What is the surface area of a dialysis machine in retrospect to the kidneys?

thx

You can't really compare them, they are like apples and oranges.

If you're going to compare human kidneys to artificial kidneys, you need to think in terms of clearances, not surface area.

Artificial kidneys are better than human kidneys at clearing many substances from blood over the same time period. However, human kidneys have the advantage of functioning 24/7.