Thus, proven risk factors for DVT in the Indian population mainly include age, obesity, smoking, major surgery, trauma, prolonged bed rest/immobilization, pregnancy or puerperium, drugs (oral contraceptives, post-menstrual hormones), previous history of DVT, and some genetic factors (like antithrombin III, protein C and S deficiency) [6]. This evidence concerns the gene SERPINC1 and deep vein thrombosis.