CEA (Carcinoembryonic Antigen)
A tumour marker used primarily to monitor known colorectal and some other cancers — not to screen healthy people for them.
Included with an important caveat: tumour markers are poor screening tests in asymptomatic people. They produce false positives that cause real anxiety and unnecessary imaging, and false negatives that create false reassurance.
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Order directly through Marek Diagnostics — no doctor's visit needed, drawn at any Quest location in the US. Code CAMERON applies 10% off automatically.
Order this test — 10% off → Browse all 102 markers →What CEA (Carcinoembryonic Antigen) is usually tested alongside
On its own, one marker is a data point. These panels include CEA (Carcinoembryonic Antigen) plus the markers that make it interpretable — each names every test, why it is on the list, and loads the whole set into your cart in one click at 10% off.
includes this + 12 more markers — Healthy, asymptomatic, and want the most informative baseline you can get — the panel to run once a year and track for decades.
includes this + 6 more markers · built for men — Never had proper bloodwork, or want the highest-value snapshot for the least money.
includes this + 6 more markers · built for women — Never had proper bloodwork, or want the highest-value snapshot for the least money.
Why your CEA (Carcinoembryonic Antigen) might be wrong
Most abnormal results are interference, not disease. These are the things that measurably move this specific marker — check them before you change anything. Each one says whether the number is wrong and should be repeated, badly timed and should be redrawn, or real with a cause worth explaining.
Raises CEA substantially in the absence of any cancer — one of the most common causes of a mildly raised result.
Note smoking status; it is usually the explanation.
Inflammatory bowel disease, liver disease and pancreatitis all raise CEA without any malignancy.
A mildly raised CEA in someone with known bowel or liver disease is usually that.
What CEA (Carcinoembryonic Antigen) means in combination
A single marker tells you a little. Combinations tell you the story — these are the named patterns this marker takes part in, and what each one points at.
Tumour markers are monitoring tools, not screening tests, and every one of them rises in benign conditions. CA-125 with endometriosis, fibroids or any peritoneal irritation. CEA with smoking. CA 19-9 with gallstones and any biliary obstruction. Calcitonin with chronic PPI use and kidney impairment.
Interpret only in context, and never as a screen. The trend across serial measurements matters far more than one value.
What to test next
Markers rarely answer alone. These are the ones that put CEA (Carcinoembryonic Antigen) in context — each with its own full breakdown.
Frequently asked questions
<3.0 ng/mL non-smokers; <5.0 ng/mL smokers Ranges vary by laboratory and assay — always compare to the range printed on your own report.
Optimal ranges, root causes and the full correction protocol are available inside Coach Cam's Peptide Academy.
See the full breakdown inside the Academy.
See the full breakdown inside the Academy.
You can order CEA (Carcinoembryonic Antigen) directly through Marek Diagnostics without a doctor's visit — drawn at any Quest Diagnostics location in the US. Code CAMERON applies 10% off automatically.