cute renal failure is a condition in which the glomerular filtration rate is abruptly reduced, causing a sudden retention of endogenous and exogenous metabolites (urea, potassium, phosphate, sulfate, creatinine, administered drugs) that are normally cleared by the kidneys. The urine volume is usually low (un­der 400 mL/d). However, if renal concentrating mechanisms are impaired during acute renal failure, the daily urine volume may be normal or even high (high-output or nonoliguric renal failure).
http://intranet.tdmu.edu.ua/data/kafedra/internal/hospital_s...