Call me crazy, but I'm one of those people who wants their medical information to be harder to get, not easier. I don't want any company to have it at all, including hospitals, etc. I'd prefer to come in with a thumb drive with medical information in a human readable format and that's it. Or you know, a folder with some papers in it.
I don't think I have any relevant allergies or anything, but if I did, I would want the hospital to have 100% instant access to every piece of data