A "Tumor marker": The chromogranin a test is used as a tumor marker. It may be ordered in combination with or in place of 5-hiaa to help diagnose carcinoid tumors. It is also used to help monitor the effectiveness of treatment and detect recurrence of this tumor. Sometimes it may be ordered with specific hormones, such as catecholamines, to help diagnose and monitor a pheochromocytoma. It may also be used to detect.
Answered 8/18/2014
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