Which of the following values are suggestive of acute tubular necrosis :: (A) Urine osmolality>500, (B) Urine sodium>40, (C) Blood urea nitrogen/plasma creatinine>20, (D) Urine creatinine /plasma creatinine>40
Answer is B. Answer is B (Urine sodium > 40) Urinary sodium excretion of more than 20mmol/L suggests intrinsic renal failure such as ATN Urine Diagnostic Indices: Differentiation of Prerenal and Intrinsic Renal failure. Acute tubular necrosis is a cause of Intrinsic ARF.Q