Read, and then follow the advice.
Hogwarts School of Grid-Down Medicine and Wizardry
Source: http://www.britannica.com/EBchecked/topic/69869/blood-transfusion
Let’s talk about why it’s good to know your blood type. If the grid is down, and you’re down and in need of a blood transfusion, it’s going to make life a whole lot easier and safer for everyone if you could communicate your blood type to your caregivers so they can match donor blood to your blood quickly. Furthermore, if something happens to someone you care about and he or she needs a transfusion, it’s going to make life much easier and safer for everyone if caregivers knew you were part of a walking blood bank[1] of people that could donate in a pinch.
To that end, if you haven’t be typed, here are the safest ways to go about it.
1. Donate blood with the Red Cross. They’ll type it for you and mail you a card with your blood type on it…
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