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Specific Gravity of urine | Urinometer-Refractometer
Specific gravity
Specific gravity measurements are one of the physical examinations performed during a routine urinalysis.
Urine specific gravity is defined as the density (or weight) of the urine specimen as compared to the density (weight) of distilled water at the same temperature.
The density of the urine specimen is dependent on the
amount and size of the dissolved substances present
in the urine specimen.
These include such substances as glucose, proteins, and electrolytes. The kidneys are responsible for selective reabsorption of essential chemicals and fluid after the blood is filtered.
Abnormal specific gravity values may be an early indication of renal dysfunction.
Low specific gravity urine is considered to be dilute with very few dissolved substances, whereas urine with a high specific gravity indicates that the urine is concentrated with increased amounts of dissolved substances.