Legal requirement to test and record blood group at birth for medical records

Many people don't know their blood group unless they need to for medical reasons or have given blood. In an emergency where someone needs a blood transfusion, blood has to be taken and tested. Valuable time and money is wasted in this process. Carrying a card (as diabetics do, for example) or accessing medical records with blood types recorded could save lives. A card could also be kept visible at home, as other medical emergency information often is, in case a medic/ambulance attends the home.