Investigations

• Avoid I-125 fibrinogen leg scanning - it cannot safely diagnose or exclude DVT  ^c

Fibrinogen leg scanning cannot diagnose or exclude DVT

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
suspected DVT b (pre-test probability: 30%)	deep vein thrombosis (venography)	I-125 fibrinogen leg scanning	3.2  (1.8 to 5.5)	57%	0.63 (0.48 to 0.84)	21%