Dialysis is typically required when what percentage of kidney function is lost?

Dialysis is typically required when approximately 90% of kidney function is lost, which is represented by the correct choice. As kidney function declines, the ability to filter waste products and excess fluids from the blood diminishes significantly. When around 90% of nephron function is lost, the kidneys can no longer effectively regulate bodily functions, leading to the accumulation of toxins and imbalances that dialysis is designed to correct.

In clinical practice, this condition is referred to as end-stage renal disease (ESRD), where the kidneys can no longer maintain homeostasis, warranting renal replacement therapy through dialysis or transplantation. Recognizing the threshold at which dialysis becomes necessary is essential for timely intervention to prevent complications associated with advanced kidney failure.