Dead is a fourth classification and is important to prevent the expenditure of limited resources on those who are beyond help. P3 or T3: delayed care - needs medical treatment but this can safely be delayed.P2 or T2: intermediate or urgent care needed - requires significant intervention within two to four hours.Priority 1 (P1) or Triage 1 (T1): immediate care needed - requires immediate life-saving intervention.The following is one example of triage sieve which is used in the UK : Priority is then given to patients most likely to deteriorate clinically and triage takes account of vital signs, pre-hospital clinical course, mechanism of injury and other medical conditions.Triage is a dynamic process and patients should be reassessed frequently. *A growing body of evidence indicates the need to reconsider the routine use of cervical collars and rigid backboards in pre-hospital trauma care. Exposure or undressing of the patient while also protecting the patient from hypothermia.Circulation (including the control of external haemorrhage).Airway control with stabilisation of the cervical spine*.The primary survey aims to identify and immediately treat life-threatening injuries and is based on the 'ABCDE' resuscitation system: Triage is repeated prior to transport away from the scene and again at the receiving hospital. Primary triage is carried out at the scene of an accident and secondary triage at the casualty clearing station at the site of a major incident. Trauma triage is the use of trauma assessment for prioritising of patients for treatment or transport according to their severity of injury. For advanced adult trauma life support (ATLS), see the separate Trauma Assessment article.
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