50 ML (10 ML MIN.) ALIQUOT OF RANDOM URINE. ADD 50% HCL DROP BY DROP TO BRING THE PH BETWEEN 1-2. DO NOT USE CONCENTRATED HCL. SHIP REFRIGERATED OR FROZEN. PATIENT SHOULD STRICTLY AVOID BANANA, KIWI, WALNUT, AVOCADO, BRINJAL, PINEAPPLE, PLUM, TOMATO & DRUGS LIKE 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.