Independent risk factors include Age ≥ 60 years Prior DVT or PE Cancer Anesthesia ≥ 2 hours Bed rest ≥ 4 days Male sex Hospital stay ≥ 2 days Sepsis Pregnancy or the postpartum state Central venous access Body mass index (BMI) > 40 The Caprini score is commonly used for DVT risk stratification and determination of the need for DVT prophylaxis in surgical patients (see table Risk Assessment for Thrombosis).