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 tumour

When to Get Tested?

When you have symptoms suggestive of a carcinoid tumours such as flushing, diarrhoea, and/or wheezing and at intervals following treatment

Sample Required?

A 24-hour urine sample; rarely a random urine sample

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This article was last reviewed on January 12, 2007. | This page was last modified on January 5, 2010.

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