vanillylmandelic acid test
(redirected from 3-methoxy-4-hydroxymandelic acid test)va·nil·lyl·man·del·ic ac·id test
a test for catecholamine-secreting tumors (pheochromocytoma and neuroblastoma) performed on a 24-hour urine specimen; it is based on the finding that vanillylmandelic acid is the major urinary metabolite of norepinephrine and epinephrine.
Synonym(s): 3-methoxy-4-hydroxymandelic acid test, VMA test