Table 2.

The IMPROVE VTE RAM *.

VTE Risk Factor	Points for the Risk Score
Previous VTE	3
Thrombophilia **	2
Current lower limb paralysis or paresis ***	2
Cancer ****	2
Immobilization *****	1
ICU/CCU stay	1
Age > 60 years	1

Abbreviations: IMPROVE, International Medical Prevention Registry on Venous Thromboembolism; VTE, venous thromboembolism; RAM, risk assessment model; ICU, intensive care unit; CCU, coronary care unit. * A score of 0–1 constitutes low VTE risk; a score of 2–3 constitutes moderate VTE risk; a score of 4 or more constitutes high VTE risk. ** A congenital or acquired condition leading to an excess risk of thrombosis. *** Leg falls to bed by 5 s, but has some effort against gravity (from NIH stroke scale). **** May include active cancer (excluding non-melanoma skin cancer) or a history of cancer within 5 years. ***** Strict definition is complete immobilization confined to bed or chair ≥7 days; modified definition is complete immobilization with or without bathroom privileges ≥1 day.