Assess pre-test probability for PE using Wells score. Clinical DVT signs: 3 pts; PE more likely than alternative: 3 pts; HR > 100: 1.5; immobilisation >= 3 days or surgery in 4 weeks: 1.5; prior DVT/PE: 1.5; haemoptysis: 1; malignancy: 1. Score <= 4 = PE unlikely; > 4 = PE likely.
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