Aims: Patient-reported experience measures (PREMs) are highlighted as clinically relevant information to better understand and address what matters to patients. Furthermore, patients’ experiences of the colonoscopy procedure are important quality indicators according to the ESGE-guidelines (Kaminski et al. 2017). To ensure that significant experiences are measured, patients should be involved in creating the measurements. The aim was to develop a colonoscopy-specific PREM in co-production with patients.

Methods: A conceptual model based on a literature review and a qualitative interview study that illustrates patients' experiences of undergoing a colonoscopy formed the theoretical basis. To assess the degree to which the content of the items reflected the patients’ experiences content validity was performed in accordance with COSMIN criteria. The validity was tested through face validity with clinicians and cognitive interviews with patients. In addition, content validity index was calculated to investigate the relevance of the items.

Results: The conceptual model consisted of five dimensions entailing experiences related to health motivation, discomfort, information, care relationship and understanding. Theses five dimensions were conceptual defined and then generated into items. The colonoscopy-specific PREM was initially represented by a total of 61 items. After (a) face validity assessment, (b) content validity assessment and (c) content validity index 36 items remained which represent a colonoscopy-specific PREM covering the five dimensions.

Conclusions: Patients were involved in developing a colonoscopy-specific PREM which appears to contain experiences of importance for patient. Psychometric properties need to be evaluated further.