I

20-30

Prevention of venous thrombosis, prophylaxis of thrombosis and varicose veins in pregnant patients, small varicose veins during pregnancy, complaints of heavy and tired legs, small varicose veins with no visible edema, postsurgical treatment of varicose veins

II

30-40

Large varicose veins during pregnancy, varicose veins with mild edema, history of superficial vein phlebitis, prior sclerotherapy of varicose veins, healed small ulcers

III

40-50

Very large varicose veins with significant edema, successfully healed large ulcers, posttraumatic edema, reversible lymphedema

IV

50-60

Severe postthrombotic syndrome, irreversible lymphedema

a Pressure at ankle level (mm Hg).