1.She never travels without her own personal pack of blood.
There is always the queen’s medical practitioner among the people accompanying her on her trips. The doctor is responsible for knowing the location of all nearby hospitals in the cities that they visit. She also has to carry a bulky medical bag containing a mobile defibrillator and emergency medicine.
Apart from that, the doctor also has Queen Elizabeth’s personal pack of blood which will be used for a transfusion if necessary.