Urine specific gravity

Source: Wikipedia, the free encyclopedia.
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

Specific gravity, in the context of

renal diseases
.

Background

For background on kidney function, see
Renal function
.

One of the main roles of the

specific gravity
. In adult humans, normal specific gravity values range from 1.010 to 1.030.

Specific gravity and disease

Adults generally have a specific gravity in the range of 1.010 to 1.030. Increases in specific gravity (hypersthenuria, i.e. increased concentration of solutes in the urine) may be associated with

Hypovolemic
patients usually have a specific gravity >1.015.

Decreased specific gravity (hyposthenuria, i.e. decreased concentration of solutes in urine) may be associated with

psychogenic polydipsia).[3][4]

Osmolality is normally used for more detailed analysis, but USG remains popular for its convenience.[5]

References

  1. ^ Explanation of Hepatorenal Syndrome on MedlinePlus
  2. PMID 9841955
    .
  3. ^ Explanation of Acute Tubular Necrosis on MedlinePlus
  4. ^ Explanation of Interstitial Nephritis on MedlinePlus
  5. ^ "Urine specific gravity". MedlinePlus : U.S. National Library of Medicine. Retrieved 31 May 2013.
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