know what their blood group is?.
I ask this because I was given a card before my son was born in 1950 saying that if ever I attended the hospital to show the card because I have a rare blood group. Found it among old documents yesterday. Needless to say it will be thrown out after all these years.
I have never taken the card with me for many years because in this day and age they have a patients details on computer with an NHS number.
Curiosity makes me ask.