Emergency Medicine Pulmonary Embolism Testing Multicentre Study

"Pulmonary embolism will be excluded during emergency department assessment by the combination of:~1. 'Pulmonary embolism is the most likely diagnosis' as per the treating physician AND a D-dimer result \< 500 ug/L fibrinogen equivalent units;~2. 'Pulmonary embolism is not the most likely diagnosis' AND D-dimer \< age-adjusted threshold; or,~3. A negative computed tomography scan, planar ventilation perfusion scan or ventilation perfusion-SPECT.~Emergency departments will use their local laboratory D-dimer assay."