The average adult has a circulating blood volume of approximately 70 ml / kg of ideal body weight. Thus the average 70 kg male has approximately 5000 ml, or 5 liters of circulating blood). The loss of one liter in an adult, or about half a liter in a child, is considered to be very dangerous. Loss of 10-15% of total blood volume can be endured before significant risk. To recover such a loss, the human body generates blood at a rate of about 2 liters per week.
I have about 3.5 liters. This means I would be able to survive losing about a third to a half of a liter (no wonder I was so debilitated when donating a pint). This subsequently means that I should be careful not to bleed a lot, or give blood again anytime soon.
Just a note to self.
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