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Saundby's test

[sônd′bēz]
n.
  1. A test for blood in the stool in which hydrogen peroxide solution is added to a mixture of a saturated benzidine solution and a small quantity of feces in a test tube; a persistent dark-blue color indicates the presence of blood.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.