As I understand it if you get into an accident or something and need blood they test your type anyway regardless of anything you carry saying what it is. I know mine from when I used to give blood and I'd still give blood regularly if I could.
I think Iíve the common O positive. I donít carry a note about it in my handbag, because Iím always changing handbags, but itís on my blood donor card. I recently donated my 100th pint of blood. I started donating as a teenager. Yes I would give more blood if I was asked too, but 1 is only allowed to donate every 10 weeks.I pint of blood does save 3 lives.
I know it, but I don't keep a record. In the event of an accident where you need blood they test you anyway since they need to know more than just the type, and I don't think they can legally rely on the cards that say your type in case they are wrong.