How much blood can a human being lose?

I read about the cut in the neck that Richard Zednik had from a skate, and was wondering how much blood can a human being lose, and stay alive?

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Hi,
An adult human can lose 10-15% without clinical damage.  If one loses 30% it can be fatal (haermorraghic [shock due to loss of blood]).  An "average" adult male has some 5 litters of blood.  Sudden loss of 1/3 of his blood can be fatal.  However if the lose rate us slow (say: 24 hours) he can lose as much as 2/3 of the blood with much risk (well documented).  So it's not only the amount of blood that one is losing but, the rate one loses it.  It's also a matter of maintaining the blood pressure.
Best regards,

Love is the battery of life....

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