Pre-renal azotemia is associated with one of the following characteristic feature :: (A) Urinary Na+ < 10 mmol/L, (B) Renal failure index > 1, (C) Osmolality < 500, (D) Urinary creatinine / P. creatinine ratio < 20
Answer is A. Answer is A (Urinary Na+ < 10 mmol/litre): Prerenal azotemia is associated with a urinary sodium excretion of less than 10 mmol/L.