@mtbiker, Welcome to Connect. I am glad that you have joined and that you have already met @rebekahinvt and that she was able to provide you with the specific information that you were looking for.

Since you mentioned that you are being screened to be a donor, I have another discussion that you will want to visit -
From a Living Donor: One year later, what is your life like now?
https://connect.mayoclinic.org/discussion/a-post-donation-check-in-one-year-later/
We hope that you will share your donor experience with us on Connect. Especially your return to endurance events.