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vanillylmandelic acid test

n.
  1. A test for catecholamine-secreting tumors performed on a 24-hour urine specimen and based on the fact that vanillylmandelic acid is the major urinary metabolite of norepinephrine and epinephrine.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.