How much compression?

The pressure a stocking exerts is measured at the ankle in millimetres of mercury (mm Hg). Different compression ranges result from varying the knit design and elastomeric yarn type and denier. Compression hosiery in the UK could be classified in four groups: 1. Support Hosiery These garments generally provide an ankle pressure of less than 14mm Hg at the ankle. The packs are usually marked with the relevant compression value at the ankle, the higher the compression value the stronger the stocking. 2. Anti-Embolism Stockings These stockings were for the prevention of Deep Vein Thrombosis (DVT) whilst patients are in bed in hospital. They provide a pressure at the ankle of between 15-20 mm Hg. The garments are normally white in colour with an open or inspection toe. 3. Stockings Conforming to RAL-GZ 387 This specification originated in Germany and is the basis for all compression hosiery recognised by the Health Insurance Schemes in both Germany and Switzerland. For more than 30 years stockings of this type have been prescribed for their patients by Vascular Consultants in hospitals in the UK. The Compression Classes and the indications for use are:
I 18 – 21 Slight varicosity Oedema Varicose vein prevention during pregnancy
II 23 – 32 Pronounced varicosis Pronounced oedema Following sclerotherapy and varicose vein surgery Varicose veins during pregnancy Chronic venous insufficiency Prevention of leg ulcers
III 34 – 46 Severe varices with oedema Following sclerotherapy and varicose vein surgery Prevention of leg ulcer recurrence Severe Chronic venous insufficiency (CVI) Mild lymphoedema
IV 49 and higher Severe lymphoedema
* Millimetres of Mercury
4. Stockings Conforming to UK Drug Tariff Specification 40:
1 14-17 Superficial or early varicose veins Varicose veins during pregnancy
2 18 -24 Varicose veins of medium severity Venous ulcer treatment and prevention of recurrence Mild leg swelling Varicose veins during pregnancy
3 25-35 Gross varicose veins Severe venous insufficiency Gross leg swelling Venous ulcer treatment and prevention of recurrence
* Millimetres of Mercury
5. Contra-Indications Warnings and Precautions: Care should be taken to observe specific manufacturers contra indications warnings and precautions. In general these may include: Absolute contra-indications:
  • Arterial disease in the legs.
  • Severe heart disease.
  • Severe infections of the veins.
  • Allergy to compression stocking fabric.
Relative contra-indications:
  • Infections of the skin.
  • Loss of feeling in the legs.
  • Allergy to compression stocking fabric.
Further information is available in our Credalast Instructions for use leaflet:
Credalast Instructions for use Click here to download a PDF
The information on this site has been designed to show best practice and to guide with the latest advice. However, information contained on this site represents our views and is not meant to be a substitute for consultation with Health Care professionals.

Product Information


Click here for product information on the new Credalast Velvet circular knit made to measure stockings

Advisory information on this site is not intended as a substitute for the advice of a health care professional. Consumers should rely on the judgement of a health care professional for specific conditions. | Credenhill - Specialist Distributors of Compression Hosiery