What Is Serotonin Metabolite 5-hydroxyindoleacetic Acid?
5-HIAA is a urine test that measures the amount of 5-hydroxyindoleacetic acid (5-HIAA) -- a breakdown product of a hormone called serotonin.
This test tells how much 5-HIAA the body is producing.
Alternative Names
HIAA; 5-hydroxyindole acetic acid; Serotonin metabolite
How the test is performed
A 24-hour urine sample is needed.
- On day 1, urinate into the toilet when you get up in the morning.
- Afterwards, collect all urine in a special container for the next 24 hours.
- On day 2, urinate into...
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