In many hospitals a variety of triage systems are used by senior medical staff to identify likely length of stay (LOS) of acute medical admissions and thus facilitate a streamlined admission under either acute medicine or general internal medicine (GIM). The authors evaluated if senior nursing staff on the medical assessment unit could triage patients depending on their predicted LOS as accurately as consultant acute physicians. Each of 193 medical admissions were independently triaged by both groups to either acute medicine (<48 hours) or GIM (>48 hours) depending on predicted LOS. The accuracy of patient triage was identical for senior nursing staff and consultants (80.8% vs 81.9%), when 95% confidence intervals are taken into account. Nursing staff triaged patients a mean of 8.5 hours earlier than consultants. This study demonstrates that triage of acute medical admissions is a practical extension of the senior nursing role and has been successfully implemented, with accuracy of nursing triage (83.5%) being maintained in a repeat study 6 months later.