What is one function dialysis does not perform compared to kidneys?

Dialysis is an artificial process that replicates some functions of the kidneys, but it does not fully replace all of the kidneys' functions. One such function is the regulation of hormone levels, particularly those hormones related to kidney function such as erythropoietin, which stimulates red blood cell production, and renin, which is involved in blood pressure regulation.

While dialysis effectively removes waste products and maintains electrolyte balance, as well as helps in regulating blood pH, it lacks the capacity to regulate the hormonal functions that the kidneys perform. This is due to the fact that hormones are produced and released into the bloodstream by the kidneys, and dialysis does not have the capability to produce or regulate these hormones. Hence, the inability of dialysis to perform this specific function compared to healthy kidneys makes it distinct in the context of renal function.