“Acute renal failure is abrupt deterioration in renal function, which is usually, but not invariably reversible over a period of days or weeks, and usually accompanied by a reduction in urine volume.

In contrast; chronic renal failure is the clinical syndrome of the metabolic and systemic consequences of a gradual, substantial and irreversible reduction in the excretory and homeostatic functions of the kidneys.

Both of these conditions, if untreated, ultimately results in end stage renal failure where the death is likely without renal replacement therapy.”

National Kidney Foundation