5-HIAA
Also known as: 5-hydroxyindoleacetic acid; HIAA; Serotonin metabolite
Formal name: 5-hydroxyindoleacetic acid
Related tests: Serotonin; Chromogranin A
At a Glance
Why Get Tested?
To help diagnose and monitor treatment for a serotonin-secreting carcinoid tumor
When to Get Tested?
When you have symptoms suggestive of a carcinoid tumor such as flushing, diarrhea, and/or wheezing, and at intervals following treatment
Sample Required?
A 24-hour urine sample; rarely a random urine sample
Test Preparation Needed?
You may be instructed to avoid certain foods and medications prior to this test.
