Urine Specific Gravity
Encyclopedia
Urine specific gravity is a laboratory
Laboratory
A laboratory is a facility that provides controlled conditions in which scientific research, experiments, and measurement may be performed. The title of laboratory is also used for certain other facilities where the processes or equipment used are similar to those in scientific laboratories...

 test that measures the concentration of particles in the urine
Urine
Urine is a typically sterile liquid by-product of the body that is secreted by the kidneys through a process called urination and excreted through the urethra. Cellular metabolism generates numerous by-products, many rich in nitrogen, that require elimination from the bloodstream...

. Normal values are between 1.020 to 1.028 Osmolality is normally used for more detailed analysis but USG remains popular for its convenience.
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