a test for pheochromocytoma; intravenous administration of phentolamine (5 mg) reduces hypertension due to a pheochromocytoma but not that due to other causes, for example, essential hypertension; the blood pressure is raised by the drug in the latter form of hypertension.
Farlex Partner Medical Dictionary © Farlex 2012
phentolamine testA pharmacologic test for pheochromocytoma, in which an α-adrenergic blocker, phentolamine, is administered IV; a significant drop in bp, confirmed by quantifying catecholamines or their metabolites in the urine. See Catecholamines, Pharmacological testing.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.