[Triage: a key tool in emergency care].

"Triage" is a process that enables us to manage clinical risk in order to safely and suitably handle patient flows when demand and clinical needs exceed resources. At present, triage systems that are employed are structured according to five levels of priority. Levels are allocated according to the concept that what is urgent is not always serious and that what is serious is not always urgent. This makes it possible to classify patients according to "degree of urgency", so that the more urgent patients will be attended to first and the rest will be re-evaluated until they are seen by the doctor. The Spanish triage system (SET) and the Manchester triage system (MTS) are the two standardised systems most implemented in our country. We also discuss the system of triage devised in Navarre--integrated in the computerised clinical history--and used in the hospital network of Navarre. All are multidisciplinary systems based on the reasons and urgency of consultation, but not on diagnoses, and are carried out by nursing staff with medical support when required. In addition, they all include monitoring of the quality of the accident and emergency service itself, and can be applied in the outpatient field.