Which of the following values are suggestive of acute tubular necrosis :
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
Urine osmolality>500
Urine sodium>40
Blood urea nitrogen/plasma creatinine>20
Urine creatinine /plasma creatinine>40