TABLE 4.

Modified IMPROVE VTE (MIV) risk score. ¹⁰³

VTE risk factor	VTE risk score
Previous VTE	3
Known thrombophillia a	2
Current lower limb paralysis or paresis b	2
History of malignancy c	2
ICU/CCU admission	1
Complete immobilization d  ≥1 day	1
Age ≥ 60 years	1

Abbreviations: CCU, cardiac care unit; ICU, intensive care unit; IMPROVE, International Medical Prevention Registry on Venous Thromboembolism; NIH, National Institutes of Health; VTE, venous thromboembolism.

^a A congenital or acquired condition that causes the risk of excessive thrombosis (e.g., factor C/S deficiency, lupus anticoagulant, and Leiden Factor V).

^b Feet falls into bed 5 s but has an effort against gravity (taken from the NIH stroke scale).

^c Malignancy (not including non‐melanoma skin cancer) at any time in the past 5 years (malignancy must be in remission to meet eligibility criteria).

^d Immobilization is limited to beds or chairs with or without bathroom privileges.