5-HIAA

HIAA; 5-hydroxyindole acetic acid; Serotonin metabolite

5-HIAA is a urine test that measures the amount of 5-hydroxyindoleacetic acid (5-HIAA). 5-HIAA is a breakdown product of a hormone called serotonin.

This test tells how much 5-HIAA the body is producing. It is also a way to measure how much serotonin is in the body.

How the Test is Performed

How to Prepare for the Test

How the Test will Feel

Why the Test is Performed

Normal Results

What Abnormal Results Mean

Risks