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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What this test measures
Carcinoembryonic antigen (CEA) is a specific protein that functions as a tumor marker. High levels of CEA are normal in healthy, unborn babies. After birth, CEA levels become very low or disappear completely. So, healthy adults should have little or no CEA in their bodies. This glycoprotein has a molecular weight of 200 kDa and is normally derived from fetal embryonic endodermal epithelium, controlled by fetal oncogenes. CEA usually disappears from serum after birth. However, small quantities of CEA may remain in colon tissue.
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. But some types of cancer can increase this protein. But some conditions, including certain types of cancer, can increase your blood CEA levels. If individuals have been diagnosed with a cancer that can cause high CEA levels, CEA testing may help healthcare providers learn more about the cancer and chance of recovery. The test is often used with other tests to check if cancer treatment is working. Healthcare providers primarily use CEA testing for monitoring known cancers rather than for initial cancer screening, as no doctor visit is required to obtain this valuable information.
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 typically measured in nanograms per milliliter (ng/mL). Labs use different methods to measure CEA. The test method can affect results. So, its best to have tests done the same way, and usually in the same lab. This allows healthcare providers to compare results over time. CEA levels should always be interpreted in conjunction with other clinical information and diagnostic tests, as elevated levels can occur in both cancerous and non-cancerous conditions.
| 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
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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