After answering 'I don't know' so many times in Japan to that question I finally forked out the cash to get it read the other day.
AB+ desu. Cool, critical and indecisive. I'd love to tell you if this is true or not, but I can't decide. Don't be upset with me, cause I'll never forgive you.
So, that means I can receive any type of blood? Glad to know. Always thought that might be useful to know if I was bleeding to death... then again, I probably wouldn't be able to speak, let alone give medical advice. lol.
If you were in an ER, bleeding out, they will type and cross-match you to a donor supply anyway, because there are more proteins available to match, and a perfect match is much better than just matching AB and RH factor, although if it's needed, these are all that is critical for blood. For organ transplants, they must match more proteins to prevent rejection.