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Risk factors for DVT/PE in SVT.
| Obesity | Age > 75 years, male sex |
| Trauma | Active cancer |
| Hypercoagulable states | Inpatient status |
| Use of oral contraceptives or hormonal therapies | Antithrombin, protein C, and protein S deficiency |
| Previous DVT/PE | Factor V Leiden |
| Infusion of endothelium-damaging substances | Autoimmune diseases |
| Pregnancy | SVT on non-varicose veins |
