|Values are valid only on day of printing.|
Detecting meningeal carcinomatosis, intradural or extradural infiltration, or brain parenchymal metastasis from adenocarcinoma or squamous-cell carcinoma
Carcinoembryonic antigen (CEA) normally is present in cerebrospinal fluid (CSF) in very low concentrations. Elevations in serum CEA can cause passive transfer to CSF. Tumors of the brain, especially metastatic tumors, can elevate CSF CEA.
Tumor markers are not specific for malignancy, and values may vary by method.
Increased values are seen in approximately 60% of patients with meningeal carcinomatosis.
Although the assay appears to be specific for adenocarcinoma and squamous cell carcinoma, increased carcinoembryonic antigen (CEA) values in cerebrospinal fluid (CSF) are not seen in all patients with such tumors of the brain.
Mildly elevated CEA values in CSF may be secondary to passive transfer from the serum in individuals with high serum CEA concentrations.
Some patients who have been exposed to animal antigens, either in the environment or as part of treatment or imaging procedure, may have circulating anti-animal antibodies present. These antibodies may interfere with the assay reagents to produce unreliable results.
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3. Moertel CG, et al: An evaluation of the carcinoembryonic antigen (CEA) test for monitoring patients with resected colon cancer. JAMA 1993;270:943-947