The rapid triage and treatment system for paediatrics (RETTS-p) has been used by the emergency medical services (EMS) in the west of Sweden since 2014. The performance of the RETTS-p in the pre-hospital setting and the agreement between the EMS nurse’s field assessment and the hospital diagnosis is unknown. | The performance of the EMS triage (RETTSp) and the agreement between the field assessment and final hospital diagnosis: A prospective observational study among children