5 - HIAA (5-Hydroxy Indole Acetic Acid), 24 Hrs Urine

Fluorouracil, Melphalan, Paracetamol & Acetaminophen, Heparin, L-dopa, Reserpine, Salicylates, Chlorpromazine, Imipramine, Isoniazid, MAO inhibitors, Phenothiazines, Promethazine, alcoholic beverages, caffeine, tea/coffee, tobacco and strenuous exercise at least 72 hrs before and during specimen collection. 24 hours Urine sample collection starts after excluding the first morning urine sample, subsequent Urine to be collected till next day morning first sample.