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Why do nurses slap the arm before drawing blood?

Image Answers

How to Draw Blood from Hard to Hit Veins: 15 Steps (with ...
Source: wikihow.com

Further Research

How to Draw Blood
www.registerednursern.com

Nurse unable to draw blood
www.diabetes.co.uk

Raising a Vein: Slapping & Gravity
www.injectingadvice.com