Specimen Requirements


5-HIAA (5-Hydroxyindole Acetic Acid), Random Urine

Specimen Requirement

Send 15 mL urine in a sterile container, minimum 5 mL.

Patients should not eat avocado, banana, butternut, cantaloupe, dates, eggplant, grapefruit, hickory nuts, honeydew, kiwi fruit, melons, nuts, pecans, pineapple, plums, tomatoes, or walnuts for a 48 hour period prior to start and duration of collection. Could result in falsely elevated 5-HIAA excretion. Medications affecting metabolism of serotonin must be avoided at least 72 hours before and during collection. Patients should also avoid coffee, tea and tobacco. Patient should consult their physician before discontinuing any medication.


High Performance Liquid Chromatography


Room temp: Unacceptable, Refrigerated: 7 days, Frozen: 14 days

Reference Range

The reference range is determined by the performing laboratory and will show on the report.


1-4 days performed Monday-Friday

Clinical Use

Test Code