Investigations

Why?

A positive MRI scan makes a pulmonary embolism much more likely

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
suspected pulmonary embolism b (pre-test probability: 46%)	pulmonary embolism (angiography)	MRI	22 (3.2 to 150)	89%	0.0 (0.0 to 0.32)	0.0%