IMPROVEDD Risk Score VTEVTE Risk ScoreLoading...Previous VTE?No0Yes+3Known thrombophilia?No0Yes+2Current lower-limb paralysis?No0Yes+2Current cancer?No0Yes+2Immobilized?No0Yes+1ICU/CCU stay?No0Yes+1Age > 60 years?No0Yes+1D-dimer ≥ 2x ULN?No0Yes+2适用指征洞见与注意事项