3 mL EDTA plasma Frozen < 1hr. Hemolyzed samples not acceptable. The blood should be taken with the patient sitting in an upright position after having rested for10 minutes. MAO Inhibitors, alpha-metyldopa, Tricyclic antidepressants, Calcium antagonists, ACE Inhibitors, Bromocriptine , Chlorpromazine should be stopped at least one week before taking the blood sample . Antidepressants (except Lithium) should be stopped at least 3 weeks before. Avoid stress and the intake of Amphetamines, nicotine, caffeine, alcohol, Aspirin, Quinidine, Tetracycline, Theophyllin, Erythromycin, medicine withdrawal (Ethanol, Clonidine), Vasodilatator therapy (e.g. Phenoxybenzyamine), nose drops, bronchodilatators, appetite depressants, cough syrup.
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