<prompt> Fractional excretion of sodium 1 is seen inPre renal azotemiaAcute tubular necrosisAcute ureteral obstructionInterstitial nephritis  <response>: Ans. is a i.e., Pre renal azotemia Urine Diagnostic Indices in differentiation of prerenal Vs Intrinsic Renal FailureDiagnostic IndexPrerenalARFIntrinsic Renal ARF Fractional Excretion of Na1 1 Urine Sodium Concentration mmolL1020 Urine Creatinine to Plasma Creatinine ratio4020 Urine osmolality mosmolkgH20500 300 Renal failure Index11 Urine urea Nitrogen to plasma urea Nitrogen83 Plasma BUNCreatinine Ratio20 10-15 Urinary SedimentHyalineCastsMuddy Brown Granular Cast Urine Specific gravity 1.020-1.010o Acute tubular necrosis is a cause of intrinsic ARF. 