dependence of hydrophytic vegetation, hydric soils, and wetland hydrology and that certain vegetation and soils are valid indicators of wetland hydrology in many circumstances. This protocol was criticized by threeÂ­ parameter fundamentalists who felt that there was a lack of sufficient hydrologic evidence to make a wetÂ­ land determination.
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Reference Range. Urinary specific gravity (SG) is a measure of the concentration of solutes in the urine. It measures the ratio of urine density compared with water density and provides information on the kidneyâs ability to concentrate urine.A urinary specific gravity measurement is a routine part of urinalysis.escription. Urinary specific gravity is a measure of the concentration of solutes in the urine and provides information on the kidneyâs ability to concentrate urine. Urine osmolality is a more specific test for urine concentration; however, urine specific gravity measurement is a routine part of urinalysis.