Hi,
I'm with Ross on this one. I don't think you need to be registered with a service. What you do need it a necklace or bracelet that spells out what you condition is, and what medication you take. You do not need to tell them the dose, and it would be a bad idea to have that engraved, since the dosage is likey to change.
Having been through an emergency myself, when the 911 EMT's arrived, they check your pulse, (Bracelet), and they also open your shirt to check your heart (Scar and necklace). When someone opens my shirt now, and sees the scar, they immediately have to realize I had some type of open heart surgery. The necklace tells the tale. Mechanical heart valve, Counmadin, Atenolol. Allergic to Penicillin. That's it.
I also have a medical card with details in my wallet, on my car visor, and on the side of the refrigerator at home for my wife to have quick access to.
You don't need to feel like a walking hospital patient with a tag on, get yourself a nice pice of jewelry that you would like to wear, just make sure that it does have a very visable medical symbol logo, I forget the name of it at the moment. ( heart / lung bypass issue) I posted on another thread of a site that does have some nice Medical jewlery that is attractive to wear.
Ross, quit procrastinating!!
Good luck,
Rob