Estimate PE pre-test probability using the revised Geneva score (all objective criteria): age > 65: 1; prior DVT/PE: 3; surgery or fracture in 1 month: 2; active malignancy: 2; unilateral leg pain: 3; haemoptysis: 2; HR 75-94: 3; HR >= 95: 5; pain on deep palpation + unilateral oedema: 4. Low 0-3, intermediate 4-10, high >= 11.
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