It sounds like you're doing everything you can.Yes. The kids and I have. Spouse was asked for a note from Nephrologist. No CKD and we ran a battery of other tests too & they all came back normal.
Our Nephrologist did give a note and we will go back to the Panel Physician in 2 weeks from now. In the meanwhile dietary and lifestyle changes have been made and we hope this too shall pass
Your spouse must pass the medical in order for the application to be approved. There is no way around that.