On the contrary. if I wanted to be a donor, instead of having to sign the donor portion of my health card—I might not have the card with me when I'm brought to the hospital—I would voluntarily go and have my name added to the registry. This way, instead of asking me if I am a homosexual, I would be asked if I have engaged any risky sexual behaviour. If everything checks out, I would ask to have my name added to the registry. Otherwise, I would not. This way, all people would voluntarily sign up to be donors, with full knowledge of the facts. No one would be the victim of discrimination.
Today, thanks to computer technology, setting up a registry would probably be a less expensive proposition that the gun registry and it just might be more effective. It could be a national registry.