A positive CEA blood test indicates an elevated level of the carcinoembryonic antigen (CEA) in the blood. This level is considered abnormal, particularly in adults.
Understanding the Carcinoembryonic Antigen (CEA)
The carcinoembryonic antigen (CEA) is a protein that serves a specific purpose early in life. Based on the provided information:
- CEA is normally found in the tissue of a developing baby while still in the womb.
- After birth, the blood level of this protein disappears or becomes very low.
- In adults, significant amounts of CEA are not typically present.
What Does a Positive CEA Blood Test Mean in Adults?
Since CEA levels are usually low or absent in healthy adults, a positive CEA blood test (meaning an abnormally high level) can be a significant finding.
According to the reference:
- In adults, an abnormal level of CEA may be a sign of cancer.
It's important to understand that while an elevated CEA level may indicate cancer, it is not a definitive diagnosis on its own. Other non-cancerous conditions can also cause CEA levels to rise.
Key Implications of a Positive CEA Test:
- Potential Indicator: It serves as a potential marker that requires further investigation.
- Not Diagnostic: It does not confirm a specific type of cancer or any cancer at all by itself.
- Further Testing Needed: An elevated CEA level typically prompts healthcare providers to order additional tests and evaluations to determine the cause.
In summary, a positive CEA blood test highlights an abnormally high level of this protein in an adult's blood, which, according to the provided reference, "may be a sign of cancer," necessitating further medical assessment.
