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Fishberg concentration test

(fĭshbərg)
n.
  1. A test of renal water conservation in which urine samples are collected after the individual has abstained from fluids overnight and the specific gravity of the urine is measured.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.