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.