General approach to AKI - Checklist Urine electrolytes & FENa - Previously, it was believed that urine sodium excretion and fractional excretion of sodium (FENa) could help differentiate between pre-renal and intrinsic renal failure. However, more recent research has shown that FENa performs poorly. Urine eosinophils - This has poor performance for diagnosing acute tubular interstitial nephritis. - Dr. Josh Farkas @PulmCrit #AKI #Checklist #AcuteKidneyInjury #Nephrology #CriticalCare