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Chromogranin A

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Also known as: CgA
Formal name: Chromogranin A

At a Glance

Why Get Tested?

To help diagnose and monitor carcinoid tumors and other neuroendocrine tumors

When to Get Tested?

When you have symptoms suggestive of a carcinoid tumor such as flushing, diarrhea, and/or wheezing; when your doctor thinks that you may have a carcinoid or other neuroendocrine tumor

Sample Required?

A blood sample drawn from a vein in your arm

Test Preparation Needed?

Fasting may be required; follow any instructions from your doctor or laboratory