Hi Suzie, I'm fine, glad to hear you've sorted things out - I was worried about you. I had been looking out for you to check you were ok, but I never caught up with you. Feel free to gimme a shout if you ever want to talk. I don't know if they would take your blood or not - I know they check what medications you are on and sometimes refuse you on those grounds.
As far as saying medics would make decisions based on organ needs, this is complete rubbish (not you Suzie, it was mentioned by R1 Geezer). Having gone through the proccess involved to be a live donor I know how strict the ethics involved are. I had the tests spread out over a year to give me the option of backing out. I had a lengthy interview with a psychiatrist to make sure I was aware of what I was getting into as well as a barage of medical tests to make sure I was physically fit and healthy enough to donate and if things had continued I was to go before an ethics committee with sworn statements from family and friends and evidence to prove I had an ongoing relationship with the potential recipient and that I was not being coerced or rewarded in any way. If they were that desperate and underhanded that they would let people die in ambulances just for spare parts, then I doubt they would have bothered going through all of that with me - it would've been one less person on the waiting list so they'd just have gone ahead.