The communication of uncertainty in health: A scoping review

•Extant research focuses on uncertainty due to probability and scientific issues.•Few studies examine uncertainty derived from ambiguity or complexity.•The majority of studies focus on patient experience of uncertainty.•Research on providers’ experience with ambiguity and complexity is lacking.•Heterogeneous/imprecise language challenges growth towards a cohesive study of uncertainty. To conduct a scoping review of existing studies that examine communication strategies that address uncertainty in health and categorize them using the taxonomy of uncertainty. Relevant articles retrieved from ten databases were categorized according to the dimensions of the taxonomy of uncertainty, and study characteristics were extracted from each article. All articles (n = 63) explored uncertainty in the context of probabilistic risk and related to scientific issues (n = 63; 100%). The majority focused on complexity (n = 24; 38.1%) and uncertainty experienced by patients (n = 52; 82.5%). Most utilized quantitative methods (n = 46; 73.0%), hypothetical scenarios (n = 49; 77.8%), and focused on cancer (n = 20; 31.7%). Theory guided messages and study design in fewer than half (n = 27; 42.9%). Heterogeneity in terminology used to refer to different types of uncertainties preclude a unified research agenda on uncertainty communication. Research predominately focuses on probability as the source of uncertainty, uncertainties related to scientific issues, and uncertainty experienced by patients. Additional efforts are needed to understand providers’ experience of uncertainty, and to identify strategies to address ambiguity. Future studies should use consistent terminology to allow for coherence and advancement of uncertainty communication scholarship. Continued efforts to refine the existing taxonomy should be undertaken.