by 
charlie
ANSWERS: 2
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I think it's about 6-8 weeks, which is why they don't let you give blood again until that time period has elapsed. Of course, it would depend on the person to some degree, we're all different.
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okay, i just found this, and it makes a ton more sense than 6-8 weeks; that is ridiculous. "Blood volume or plasma is replaced within 24 hours. Red cells need about 4 to 8 weeks for complete replacement." http://www.querycat.com/faq/9b83a606b9900b78f98332d4560ab4d1 i know that it doesn't take very long, like not even a day to replenish smaller amounts of blood, so this makes sense. i gave blood today, and i was feeling extremely dizzy, but now after like seven hours, i feel almost completely normal again.
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