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Chromogranin A is the first line test for diagnosing Carcinoid tumors. It is used as a followup test for treated cases of Carcinoid tumors. It is useful as an adjunct in the diagnosis of other Neuroendocrine tumors including Pheochromocytoma, Pituitary adenomas and functioning & non-functioning Islet cell and Gastrointestinal APUD tumors.
Proton pump inhibitor medications should be discontinued for at least 2 weeks prior to sample collection.