CEA (carcinoembryonic antigen) blood test
Quick answer: A CEA test measures a protein that can be raised in bowel and some other cancers, and also in smokers and some non-cancer conditions. Doctors use it mainly to follow bowel cancer treatment and check for recurrence, not to screen healthy people.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
How the test is done
- 1You sit and a band is placed around your arm
- 2A needle draws blood from a vein
- 3The lab measures CEA
- 4Results are often compared with earlier ones to see a trend
What your results can mean
Reading your report
A raised level does not confirm cancer on its own, so discuss your result with your doctor.
If the result is outside the usual range
A high level can be seen with bowel cancer and some other cancers, and also with smoking, inflammatory bowel disease, liver disease and lung infections. A rising level after treatment can lead to scans to check for recurrence.
Who usually has this test
People with bowel cancer before and after treatment, and sometimes people with other cancers that make CEA.
Risks and aftercare
The only usual effect is a small bruise at the needle site.
Names and options
Also called: CEA, carcinoembryonic antigen
Listed by the hospital as
- CEA, SERUM
Questions about this test
Can smoking raise CEA?
Yes. Smokers often have higher CEA than non-smokers. Tell your doctor if you smoke, as it helps them read the result.
Why is CEA checked before bowel cancer surgery?
A level before surgery gives a starting point. If it falls after surgery and later rises, it can be an early sign that cancer has returned.
Is CEA used to screen for bowel cancer?
No. Screening uses stool tests or colonoscopy. CEA is mainly used to monitor people already diagnosed.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
Reception
Waiting area
IVF lab
This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.