Which substance is primarily corrected during hemodialysis for metabolic acidosis?

During hemodialysis for metabolic acidosis, the primary substance that is addressed is indeed potassium. This is because metabolic acidosis is often characterized by an accumulation of hydrogen ions in the bloodstream and can lead to alterations in potassium levels. In chronic kidney disease, the kidneys lose their ability to excrete potassium effectively, which can result in hyperkalemia.

In the context of hemodialysis, the process helps to remove excess potassium from the blood, thus correcting hyperkalemia and aiding in the management of acidosis. By lowering potassium levels, it directly impacts the body’s acid-base balance, as elevated potassium can exacerbate the effects of acidosis.

While other substances like calcium, sodium, and phosphate are important in the broader context of renal management and metabolic functions, potassium is the primary focus when specifically addressing metabolic acidosis during hemodialysis.