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Carcinoembryonic Antigen (CEA) - Serum Mass Concentration

Published: August 9, 2026Updated: August 17, 2026

This test measures the level of carcinoembryonic antigen, a protein that may be produced by certain types of cancer and some non-cancerous conditions.

Quick summary

["CEA levels can help monitor cancer progression or response to treatment."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
68928-1
Short code
CK 19 CSF-mCnc
Synonyms
CK 19 CSF-mCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Ref low
22
Ref high
198
Critical range
— – 10000 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82553
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What Is Carcinoembryonic Antigen (CEA)?

Carcinoembryonic antigen (CEA) is a protein found in small amounts in the blood of most people. It is produced by certain types of cancer cells, particularly those of the colon, rectum, pancreas, and breast. In some cases, it may also be elevated in non-cancerous conditions like chronic inflammation or smoking.

Why Might You Need This Test?

Doctors may order a CEA test to check for signs of cancer, especially if you have a history of cancer or symptoms like unexplained weight loss, fatigue, or abdominal pain. It can also be used to monitor cancer progression or treatment effectiveness in people who have already been diagnosed with cancer.

Sample Collection and Preparation

A blood sample is drawn from a vein, usually in your arm. The blood is then sent to a lab for testing. You may be asked to fast for a few hours before the test, but this is not always required.

What to Expect During the Test

The blood draw is quick and typically painless. You may feel a slight pinch or sting when the needle goes in and out. Afterward, you can usually resume normal activities immediately.

Reference range

Adult males: 22-198 U/L; Females: 22-198 U/LN/A

Specimen: csf

No special preparation required. Inform provider of any chest pain or symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated CEA levels can indicate the presence of certain cancers, such as colorectal, pancreatic, or breast cancer. However, CEA levels can also be elevated in people without cancer due to factors like chronic lung disease, smoking, or liver disease. CEA levels alone are not enough to diagnose cancer; they are usually used alongside other tests and imaging.

Short name

CEA Blood Test

Frequently asked questions

How often should I get this test?
The frequency of CEA testing depends on your medical history and treatment plan. If you have cancer, your doctor may recommend regular monitoring to track changes in your CEA levels. If you have no cancer diagnosis, this test is less commonly used for routine screening unless there are specific symptoms or risk factors.
What do my CEA test results mean?
Your doctor will interpret your CEA test results in the context of your overall health, medical history, and symptoms. Elevated levels may prompt further testing or evaluation, while normal levels do not rule out cancer. Follow-up testing and discussions with your healthcare provider are essential for accurate interpretation.
Can lifestyle changes affect CEA levels?
Yes, lifestyle factors such as smoking, chronic lung disease, and certain medications can influence CEA levels. If you have risk factors or symptoms, it’s important to discuss these with your doctor to understand how they may impact your test results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy