The urinary metabolite that is elevated in patients with pheochromocytoma.
Metabolic product of catecholamines representing approx. 90% of the metabolites of catecholamines epinephrine and norepinephrine. VMA’s are secreted in the urine. Persons with pheochromocytoma produce excess amounts of catecholamines; thus, increased amounts of VMA are present in their urine.