How long do blood cells live after being removed from the body?
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Without anticlotting agents or other preservation techniques, blood begins to clot and/or evaporate. Platelets are destroyed in the process of clot formation, but the red and white blood cells would probably survive until the liquid portion of the blood evaporated, which can take seconds to hours depending on the amount of blood and the surface area exposed to the air. In the case of slow evaporation, the remaining blood plasma becomes increasingly concentrated, drawing water out of the blood cells and killing them before the blood has dried completely.
http://www.aabb.org/AABBContent/Templates/AABBSub.aspx?NRMODE=Published&...{3A25F398-BFFA-4909-9257-B673AD063A2C}&NRORIGINALURL=%2fContent%2fAbout_Blood%2fFAQ%2fbloodfaq.htm&NRCACHEHINT=NoModifyGuest#a10
http://www.aabb.org/Content/About_Blood/Facts_About_Blood_and_Blood_Banking...
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/Clotting.html
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