CEA (Carcinoembryonic Antigen)
A tumor marker test that measures CEA protein levels to help monitor certain cancers and evaluate treatment response, particularly for colorectal and other gastrointestinal cancers.
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LevelPanel has no business or affiliate relationship with Quest or LabCorp. These links are provided as a public service.
Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
What this test measures
Carcinoembryonic antigen (CEA) is a protein normally produced in large quantities during fetal development but present only at very low levels in healthy adults. It belongs to a class of substances called tumor markers, proteins that certain cancers produce in elevated amounts or that the body generates in response to cancer. Several types of cancer, particularly colorectal cancer, can cause CEA levels to rise, though cancers of the pancreas, lung, breast, stomach, and ovary may also produce elevated readings.
Healthcare providers primarily use CEA for monitoring known cancers rather than for initial screening or diagnosis, because non-cancerous conditions (including smoking, inflammatory bowel disease, pancreatitis, cirrhosis, and certain infections) can also elevate CEA. The test is most valuable for tracking treatment response: declining CEA during chemotherapy or after surgery suggests the treatment is working, while rising levels may signal disease recurrence. Serial measurements over time, using the same testing method and laboratory, are more informative than a single reading.
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals diagnosed with colorectal, pancreatic, liver, stomach, breast, lung, ovarian, or thyroid cancer who need ongoing monitoring
- Patients undergoing cancer treatment who require evaluation of therapy effectiveness
- Those with a history of cancer looking to monitor for potential recurrence after treatment completion
- Individuals with unexplained symptoms who have been advised by their healthcare provider to check tumor marker levels
- People with family history of certain cancers seeking additional monitoring tools in consultation with healthcare providers
What to expect
Preparation
No fasting is required with a CEA blood test, which means there's no preparation needed on the patient's part. Smoking may increase the CEA level. If individuals smoke, their healthcare provider may tell them to avoid doing so for a short time before the test. For 12 hours before specimen collection, patients should not take multivitamins or dietary supplements (eg, hair, skin, and nail supplements) containing biotin (vitamin B7). Individuals should inform their healthcare provider about all medications and supplements they are taking.
Sample Type
CEA is usually measured with a blood sample. During a CEA blood test, a health care professional will take a blood sample from a vein in the arm, using a small needle.
Collection
Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the back of the hand. A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. Individuals may feel a little sting when the needle goes in or out. This usually takes less than five minutes.
Turnaround
Results are typically available within 1-3 business days. The laboratory will send results directly to individuals, maintaining complete confidentiality without involving personal physicians or insurance companies.
Understanding your results
CEA is reported in nanograms per milliliter (ng/mL). Because different laboratories may use different analytical methods, it is important that serial measurements are performed at the same facility for consistent comparison. A single elevated CEA result does not confirm cancer, and a normal result does not rule it out. Healthcare providers evaluate CEA trends over time alongside imaging, pathology findings, and other diagnostic information to monitor disease activity. The clinical significance of any given CEA level depends heavily on the individual's cancer type, treatment status, and baseline values established prior to or during treatment.
| Population | Reference Range | Notes |
|---|---|---|
| Non-smokers | 0-3.0 ng/mL | Most healthy non-smoking adults have CEA levels in this range |
| Smokers | 0-5.0 ng/mL | Slightly higher values may be considered normal for individuals who smoke |
Reference ranges shown are general guidelines. Your lab report will include the specific reference range used by the laboratory that processed your sample, which is the authoritative range for interpreting your results.
What does a “Low” result mean?
A low level of CEA may mean the tumor is small and the cancer has not spread to other parts of the body. After birth, CEA levels become very low or disappear completely. So, healthy adults should have little or no CEA in their bodies. Low or normal CEA levels are typically reassuring and suggest either the absence of CEA-producing conditions or effective treatment response in individuals with a known cancer history. However, some cancers don't make much CEA, so healthcare providers may use other tests to learn more about how much cancer individuals have and if it's spread. Normal CEA levels do not completely rule out the presence of cancer, as not all cancers produce elevated CEA.
What does a “High” result mean?
Slightly elevated CEA levels: CEA levels greater than 3 ng/mL but less than 10 ng/mL typically suggest a small (localized) tumor and a low likelihood of cancer recurrence. Slightly elevated CEA levels could also be due to health conditions that aren't cancer. Anything greater than 10 ng/mL suggests extensive disease, and levels greater than 20 ng/mL suggest the cancer may be spreading. Several non-neoplastic conditions, i.e., acute and chronic inflammations, benign tumors, renal or hepatic insufficiency, are associated with elevated plasma levels of Carcinoembryonic Antigen (CEA). Usually, CEA elevation in these pathologies is less than 10 ng/ml. The CEA blood level may be increased in non-cancerous conditions including: an inflammation such as pancreatitis (inflammation of the pancreas) or cholecystitis (inflammation of the gallbladder) Smokers who do not have cancer can also have an increased CEA value. Additional non-cancerous causes may include inflammatory bowel disease, liver disease, lung disease, and chronic kidney disease.
Privacy & confidentiality
All test orders are authorized and results reviewed by an independent, board-certified physician who is not the patient's personal doctor. When individuals choose LevelPanel for CEA testing, their health information remains completely confidential and private. Test results are <u>not reported to personal doctors</u> or healthcare providers unless specifically requested by the individual. Results are <u>not part of medical records</u> maintained by healthcare systems or physicians' offices. Additionally, CEA testing through LevelPanel will <u>not appear on insurance explanation of benefits statements</u> since no insurance claims are filed. This testing approach ensures complete discretion for individuals who prefer to monitor their health privately or seek additional information beyond routine medical care. Personal health data is protected with industry-standard security measures, and results are only accessible through secure patient portals. Individuals maintain full control over who receives their health information and can choose to share results with healthcare providers at their discretion. This privacy-focused approach allows for proactive health monitoring without unwanted involvement from insurance companies, employers, or unsolicited medical advice.
Frequently asked questions
Related tests
Last reviewed: April 2026
CPT Code: 82378
This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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LevelPanel has no business or affiliate relationship with Quest or LabCorp. These links are provided as a public service.
Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
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