“Acute kidney injury happens when the kidneys suddenly can’t filter waste products from the blood. When the kidneys can’t filter wastes, harmful levels of wastes may build up. The blood’s chemical makeup may get out of balance.

Acute kidney injury used to be called acute kidney failure. Acute kidney injury is most common in people who are in the hospital, mostly in people who need intensive care.

Acute kidney injury ranges from mild to severe. If severe, ongoing and not treated, it can be fatal. But it also can be reversed. People in otherwise good health may get back typical or nearly typical use of their kidneys.”

MAYO CLINIC (Acute kidney injury – Symptoms and causes – Mayo Clinic)