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[–] SteelKidney 0 points 1 point (+1|-0) ago 

The more routine, the less likely. Go in for an annual physical, which usually involved bloodwork, and it's likely to get destroyed. Like @Mixplate said, there's literally no room to store that much blood.

On the other hand, if there's a reason to, then yes. Not a medical professional, so I'm just guessing, but I'd expect that if there's something wrong with you that's a good deal less common then your blood is going to get stored and make the rounds through different departments. Possibly even different organizations such as the WHO. Not the band. :)

All that said, your blood is almost certainly destroyed when no longer needed.