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oral lactose tolerance test

n.
  1. A test for deficiency of the enzyme lactase, which metabolizes lactose into glucose, in which plasma glucose levels are measured after a quantity of lactose has been ingested.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.