Detection of specific gravity

Detection of specific gravity

Principle---Specific gravity of urine depends upon the solute present in the urine.When solutes increases ,specific gravity of urine also increases.

Specific gravity is the density of substance ,which is compaired to density of water. Density of water is 1.

Specific gravity of normal urine is—1.012 to 1.025.

Urinometer is used to measure specific gravity of urine.

Parts of Urinometer---1) Stem---is elongated & graduated.

2) Base –is rounded and heavy.                     

Graduation on stem is1.000 at the top & 1.060 at the bottom .

Procedure---Take 20 ml of urine in vertical cylinder.Take another cylinder & fill it with distilled water.Now hold the urinometer with its stem & gently release the urinometer in the cylinder containing distilled water.Let the urinometer float and become stable.When it becomes stable measure the specific gravity of distilled water.----which is 1.

Now hold the urinometer at the top & slowly release the urinometer in the cylyndercontaining urine.Urinometer should float in the urine & should not touch the sides of cylinder.When urinometer becomes  steady then take the reading of specific gravity from the graduations on the stem.Take reading of the lower curvature of the fluid.

Keep the urinometer clean with fresh water and dry it with tissue paper.