This reminds me of that “MAS*H” episode where the racist soldier begs the doctors to not get any “Negro” blood for transfusion, so they gradually darken his skin just to mess with him.
Your best bet is pure synthetic blood with a few drops of spinach juice added for extra veganism. BTW, it is said that karma is stored in the blood; maybe if I drain out all my blood and transfuse with pure synthetic blood, my messy life might get better. 
Well, once it’s processed blood becomes a drug, so it would be like asking for vegan Versed. Hopefully I was able to educate her.
Apparently there are no well-accepted oxygen-carrying substitutes, although blood substitutes can help with volume loss.
Since Jehovah’s Witness neither donate or want to accept transfused blood, I wonder what happens if one needs a transfusion, plasma, or platelets? What if they’re unconscious when they’re brought to the hospital and can’t wave the doctor off?
Two options:
1.) They discover that their religious faith isn’t as strong as their desire to live, take the blood.
2.) They stick to their guns, and die.
Oh, they also kill their children that way.
Plus you only have to change it every 10,000 miles!
There was no need as ivylass already knew the answer. See the spoiler box in her second post.
Vegan blood? isn’t that just V-8 vegetable drink? (it’s the “blood” of vegetables)
Most commonly it seems to be option #3: the medical team works with the JW to provide supportive care short of transfusion, which often if not usually works out OK.
Exceptions include massive trauma, complex surgeries (possibly including organ transplantation*) and the like.
*JWs accept solid organ transplantation, and such procedures (including kidney and pancreas transplants) have been accomplished successfully without blood transfusions.
Way back in the early nineties, when I was writing for a business newspaper, I interviewed a man who’d developed a machine to perfuse a patient’s blood with oxygen, then recirculate it. One of the selling points he talked about was that it was acceptable to Jehovah’s Witnesses, as the only blood used was the patient’s own. Don’t know whatever happened with that, and now that I think about it, that wouldn’t solve the problem of replacing volume in the event of traumatic blood loss.
Which–by definition–makes it not a situation where “one needs a transfusion, plasma, or platelets.”