en Pulmonary Disease Pulmonary Disease Original Research Original Research <p><strong>Background: </strong>The aim of the present study was to evaluate the utilization and diagnostic yields of CT pulmonary angiography (CTPA) using the Revised Geneva score and Wells&rsquo; criteria, in patients with suspected pulmonary embolism (PE).<br> <strong>&nbsp;&nbsp; Methods:</strong> One hundred and twelve adult patients underwent CTPA for suspected PE were participated in this study. The outcome was positive or negative CTPA for PE. Revised Geneva and Wells&rsquo; scores were calculated. The relationship between the results obtained from these two scores and the available risk factors were compared.<br> Descriptive analysis such as frequency and mean as well as analytical statistics including chi-square were done. The data analysis was performed using SPSS (v. 22).<br> <strong>&nbsp;&nbsp; Results:</strong> In this study, according to the Wells&rsquo; criteria calculated for the patients, 33.9% of the patients had low clinical, 56.3% intermediate and 9.8% high clinical probability. Among the 11 high clinical patients, 9(81.8%) were CTPA positive. Based on the revised Geneva score, 65 patients (58%) had low clinical, 36 (32.1%) intermediate and 11(9.8%) high clinical probability.&nbsp; Among the 11 high clinical patients, 8 were CTPA positive. Positive predictive value of the low clinical patients based on Wells&rsquo; criteria and the revised Geneva score was 18.4% and 30.8%, respectively. Also, positive predictive value for high clinical probability of Wells&rsquo; criteria and the revised Geneva score was 81.8% and 72.8% respectively.&nbsp;<br> <strong>&nbsp;&nbsp; Conclusion:</strong> Under/overuse of CTPA in diagnosing PTE is a common problem especially in university hospitals. It is possible to avoid unnecessary CTPA requests using scholarly investigations and more accurate clinical risk assessments.<br> &nbsp;<br> &nbsp;</p> Pulmonary Embolism, Pulmonary CT angiography, Wells’ score, Revised Geneva score 13 17 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-922-9&slc_lang=en&sid=1 Hanieh Raji dr.raji.h@gmail.com 200319475328460036514 200319475328460036514 No Air pollution and Respiratory Diseases Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. Seyed Ali Javad Moosavi dr_moosavi_pul@yahoo.com 200319475328460036515 200319475328460036515 No Faculty of Medicine, Iran University of Medical Sciences and Health Services, Tehran, Iran. Maryam Dastoorpoor mdastoorpour@yahoo.com 200319475328460036516 200319475328460036516 No Air pollution and Respiratory Diseases Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. Zahra Mohamadipour dr.raji.h@yahoo.com 200319475328460036517 200319475328460036517 No Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. Parvin Mousavi Ghanavati sp.mg90@yahoo.com 200319475328460036518 200319475328460036518 Yes Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.