Urine Specific Gravity
Alternate Names : Urine Density, Urine S.G.
Definition This test measures the specific gravity of the urine, which is a reflection of the concentration of particles in the urine (see also urine concentration test).
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Why is the Test Performed?
Specific gravity measures the concentration of particles in a solution (i.e., grams/ml). Osmolality is a more exact measurement of urine concentration than specific gravity because specific gravity depends on the precise nature of the molecules present in the urine.
Specific gravity also requires correction for the presence of glucose or protein. But the specific gravity measurement is easier and more convenient to test. It frequently makes the osmolality measurement unnecessary.
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