Which of the following best describes hemodialysis?

Hemodialysis is best described as a method to filter and purify blood. This medical procedure is primarily used for patients whose kidneys are not functioning effectively due to conditions such as chronic kidney disease. In hemodialysis, a machine and a dialyzer (artificial kidney) are used to remove waste, excess fluids, and toxins from the blood, effectively performing the functions that healthy kidneys would typically carry out.

This option highlights the core purpose of hemodialysis, which is to ensure that patients maintain an appropriate balance of electrolytes and eliminate harmful substances from their bloodstream, thus supporting overall bodily function. Hemodialysis is essential for managing patients with kidney failure or those waiting for a kidney transplant. Understanding this function is crucial for healthcare providers involved in the treatment and management of patients with renal impairments.