Happiness often sneaks in through a door you didn't know you left open. -John Barrymore
Question #4539 posted on 03/27/2004 12:02 a.m.
Q:

Dear 100 Hour Board,
How much blood can the average human lose and still remain conscious? How much before they die (strictly from bloodloss, assuming no other injuries)?
- Mafia

A: Dear mafia:

Hopefully you aren't planning someone's demise through hypovolemia anytime soon. But if you are, here is how to go about executing your nefarious scheme. Shock from blood loss sets in when you've lost about 20% of your blood, which is around 3L for the average 160lb person. The death threshold is about 25% to 30% blood loss. And death is usually caused from lack of oxygen / carbon dioxide transport.

-- Misaneroth