How are you? Function of the kidneys is estimated with the help of blood urea and urine creatinine levels. The assessment depends upon the filtrating capacity of the kidney and this inturn depends upon glomerular filtration rate(GFR).
GFR 100% is considered normal. GFR between 60-89% is considered to be in stage 2.
Stage 2 kidney disease is a tricky area, because normal GFR falls with age, and therefore many normal older people may fall into this category. Equations used to predict GFR (rather than real measurements) may also give falsely low results in people with near-normal function. Initially what is causing the renal failure has to be determined then treatment of the cause should be taken up.
Control of blood pressure, maintaining water sodium balance, supplementation with iron and erythropoietin to prevent anemia, maintaining calcium and phosphorus balance, diet with optimum protein and salt are the main objectives of treatment of renal failure. This can prevent the early transformation into end stage renal disease.
Consult your doctor for further assistance.
All the best.