Most people who develop a DVT are advised to wear support stockings, or blood clot socks. This treatment has been shown to greatly reduce the risk of recurrent DVT and may also reduce the risk of post-thrombotic syndrome. 20-30 mmHg (firm compression). This is the most frequently prescribed compression level. These are beneficial for venous thrombosis prevention during extended travel, relief from moderate to severe varicose veins and swelling, lymphedema, venous insufficiency, superficial thrombophlebitis.