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Chromogranin A

Also known as: CgA
Formal name: Chromogranin A
Related tests: Serotonin, 5-HIAA, Catecholamines, Tumor Markers

Common Questions

1.  Should everyone have a Chromogranin A test?

No. This test is usually ordered to help diagnose and monitor a carcinoid or other neuroendocrine tumor, both of which are uncommon. Most people will never need to have this test performed.

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2.  How does a doctor locate the carcinoid or neuroendocrine tumor?

This is usually accomplished through the use of imaging scans such as x-rays, computed tomography (CT), or magnetic resonance imaging (MRI). In some cases, surgery is required to find the tumor.

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3.  How does the doctor tell whether a tumor is benign or cancerous?

In order to determine whether the tumor is benign or cancerous, the doctor will need to perform a biopsy or remove the tumor surgically and look at the tumor cells under the microscope.

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