A blood sample taken from an elbow vein is required for the test.
High CEA levels are not always a problem. However, it can occur in cirrhosis, colon cancer, or other cancers. The test result is best suited during treatment, to monitor it, and to detect tumor recurrence.
The CEA test alone is not enough to make a diagnosis, as in most cases other, additional tests are needed, and the test is mostly performed for non-diagnostic purposes (recurrence of the disease, assessment of the effectiveness of treatment). In all cases, please consult the specialist who ordered the test.