If I had to wear a tag stating all my problems, such as use only right arm...by the way I have a port on my upper left side chest, am on warfarin, on oral chemo (Methotrexate Blah Blah Blah....it would be the size of a dustbin lid. For me, I reckon if I'm so out of it that I can't speak for myself to tell them which arm, that would be the least of my problems. I also think that if I'm that critical, the medical people won't be rifling through any bracelets or pendants looking for medical info. They would be looking for I.D. info in your wallet or purse, and that is where I have a laminated card stating briefly my condition.