Urine specific gravity

For explanation of the ratio of densities of two materials, see Relative density.
Urine specific gravity
Reading of a urine specific gravity of ~1.024 via a handheld refractometer. SG measurement is taken by reading the boundary between the dark and light fields against the graduations on the left column.
Purposeevaluation of kidney function
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Specific gravity, in the context of clinical pathology, is a urinalysis parameter commonly used in the evaluation of kidney function and can aid in the diagnosis of various renal diseases.