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Background  Over-testing of patients is a significant problem in clinical medicine that can be tackled by education. Clinical reasoning learning (CRL) is a potentially relevant method for teaching test ordering and interpretation. The feasibility might be improved by using an interactive whiteboard (IWB) during the CRL sessions to enhance student perceptions and behaviours around diagnostic tests. Overall, IWB/CRL could improve their skills.    Methods  Third-year undergraduate medical students enrolled in a vertically integrated curriculum were randomized into two groups before clinical placement in either a respiratory disease or respiratory physiology unit: IWB-based CRL plus clinical mentoring (IWB/CRL + CM:  n  = 40) or clinical mentoring only (CM-only:  n  = 40). Feasibility and learning outcomes were assessed. In addition, feedback via questionnaire of the IWB students and their classmates ( n  = 233) was compared.    Results  Analyses of the IWB/CRL sessions ( n  = 40, 27 paperboards) revealed that they met validated learning objectives. Students perceived IWB as useful and easy to use. After the IWB/CRL + CM sessions, students mentioned more hypothesis-based indications in a test ordering file ( p  <  0.001) and looked for more nonclinical signs directly on raw data tests ( p  <  0.01) compared with students in the CM-only group. Last, among students who attended pre- and post-assessments ( n  = 23), the number of diagnostic tests ordered did not change in the IWB/CRL + CM group (+ 7%; p = N.S), whereas it increased among CM-only students (+ 30%;  p  <  0.001). Test interpretability increased significantly in the IWB/CRL + CM group (from 4.7 to 37.2%;  p  <  0.01) but not significantly in the CM-only group (from 2.4 to 9.8%;  p  = 0.36).    Conclusions  Integrating IWB into CRL sessions is feasible to teach test ordering and interpretation to undergraduate students. Moreover, student feedback and prospective assessment suggested a positive impact of IWB/CRL sessions on students’ learning.

Interactive whiteboard use in clinical reasoning sessions to teach diagnostic test ordering and interpretation to undergraduate medical students