renal failure index

(RFI) an assessment of acute renal failure comparing the sodium clearance with the creatinine clearance:

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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