2 ML (1 ML MIN.) PLASMA FROM 1 LAVENDER TOP EDTA TUBE AND 50 ML (10 ML MIN.) ALIQUOT OF 24-HOUR URINE. COLLECT URINE WITHAPPROPRIATE VOLUME OF 50% HCL TO MAINTAIN PH BETWEEN 1 2. DO NOT USE CONCENTRATED HCL. RECORD 24 HOUR VOLUME ON TEST REQUEST FORM AND URINE CONTAINER. SHIP FROZEN. PATIENT SHOULD STRICTLY AVOID ALPHA-ONE BLOCKERS, AMINOPHYLLINE, AMPHETAMINES, AMPICILLIN, BETA-BLOCKERS, EPHEDRINE, IMIPRAMINE, METHYLDOPA, BUSPIRON, CODEINE, L-DOPA, MAO INHIBITORS, NICOTINE, PHENACETIN, PHENOTHIAZINE, THEOPHYLLINE, VASODILATORS, ASPIRIN,PAS, ALPHA-TWO AGONISTS, BROMOCRIPTINE, CALCIUM CHANNEL BLOCKERS (LONG TERM USE), CLOFIBRATE, PROPRANOLOL, PENICILLIN, RESERPINE, THYROXINE, ALPHA-METHYLDOPA, ISOPROTERENOL, LABETALOL, MANDELAMINE, PARACETAMOL, CIMETIDINE, METOCLOPRAMIDE, VIGOROUS EXERCISE, ALCOHOLIC BEVERAGES, TEA/COFFEE, TOBACCO, CHOCOLATE, PEPPER, VANILLA & BANANA AT LEAST 72 HOURS BEFORE AND DURING SPECIMEN COLLECTION.