eli5 Do blood clinics test the blood before giving the donation to a patient?
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To add to what others have said: a blood donation is not only thoroughly tested, but also recieves a lot of processing. A “bloodbag” a patient recieves is far from the bag a donor donated.
The Plasma gets seperated off, the platelets get seperated, the white blood cells are removed and the plasma-free red blood cells get mixed with a nutrient solution.
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