where PCr = plasma concentration of creatinine, UCr = urinary concentration of creatinine, and UNa = urinary concentration of sodium. A value below 1.0 indicates renal failure due to prerenal azotemia and a value above 2.0 suggests that it is due to acute tubular necrosis. Cf. fractional excretion of sodium, under excretion.
Medical dictionary. 2011.
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