Table 3.

Risk categories for the occurrence of thromboembolic events.

Risk	Risk category
Low	Age over 40 years, obesity, inflammatory disease, recent minor surgery (within three days)
Moderate	Varicose veins, decompensated heart failure, recent acute myocardial infarction (within six weeks), hormone therapy (including contraceptives), pregnancy or the postpartum period, lower limb hemiparesis, lower limb trauma (within six weeks)
High	Previous venous thromboembolism, known thrombophilia, recent major surgery (within six weeks), prior stroke, cancer, family history of venous thromboembolism.