Aim: Intensified healthcare specialization has increased the need for patient transfers. We aimed to describe in-hospital and interhospital patient transfer decisions during the traumatic brain injury (TBI) trajectory from a nursing perspective. Design: Ethnographic fieldwork. Methods: We used participant observation and interviews at three sites representing the acute, subacute and stable stages of the TBI trajectory. Deductive analysis was applied supported by transition theory. Results: During the acute stage (neurointensive care), transfer decisions were facilitated by physicians assisted by critical care nurses, in the subacute stage (highly specialized rehabilitation), transfer decisions were collaborative among in-house healthcare professionals, community staff and family, and during the stable stage (municipal rehabilitation), transfer decisions were made by non-clinical staff. Most of the resources allocated during the trajectory went towards highly specialized rehabilitation, whereas more resources are needed during the end of the trajectory. No Patient or Public Contribution: Patients and the public were not involved in this study.