Congratulations on your interest in possibly becoming a non-directed kidney donor. Keep getting yourself well informed, including about the short-term and long-term risks involved. I donated non-directed 13 years ago and do not regret it. Here's some info:
--- The methods of preserving a donated kidney have been greatly improved, so it can be possible to donate at a hospital near you and for the kidney to be safely flown anyplace for implantation, if you wish.
--- It might be wise to first get a check-up from your regular doctor and ask his/her opinion regarding kidney donation. That way you start off with completely unbiased advice. Keep copies of all medical records and tests.
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www.kidneyregistry.org would try to match you with a recipient who has a willing but incompatible donor. You donate to that person, and then that person's incompatible donor gives to someone else. Again the "someone else" chosen is another patient with a wiling but incompatible donor who then passes a kidney along. The original non-directed donor thus starts a chain of many otherwise impossible transplants.
--- If you would prerfer to donate to a stranger but at the same time have a choice in who the recipient would be you might want to look at
www.facebook.com/WantedKidneyDonor which is one example of the patients who are personally seeking a donor.
best wishes,
Fr. Pat