How much blood could be bled out of a 14g needle at the elbow before becoming life threatening?

Question

I don't know the metric system too well so could you try not to use it. Thanks! Don't worry I'm not out to hurt myself.

Answer 1

If the needle is not in a closed system, like a blood donation bag, it will more than likely clot before it becomes life threatening. Some people can not even give a pint before clotting.

Answer 2

16 gallons

Answer 3

An adult has 10 pints of blood. You would have to lose between 3 1/2 and 4 pints before you would die.