The conversation between human and AI assistant.
Why is a tourniquet necessary when drawing blood?
Can you explain to me why a tourniquet is necessary when drawing blood?
Yes, of course! A tourniquet is placed around the arm above the area where the blood will be drawn. It helps to make the vein more visible and easier to access. Additionally, the pressure from the tourniquet temporarily slows the flow of blood to the arm which can create a fuller vein and makes it easier to obtain a blood sample.