Blood test S-CEA (Carcinoembryonic antigen S)
This blood test is called S-CEA and is used to measure the level of carcinoembryonic antigen (CEA) in the blood. CEA is a marker that doctors use to help detect and monitor colorectal cancer, which is cancer of the colon or rectum.
Colon and rectal cancer, also known as colorectal cancer, is the third most common form of cancer in Sweden. Annually, over 5,000 people are diagnosed with colon cancer and more than 2,100 with rectal cancer. The average age of those affected by these forms of cancer is 73 years for colon cancer and 70 years for rectal cancer.
By measuring the concentration of CEA in the blood, doctors can get important information about how cancer patients are doing. It can help them see if cancer is present, how it's progressing, and how effective the treatment is. Sometimes elevated levels of CEA can also occur in other types of cancer or in certain harmless diseases, so test results should be interpreted with caution.
The CEA test is used in various situations to check if cancer is present or how it is being treated. Here are some common reasons why the test is recommended:
- Suspicion of colorectal cancer
- Follow-up of treatment for colorectal cancer
- Control of possible recurrence of colorectal cancer
Elevated levels of CEA can also be seen in:
- Colorectal cancer (90% of cases)
- Pancreatic cancer (80% of cases)
- Lung cancer (about 50% of cases)
- Breast cancer (55% of cases)
- Stomach cancer (ventricular cancer)
- Medullary thyroid cancer
For whom is a CEA test recommended?
Blood tests for CEA are recommended when colorectal cancer or other cancers are suspected. The test is also used to monitor patients undergoing treatment for cancer, to assess the effectiveness of treatment and to detect possible recurrences. CEA levels may be elevated in various benign conditions, such as liver cirrhosis, ulcerative colitis, emphysema, and inflammatory diseases.
Reference interval
Normal reference values for CEA are usually below 5 ng/mL. Levels above this may indicate the presence of cancer or other diseases. It is important to note that reference values may vary depending on the laboratory and the method used to analyze CEA, which means that test results should be interpreted with caution.