How much blood can a person lose before the loss becomes life threatening?
by 
wickedwillie
ANSWERS: 2
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Immediate effects depend on the duration and volume of hemorrhage. Sudden loss of 1/3 of blood volume may be fatal, but as much as 2/3 may be lost slowly over 24 h without such risk. http://www.merck.com/mrkshared/mmanual/section11/chapter127/127b.jsp
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You can lose more and get away with it if you totally relax if severely injured and you are losing lots of blood - if you know help is coming slow your breathing right down. Running around panicking speeds up the heart and raises the blood pressure. Movement also requires more oxygen than lying still. People have survived losing 6 out of 8 pints.
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