ToolsCalculators
IMPROVE Risk Score for Venous Thromboembolism (VTE)
Estimates 3-month VTE risk in hospitalized medical patients.
IMPROVE Risk Score for Venous Thromboembolism (VTE)
Previous VTE
Known thrombophilia
Current lower-limb paralysis
Current active cancer
Immobilized ≥7 days (current admission)
ICU or CCU stay
Age >60 years
Result0 points
Approximate 3-month symptomatic VTE risk ≈ 0.4 % in the derivation cohort.
- 3-month VTE risk
- ≈ 0.4 %
When to use
- Estimating VTE risk at admission in acutely ill hospitalized medical patients.
- Informing the decision to start pharmacologic VTE prophylaxis.
Formula
Points: previous VTE +3, known thrombophilia +2, current lower-limb paralysis +2, current cancer +2, immobilization ≥7 days +1, ICU/CCU stay +1, age >60 years +1. Range 0-12.
Pearls and pitfalls
- A score ≥2 was also associated with higher overall and VTE-related in-hospital mortality in the derivation cohort.