patients who have already been diagnosed with cancer.
The frequency depends on the type of cancer and your specific treatment plan. Typically, tests are done every three months for the first two years after treatment, then every six months for the next three years, and annually thereafter. Your oncologist will set a specific schedule based on your risk of recurrence.
Yes, smoking can significantly increase CEA levels in the blood. If you are a smoker, your provider will take this into account when interpreting your results. They may recommend you stop smoking before the test if possible, or they will compare your current levels to your previous baseline rather than using a standard "normal" range.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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