How do you apply the tourniquet in performing a blood draw?

A tourniquet should be at least 4cm wide to prevent localised damage to nerves tissues. A tourniquet must be put on sufficiently tight to stop the bleeding. If it is not tight enough it can actually end up increasing blood loss. It may be necessary to apply more than one tourniquet to completely stop bleeding. It should also be roughly 4-5 cm from the draw point.

Explanation:

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