Table 3.

Greenfield score < 5: low risk, >  = 5: high risk

Predictor		Greenfield Points
Age (years)	40–59	2
	60–74	3
	≥ 75	4
Obesity		2
Malignancy		2
Coagulopathy		2
History of TE		3
Femoral CVC > 24 h		2
Blood transfusions (> 4U in 24 h)		2
Surgery > 2 h		2
Vascular surgery		3
AIS chest/abdomen/head > 2		2 each
GCS < 8 for > 4 h		3
Complex lower extremities fracture		3
Pelvic fracture		4
Spinal cord injury with para- or quadriplegia		4