Italian guidelines require a 4-level in hospital triage based on an acuity scale measurement, but they don’t suggest common guidelines neither which triage models to adopt. Thus each hospital developed own triage guidelines based on consensus. But, to our knowledge, there aren’t data on the reliability and predictive validity of triage systems adopted by Italian Emergency Department. Also in the ED of Imola, a triage working group developed Guidelines on triage in 2001. In this study we measured the reliability and predictive validity of the Imola Triage Guidelines (LGTI).