ELI5. How do blood transfusions work?

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A family member is getting one next week. I know im looking at it wrong, but if you have 8 pints of blood and they add in more where does the extra blood go? Or do they take some out first?

Tia

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5 Answers

Anonymous 0 Comments

So people tend to think of blood as a unique thing in and of itself, but really “blood” is just water with a bunch of blood components in it. The amount of “blood” you have fluctuates with the amount of water you have in your system. Our bodies can account for that. Most of the blood in our bodies is sitting in our veins. Roughly 70% of our blood is in our veins at any given time. That number will increase and decrease as you get more or less hydrated. Adding a pint of blood is really no different than drinking a pint of water.

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