Azotemia appears when residual GFR is:: (A) 50% -80 % of normal, (B) 20-50% of normal, (C) 10 -20% of normal, (D) < 5% of normal
Answer is B. Answer is B (20-50% of Normal): Azotemia appears in the stage of Renal Insufficiency when the residual renal function (Residual GFR) is between 20 to 50 percent of normal.