The mostcommon disease in the worldwide that increases mortality and morbidity anddecreases patients’ quality of life is venous thromboembolism (VTE), whichincludes pulmonary embolism (PE) and deep venous thrombosis (DVT) 1. In US, thereis a high incidence of DVT and PE cases and patients’ death result fromone-third of VTE cases yearly 2. VTE prophylaxis is recommended inhospitalized patients to reduce incidence of VTE, the problem is it underusedamong half of these patients in many countries 3–6. VTE risk assessmentmodels (RAMs) are used to assess postsurgical patients’ risk factors andprophylactic therapies according to their weighted risk scores by summed themthen assign the risk level 7. RAMs havetwo methods, either individual risk assessment or group risk assessment. Thedata and studies showed that individual risk assessment is more effective andconcise 8–11. There are many individual VTE RAMs have been evaluated anddeveloped, the most common models are adapted by Caprini, Cohen, Kucher, etc 8–12.

Caprini riskassessment model is a combination of clinical experience with recent publisheddata and established in early 1990s by Joseph Caprini and then updated on 2005with new version. This new version is most common used and validated inworldwide for postsurgical patients to assess their risk prediction 13–16.  In addition, it can provide appropriateprophylaxis recommendations for each risk level and score which helpsphysicians to increase their practical and convenient work. Caprini riskassessment model is used in our institution (Ministry of National Guard-HealthAffairs – MNGHA) in postsurgical patients for almost a decay.   However, as far as we know, it has notbeen validated among hospitalized elective surgicalpatients in Saudi populations and in MNGHAinstitution. The specific objectives of thisstudy are to: (1) preliminarily assess the validityof Caprini risk assessment model among hospitalized elective surgical patientsin Saudi population, and (2) explore the link betweenindividual patient risk assigned by the Caprini model and the recurrence of VTEover the 12-month follow-up period after patients discharge.