5 Hydroxy Indole Acetic Acid (5HIAA)
Clinical Biochemistry
Sample and container requirements
Acidified 24 hr Urine
Minimum volume required
3 mL urine
Special requirements
None
Patient preparation
5HIAA is affected by diet; levels can increase following ingestion of pineapples, bananas and some nuts.
Sample viability
Turnaround time
14 days
Reference range
<50 μmol/24hr
Clinical guidance
Please refer to LabTestsOnlineUK to learn more about 5HIAA. https://labtestsonline.org.uk/tests/5-hydroxyindoleacetic-acid-5-hiaa
Notes
Images to go here
This information was last updated on 19 August 2026