[Halon]

I've done the opposite. I donated blood, they seperated the blood and the plasma, and pumped the plasma back into me. They did this twice, so the bag of blood they got from me was the same size as what they normally take, but twice the concentration of blood cells. It isn't painful. It's no more painfull then donating blood the normal way. Except they pump stuff back into you. It just feels a little cold going back in because it's been out of your body and getting all cold in the machine. I was really cold for about 2 hours after I donated though. It was the middle of summer, in Yuma Arizona, and I was driving around in the afternoon with my windows rolled up and the heat blasting. Other then that, wasn't that big of a deal.