The main job of the kidneys is to separate waste products. They absorb what is required, and excrete the waste in our urine. The most important waste products are excessive sodium and water. Each kidney contains a couple of million filtering units referred to as nephrons. They eliminate wastes from the body, regulate the degree and pressure of blood, and control levels of electrolytes and blood acidity.

Chronic renal failure (CRF) is that the progressive loss of kidney functions. As a result levels of blood urea and serum creatinine go on increasing day by day. Chronic loss of operation causes generalized wasting (shrinking in size) and progressive scarring within all parts of the kidneys. The tragedy is this when the patients realize his sickness, the approximate total harm of 70 % of total kidneys has done.