Congrats on your brother being approved to donate
I can understanding him wanting a 3rd test to confirm his kidney function, its strange that the 2 tests came back so different, but certainly things can happen.
I'm just beginning the process to qualify for transplant, and my brother has volunteered to be tested. I keep trying to talk him out of it, but he's sure!! Bless his heart
Please keep us posted on your situation and I pray everything will work out.