PT - JOURNAL ARTICLE AU - Jonathan Gotfried AU - Jonathan Wiesen AU - Rupesh Raina AU - Joseph V. Nally, Jr TI - Finding the cause of acute kidney injury: Which index of fractional excretion is better? AID - 10.3949/ccjm.79a.11030 DP - 2012 Feb 01 TA - Cleveland Clinic Journal of Medicine PG - 121--126 VI - 79 IP - 2 4099 - http://www.ccjm.org/content/79/2/121.short 4100 - http://www.ccjm.org/content/79/2/121.full SO - Cleve Clin J Med2012 Feb 01; 79 AB - The fractional excretion of urea (FEU) is a useful index for differentiating the main categories of causes of acute kidney injury, ie, prerenal causes and intrinsic causes. It may be used in preference to the more widely used fractional excretion of sodium (FENa) in situations in which the validity of the latter is limited, such as in patients taking a diuretic.