01 Oct
The evaluation of plasma catecholamines is utilized in the differential diagnosis of pheochromocytoma. In addition, monitoring norepinephrine levels in association with clonidine suppression has been recommended as a means of distinguishing patients with pheochromocytoma from patients with essential hypertension. Measurement of plasma norepinephrine levels may aid in the differential diagnosis of orthostatic and postural hypotension.