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I don't know a thing about giving blood, but I would hope that they test it for diseases and don't just take the word of the people donating. Don't they? Anybody could lie or not know.
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They do test blood for diseases, especially for HIV and hepetitis.
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I seem to recall that when you go to give blood, they do a quick test on you first, to make sure your blood is normal. Don't they still do that?
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Yes, they do, but in this case "normal" = "non-anemic." You can't donate blood if you're anemic; their theory is that if you don't have enough red cells for your own body, you shouldn't be siphoning off for others.
Check out the
blood-specific portion of the
Red Cross's website.