I would treat it as dangerous medication--not something to do just to blow off the washtowel. (That is what Christmas is for.) Blood is quite expensive, and there are a million ways for compatibility issues to arise with a blood transfusion. Not to mention the real chance of getting AIDS or hepatitis C (which, unlike coronavirus, I do take seriously). And there are other options to take before resorting to blood.
First, I would rather try to prevent the incident in the first place. Sometimes all it takes is safety measures to not need any treatment at all. Next, I would rather see measures taken to reduce blood loss. Even if I ultimately need blood, it would likely be a smaller amount, and this means that much risk of compatibility problems or serious diseases. (And more left for others--this stuff is not available in unlimited quantities.) But, if push comes to shove, I would take whatever blood I still need.
Which is more than can be said about the coronavirus vaccine. I simply will not take that, since it would ruin my DNA forever, cause serious and permanent pain and suffering, and the benefits would be almost none.