The chromogranin A (CgA) test is used as a tumor marker. It may be ordered in combination with a 5-HIAA test to help diagnose carcinoid tumors. It may also be used to detect the presence of other tumors arising from neuroendocrine cells.
To help diagnose and monitor carcinoid tumors and other neuroendocrine tumors.
To interpret test results use the reference range in the laboratory report.
Fasting may be required; follow any instructions from your healthcare provider or laboratory.
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