A normal CEA (carcinoembryonic antigen) level is generally considered to be between 0 and 2.9 ng/mL (nanograms per milliliter) of blood.
Here's a more detailed breakdown:
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What is CEA? CEA is a protein that's often found in higher amounts in the blood of people with certain types of cancer. It is most often associated with colorectal cancer, but can be elevated in other cancers as well as some non-cancerous conditions.
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Normal Range: The typical reference range for CEA is 0-2.9 ng/mL. However, it's important to note that reference ranges can vary slightly depending on the laboratory performing the test.
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Why is CEA measured? CEA levels are primarily used to:
- Monitor treatment response: To see if cancer treatment is working.
- Detect recurrence: To check for the return of cancer after treatment.
- As a baseline marker: In some cases, to establish a baseline CEA level before treatment begins.
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Elevated CEA Levels: While a normal CEA level is below 2.9 ng/mL, higher levels can indicate:
- Cancer: Colorectal cancer is the most common association, but other cancers like lung, breast, pancreatic, stomach, and ovarian cancer can also cause elevated CEA.
- Non-cancerous conditions: Certain benign conditions such as smoking, inflammation, liver disease, and inflammatory bowel disease can also lead to elevated CEA levels.
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Important Considerations:
- A slightly elevated CEA level doesn't always mean cancer.
- CEA levels should be interpreted in the context of a person's overall health, medical history, and other test results.
- CEA is not a perfect screening tool for cancer as many cancers do not produce high levels of CEA.
In summary, while the "normal" CEA level is typically between 0 and 2.9 ng/mL, it's crucial to discuss your specific results with your healthcare provider for accurate interpretation and appropriate management.
