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Test Code UHIAAQ 5-HIAA Quantitative, Urine

Patient Instructions

Avoid bananas, avocados, plums, eggplant, tomatoes, avocados plums, eggplant, tomatoes, plantain, pineapple, walnuts, and interfering drugs for a 72 hour period prior to and during collection. Foods and medications associated with altered urinary HIAA results: Decreased HIAA: Aspirin, chlorpromazine (Thorazine), corticotropin, dihydroxyphenylacetic acid, alcohol, gentisic acid, homogentisic acid, hydrazine derivatives, imipramine (Tofranil ), <isocarboxazid (Marplan), keto acids, levodopa, MAO inhibitors, methenamine methyldopa (Aldomet ), perchlorperazine, phenothiazines (Compazine ), promazine, promethazine (Mepergan ). Increased HIAA: Acetaminophen, acetanilide, caffeine, coumaric acid, diazepam (Valium ), ephedrine, fluorouracil glycerol guaiacolate (Guaifenesin), melphalan (Alkeran ), mephenesin, methamphetamine (Desoxyn), methocarbamol (Robaxin ), naproxen, nicotine, phenacetin,phenmetrazine, phenobarbital, phentolamine, rauwolfia, reserpine.

Collection Container

24 hour urine jug, kept refrigerated during and after collection

Specimen Required

24 hour urine

Refrigerate during and after collection period

Specimen Volume

Entire 24 hour collection

Minimum Specimen Volume

1 mL

Transport Temperature


Turnaround Time

5-9 days

CPT Code


EMR Interface Order Code