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Laboratory Test Directory

5-Hydroxyindoleacetic Acid (5-HIAA), 24 Hour, Urine


Name Method Department Units
5-Hydroxyindoleacetic Acid (5-HIAA), 24 Hour, Urine Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Send Out mg/24 hours

Specimen Requirements

Urine, 24 hours

Container Type Container Size Specimen Volume

24 hour urine container

N/A 5 mL

Refrigerated - 56 day(s)
Frozen - 12 month(s)

Specimen Preparation

  • Refrigerate during collection
  • Urine collection: Note start and stop dates and times on requisition
  • Transport to laboratory as soon as possible

Reasons for Rejection

  • Wrong type of specimen


1. Some prescription medications could interfere with test results. The ordering provider should decide if any medications should be stopped and when they should be restarted.

2. For 48 hours before patients start their urine collection and during the 24 hours they collect urine:  Limit the following to 1 serving per day: Fruits, Vegetables, Nuts, Caffeinated beverages or foods

If clinically feasible, discontinue the following medications at least 48 hours before specimen collection:  Acetaminophen (Tylenol or generic versions), Aspirin, Antihistamines, Cough syrups, Cold and flu medications

At beginning of collection have patient void and discard this urine. Begin timing collection at this point and collect all urine until the end of the collection period. Have patient void and save urine at the final collection period.

CPT Code

  • 83497