Thanks for the replies everyone.
First things first I will wait for the results of the tests and go from there.
Even just getting testing done is proving a challenge. Normally the team doing the surgery would order the tests to be done, however because my sibling is looking at doing it overseas, I got sent to a doctor here with a list of things I have to ask to have tested. I was met with some baffled looks. Oh and CT scans etc are not covered either since we are requesting it ourselves. A quagmire indeed.
A little more information: During my conversations with my sibling I feel I gave quite a bit of food for thought. I brought up the society's stance on transplants in the past firstly. He(I'll just call this person he from now on) had never heard about this before so didn't believe it was true. Then I was asked "where I got the information? From the internet? Because that's apostate!" I said no look it up in the bound volumes. So he looked it up, and saw for himself. He said "well back then transplants weren't done successfully so it was actually for our own good." I said "is that reasoning they gave? No it wasn't. It was considered cannibalism. They said god did not permit it."
I then relayed Jesus words about wanting mercy not sacrifice. I made an illustration about putting more value in the symbol than what it symbolizes. He wears a wedding ring. I said "what does that symbolize? Marriage, would you agree?" "Yes" he replied. Then I said "what's more important, your wedding ring or your marriage? Would it make sense to sacrifice your marriage to save your wedding ring?" He had no reply.
I brought up the absurdity of blood fractions. I brought up 1975. The child molestation cases, the generation that would not pass away. Eerything I could think of to show that this is a religion that gives absolutely no reason for us to put our trust in it, especially when it comes to medical matters. His reply to all of this was that "There is a lot of things that don't make sense, but at the end of the day, what gods going to care about is whether or not we were faithful to him".
He is a very intelligent person. But simply will not let reason overcome blind devotion.