The diagnostic performance of the scores used to determine the pre-test probability in diagnosing pulmonary embolism does not present relevant differences with the diagnostic performance provided by the empirical assessment. On the basis of the evidence available, there cannot be established the superiority of the diagnostic performance of a specific score over the rest of them. 3 categories-Wells score and Geneva score have been studied the most. 3 categories-Wells score has proved high sensitivity (higher than 90%) in patients with moderate frequency of pulmonary embolism, but in patients with high frequency, sensitivity data did not match (between 66 and 91%). In good quality papers in which it has been assessed the accuracy of Geneva score in patients with high frequency of pulmonary embolism, sensitivity has proved to be high (over 86%). The studies on diagnostic performance found in this review have not assessed clinical effectiveness of the said scores in terms of health outcomes.