urine catecholamine excretion rate urine vanillylmandelic acid excretion rate 2014-08-26T11:49:28Z CHEBI:20106 CMO:0002571 JSmith The amount of vanillylmandelic acid eliminated from the body in the urine per unit time. Vanillylmandelic acid is the major urinary metabolite of adrenal and sympathetic catecholamines such as epinephrine and norepinephrine. VT:0010606 clinical_measurement_ontology urine 3-methoxy-4-hydroxymandelic acid excretion rate urine VMA excretion rate