Investigations

Combining with a whole blood agglutination d-dimer test makes IPG better at diagnosing and excluding DVT ^a

Why?

D-dimer and impedance plethysmography can diagnose and exclude DVT

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability
suspected DVT a (pre-test probability: 18%)	deep vein thrombosis (venogram, follow-up)	IPG+, d-dimer+	61 (19 to 190)	93%
		IPG+, d-dimer-	6.3 (1.4 to 27)	57%
		IPG-, d-dimer+	2.0 (1.3 to 3.0)	30%
		either test positive	2.3 (1.5 to 3.3)	33%
		IPG-, d-dimer-	0.070 (0.027 to 0.18)	1.5%