CEA Test
A blood test for carcinoembryonic antigen, mainly used to monitor bowel cancer.
Quick Summary
To monitor bowel and some other cancers during and after treatment.
CEA level.
No preparation needed.
Overview
CEA isn't used for screening.
Smoking can slightly raise CEA.
What It Measures
CEA
Blood level.
How It's Performed
- 01
Preparation
Usually no special preparation. Tell the staff about medicines you take.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm with a thin needle.
- 03
Afterwards
Press on the spot for a minute. A small bruise is common; you can go back to normal activities.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| CEA (non-smokers) | Below 3 | ng/mL |
Interpreting Results & Next Steps
Discuss with Doctor
Normal ranges differ between laboratories, ages and sexes; always use the range printed on your report and ask your doctor what your results mean.
If values are High:
A rising CEA after treatment may suggest cancer returning and needs review.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- CEA Test(opens in a new tab) · MedlinePlus, US National Library of Medicine