Background: Occupational cancer is one of the most common occupational diseases. Identifying exposure to carcinogens is important both for implementing measures to prevent and control the risk of exposure and for the post-exposure medical surveillance of workers. The purpose of this study is to develop and validate a questionnaire that can be used in clinical practice to identify exposure and ultimately facilitate the diagnosis of occupational cancer. Methods: The first step involves designing the questionnaire, which will then be validated in the second step by ensuring it meets all the validation criteria for a questionnaire. Results: Scientific validation, logical validation, and construct validation were completed to ensure that the questionnaire is appropriate both structurally and in terms of content. The questionnaire was evaluated by comparing it to a reference standard, and the results, based on the exposure risk level category, showed good agreement (k = 0.719). The intra-observer and inter-observer reliability tests showed an excellent concordance for exposure risk level category (k = 1.000 and k = 0.945). Conclusions: The questionnaire was developed and validated to identify the risk of occupational cancer, and its systematic use in Romania could make a better selection of subjects who should be included in the post-exposure surveillance.
