The compression description is based on the range of compression applied to the ankle within a fitting range. For example a 20-30 mmHg hosiery fitting an 8” to 9” ankle will apply no less than 20 mmHg at an 8” ankle and no more than 30 mmHg at 9” ankle. Note typical fitting chart for compression hosiery from one company. Note that for knee length circumferential measurements are measured at the ankle and mid-calf while length is measured from the proximal leg the posterior if you’re aspect of the heel. Measurements were added for full length as noted below. The pressure measurements known in figure 3 refers to the level of the ankle when ordering knee length or thigh length stockings.
The following are the US compression standards for hosiery:
• 15-20 mmHg – Improves circulation, reduce swelling, controversial treatment telangiectasia/varicosities
• 20-30 mmHg – Chronic venous insufficiency, Treatment/prevention of varicosities
• 30-40 mmHg – Treatment of chronic venous insufficiency and ulcers
• 40-50 mmHg – Treatment of chronic venous insufficiency and ulcers