any changes in the victim's physiological parameters. If a record is maintained, the receiving hospital doctor can see a trauma score time series from the start of the incident, which may allow definitive treatment earlier. Reverse triage There are a number of concepts referred to as Reverse Triage, the first is concerned with the discharge of patients from hospital. This makes resources available within a healthcare or hospital for incoming patients. The second concept of Reverse Triage is utilised for certain conditions such as lightning injuries, where those appearing to be dead may be treated ahead of other patients. The third is the concept of treating the least injured, often to return them to functional capability. This approach originated in the military, where returning combatants to the theatre of war may lead to overall victory (and survivability). Reverse Triage - Early Discharge Usually, triage refers to prioritizing admission. A similar process can be applied to discharging patients early when the medical system is stressed. This process has been called "reverse triage". When a major wave of patients arrive to a hospital, such as immediately after a natural disaster, many hospital beds will be already occupied by regular non-critical patients. To accommodate a greater number of the new critical patients, the existing patients may be triaged, and those who will not need immediate care can be discharged until the surge has dissipated, for example through the establishment of temporary medical facilities in the region. Undertriage and overtriage Undertriage is underestimating the severity of an illness or injury. An example of this would be categorizing a Priority 1 (Immediate) patient as a Priority 2 (Delayed) or Priority 3 (Minimal). Historically, acceptable undertriage rates have been deemed 5% or less. Overtriage is the overestimating of the severity of an illness or injury. An example of this would be categorizing a Priority 3 (Minimal) patient as a Priority 2 (Delayed) or Priority 1 (Immediate). Acceptable overtriage rates have been typically up to 50% in an effort to avoid undertriage. Some studies suggest that overtriage is less likely to occur when triaging is performed by hospital medical teams, rather than paramedics or EMTs. Telephone triage In telephone triage, decision makers over the phone must effectively assess the patient's symptoms and provide directives based on the urgency. This should be done in a timely fashion while meeting standard guidelines in order to prevent symptoms from worsening.