It goes on ice
The initial needle-poke part of donating blood is easy and typically takes less than 15 minutes. But before your blood can be used by someone else, it takes some surprising twists and turns, starting with getting iced: The blood donation center staff places your collection bag in a cooler with the others until the donations can be taken for testing and processing; note that the staff will also set aside a tube of your blood for additional testing. They do this with every donor.
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