Monday, July 13, 2009

FeNa Calculator

Calculates the fractional excretion of sodium based on urine sodium, plasma sodium, urine creatinine, and serum creatinine. Determines the cause of acute renal failure.


FeNa < 1 % - prerenal failure: dehydration more than chf

FeNa > 2 % - intrinsic disease: acute tubular necrosis, vasculitis, interstitial nephritis



1. Le, Tao, Vikas Bhushan, Robert W. Grow, and Veronique Tache.First Aid for the USMLE Step 3. 2nd ed. New York: McGraw Hill, 2008. Print.



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