Medical compression stockings are divided into four compression classes the higher the compression class the higher the pressure this is also known as resting pressure the pressure of the compression classes is given either in kpa kilopascal or mmhg millimetres of mercury. You wear compression stockings to improve blood flow in your legs compression stockings gently squeeze your legs to move blood up your legs this helps prevent leg swelling and to a lesser extent blood clots if you have varicose veins spider veins or have just had surgery your health care provider may prescribe compression stockings. There are many types of compression stockings available for purchase without a prescription particularly lower compression gradients however when you are wearing higher graduated pressure 30 40 mmhg 20 30 mmhg or 15 20 mmhg support hose you should talk to your health care provider to find out if they are a good choice for you
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