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Anonymous
>>454164 When you donate plasma, they spin the whole blood in a centrifuge to separate the plasma from everything else. They then put the rest back into your body. So the result is a slightly lower total blood volume, but the same amount of red and white blood cells as pre-donation. This allows you to donate plasma several times a week (instead of once every 6-8 weeks like whole blood), because the plasma regenerates a lot faster than the blood cells.
For the OP, I'm not a doctor, but since you're mostly just losing water and salts when you donate plasma, so long as you have a good meal and plenty of water, there shouldn't be too much of a difference. I'd be more worried about making sure the injection site doesn't get injured. Whenever I've donated whole blood or plasma, they've always warned me to avoid heavy lifting with the affected arm for 24 hours or so, to give the punctured vein time to heal.
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