What is the best way to assess exercise capacity in kidney transplantation candidates to predict post-transplant outcomes?  

This is a great question and quite variable across centers. The most consistently used across centers is the 6 min walk, though we are not yet doing that. Our general guide is for them to try to exercise 30 minutes on non-dialysis days, with the ultimate goal of walking a mile in 30 minutes (though ...

We do a 6-minute walk, which is a very objective test and highly reproducible.