Introduction: In EDs, triage ensures that patients whose condition requires immediate care are prioritized while reducing overcrowding. Previous studies have described the manifestation of caregivers' moral judgements of patients in EDs. The equal treatment of patients in clinical practice presents a major issue. Studying the impact of prejudice on clinical practice in the ED setting provides an opportunity to rethink clinical tools, organizations and future training needs. Our study sought to describe the moral judgements expressed by triage nurses during admission interviews in emergency departments and to assess their impact on patient management. Methods: An exploratory sequential mixed-method study was performed. The study was conducted between January 1, 2018, and February 18, 2018, in the EDs of three French hospitals. Five hundred and three patients and 79 triage nurses participated in the study. Audio recordings, observations and written handover reports made by nurses during admission triage interviews were analyzed with a view to discerning whether moral judgements were expressed in them. We studied the impact of moral judgements on patient management in the emergency department. Results: Abstract Moral judgements were made in 70% of the triage situations studied (n=351/503). They could be classified in seven categories. Patients were more likely to be subjected to moral judgements if they were over 75 years old, visibly disabled or if they had visible signs of alcohol intoxication. Being subjected to moral judgement was associated with differential treatment, including assignment of a triage score that differed from the theoretical triage score. Conclusion: More than two thirds of patients admitted to EDs were triaged using moral criteria. Patients who were morally judged at the admission interview were more likely to be treated differently.