I am a 43 years old man. My problem is since last 5years my blood creatinine level is 1.5 to1.7 but my urea level is absolutely normal.

Creatinine and urea. Your creatinine level is a function of your age, weight, race and sex. You may have good renal function if you are a muscular male african-american. Your BUN is based on your protein intake and your state of hydration. See a nephrologist to have a 24 hour urine collection done for a creatrinine clearance and protein determination to see what your kidney function really is.