Clinical features

Ask which leg is affected: a DVT is less likely if the right leg is affected clinically. ^a

In pregnancy a DVT is less likely if the right leg is clinically affected

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability
suspected DVT in pregnancy a (pre-test probability: 42%)	deep vein thrombosis (serial impedance plethysmography)	left leg affected clinically	1.4 (1.0 to 1.8)	49%
		right leg affected clinically	0.23 (0.075 to 0.73)	14%
		both legs affected clinically	infinity (0.15 to infinity)	100%