Test ID: CGA
Chromogranin A, Serum
Secondary ID 
A test code used for billing and in test definitions created prior to November 2011
Useful For Suggests clinical disorders or settings where the test may be helpful
Diagnosis of carcinoid tumors. Serum chromogranin A measurements are a first-line test for diagnosing carcinoid tumors, in conjunction with, or as an alternative to, measurements of serum or whole blood serotonin, urine serotonin, and urine 5-hydroxyindoleacetic acid (5-HIAA). This includes the differential diagnosis of isolated symptoms suggestive of carcinoid syndrome, in particular, flushing.
Follow-up of patients with known or treated carcinoid tumors. Serum chromogranin A and urine 5-HIAA measurements are the first-line tests used in carcinoid tumor follow-up.
As an adjunct in the diagnosis of other neuroendocrine tumors, including pheochromocytomas, MTC, functioning and nonfunctioning islet-cell and gastrointestinal APUD tumors, and pituitary adenomas. In these conditions serum chromogranin A measurements complement measurements of specific secretory products and hormones.
As a possible adjunct in outcome prediction and follow-up in advanced prostate cancer
Method Name A short description of the method used to perform the test
Immunochemiluminometric Assay (ICMA)
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