Compression classes
Medical compression stockings are divided into four different compression classes, differentiated according to the intensity of the resting pressure (the pressure that is applied to the leg when it is not moving). The compression classes are standardized on the basis of this level of resting pressure in the ankle area. However, not only resting pressure is decisive in determining the efficacy of the compression stockings but also the material which can vary in respect of stretchability and elasticity. For this reason there are stockings made of different materials in the different compression classes.
Compression class |
Compression class |
Compression in kPA |
Compression in mmHg |
I |
light |
2,4 to 2,8 |
18 to 21 |
II |
medium |
3,1 to 4,3 |
23 to 32 |
III |
strong |
4,5 to 6,1 |
34 to 46 |
IV |
very strong |
6,5 and greater |
49 and greater |
Who decides?
Which compression class and length the physician in the end decides on to treat his patient must be established on an individual basis. It in essence depends on the diagnostic findings and on the location of the disturbed drainage. A rigid classification of a compression class in response to a diagnosis makes little sense.
In order to ensure the compression stocking fits the patient’s leg, circumference and length must be exactly determined by specialist staff in a surgical supply store. There are measurement points that are precisely defined. For a 43 stocking, for example, there are set measurements. The size tables and leg measurements reveal whether the patient can be supplied with a standard product or whether he requires a made-to-measure version. The specialist dealer will provide the very best advice.