What is hemodialysis primarily used for?

Hemodialysis is primarily used to remove waste and excess fluids from the blood when the kidneys are no longer able to perform this function effectively, particularly during renal failure. In cases of acute or chronic kidney failure, the kidneys lose their ability to filter out toxins and produce urine, leading to a dangerous buildup of waste materials in the bloodstream.

Hemodialysis utilizes a machine that acts as an artificial kidney to perform the filtration process. During treatment, blood is drawn from the body, filtered through a dialyzer, and then returned to the body after impurities have been removed. This is a critical procedure for patients who are unable to maintain proper balance of fluids and electrolytes in their bodies, helping to prevent complications associated with electrolyte imbalances and uremia.

The other options do not accurately represent the primary function of hemodialysis. For instance, increasing blood pressure, enhancing kidney recovery, and promoting hydration are not the main objectives of this treatment method. Instead, the focus of hemodialysis is on detoxifying the blood and ensuring that harmful substances are effectively removed.