Kidney function may quickly return to normal if the cause of Acute Renal Failure (ARF) is diagnosed and corrected. ARF may be corrected within a few days, or it may last for more than a month. Chances of recovery from ARF depend on many factors, including what caused the ARF, how severe and prolonged it was, how quickly the problem was recognized and treated, and what other medical conditions the person has.
"Acute Renal Failure
caused by dehydration, blood loss, or obstruction in the urinary system rapidly reversed". About 50% of people who develop ARF recover completely. Some may have only partial recovery and others may require long term dialysis.