vanillylmandelic 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

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