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Table 1 Clinical probability (the Wells score) of pulmonary embolism

From: Capnometry in suspected pulmonary embolism with positive D-dimer in the field

Wells score*
Variable Points
Previous DVT or PE + 1.5
Recent surgery or immobilization + 1.5
Cancer + 1
Haemoptysis + 1
Heart rate > 100 beats/min + 1.5
Clinical signs of DVT + 3
Alternative diagnosis less likely than PE + 3
Clinical probability (3 levels) Total
Low 0-1
Intermediate 2-6
High > _7
Clinical probability (2 levels) Total
PE unlikely 0-4
PE likely > 4
  1. *Wells score [7].
  2. DVT = deep vein thrombosis; PE = pulmonary embolism.