How long does donated blood stays in my body?
A former colleague of mine, Tutuzdad, did some great research on just this topic, and his answer is here: Google Answers – “Blood Regeneration In Humans” Two of the sites he references are as follows, with the first one pretty well answering your question. Indiana Wesleyan University – “About Blood” “After donating blood, the body replaces the fluid and white cells within 24 hours, and platelets and plasma proteins within 48-72 hours. The red blood cells are completely replaced in 4-6 weeks. Blood may be safely donated at 8 week intervals” Wikipedia – “Blood Transfusion” This latter article lists a variety of infectious diseases that could be communicated via an infusion of blood, so from that aspect, there might be some part of the “donated blood” that stays with a person for the rest
