<p>I’m planning on giving blood Friday, around noontime. I think it’ll be around 450 ccs, but maybe lower…and I have the SATs the very next day Saturday (which commonly begin around 8-8:30 AM). Do you guys think that giving blood could impair my abilities in any way?? I know blood volume replenishes itself apparently in 24 hours, and I wouldn’t be giving it a full day. Still, I know plenty of people who have given blood and by 2 hours （after much snacking and drinking) they seem relatively normal. I’m pretty robust and average weight so it’s not like I’m super frail or anything…</p>
<p>Next day should be absolutely fine as long as you eat lots of the right stuff in that time.</p>
<p>Do you have to give blood on Friday or can it be scheduled after the SAT?</p>
<p>what about the placebo effect.</p>
<p>@Yakisoba ^^ good point. If you’re dwelling on the fact that you have just given blood, it might effect you simply because you’re harping on it.</p>
<p>I’ve given blood before and I don’t think that it really matters. It would be one thing to take the SAT 1 hour after you give blood but since you have time to sleep and eat a lot, it looks like you’d be okay.</p>
<p>Blood volume is restored within about 24 hours by plasma, but that doesn’t mean you are back to normal. Your red blood cells take several weeks to get back to normal.</p>
<p>I took the ACT 25 hours into 30 Hour Famine (a fundraiser for world hunger where you don’t eat for 24 hours), so it can’t be worse than that!</p>