Triage

# Overview
Triage is a system of sorting patients according to need when resources are insufficient for all to be treated. The term comes from the French tri (meaning sort). There are two kinds: simple triage and advanced triage.

# Classification
Simple triage is used in a scene of mass casualty, in order to sort patients into those who need critical attention and immediate transport to the hospital and those with less serious injuries.  This step is required before transportation becomes available.  The categorization of patients based on the severity of their injuries can be aided with the use of printed triage tags or colored flagging.
In advanced triage, doctors may decide that some seriously injured people should not receive advanced care because they are unlikely to survive. Advanced care will be used on patients with less severe injuries. Because treatment is intentionally withheld from patients with certain injuries, Advanced triage has ethical implications. It is used to divert scarce resources away from patients with little chance of survival in order to increase the chances of survival of others who are more likely to survive.
In Western Europe, the criterion used for this category of patient is a trauma score of consistently at or below 3. This can be determined by using the triage Revised Trauma Score (TRTS), a medically validated scoring system incorporated in some triage cards.
The use of advanced triage may become necessary when medical professionals decide that the medical resources available are not sufficient to treat all the people who need help.  This has happened in disasters such as volcanoes, thunderstorms, and rail accidents.  In these cases some percentage of patients will die regardless of medical care because of the severity of their injuries. Others would live if given immediate medical care, but would die without it.
In this extreme case, any medical care given to people doomed to die can be considered to be care withdrawn from people who might live if they had been given it.  It becomes the task of the disaster medical authorities to put aside some victims, to avoid saving one life at the expense of several others.
Triage is now also applied in system development. Requirements and design options are triaged to avoid wasting effort on ideas that will obviously never succeed.

# Simple Triage and Rapid Treatment
S.T.A.R.T. (Simple Triage and Rapid Treatment) is a simple triage system that can be performed by lightly-trained lay and emergency personnel in emergencies.  
It is not intended to supersede or instruct medical personnel or techniques.  
It may serve as an instructive example, and has been (2003) taught to California emergency workers for use in earthquakes.  It was developed at Hoag Hospital in Newport Beach, California for use by emergency services  It has been field-proven in mass casualty incidents such as train wrecks and bus accidents, though it was developed for use by CERTs and firemen after earthquakes.
Triage separates the injured into four groups: The deceased who are beyond help, the injured who can be helped by immediate transportation, the injured whose transport can be delayed, and those with minor injuries, who need help less urgently. However these descriptive words are by no means standard and different regions use different designations.
In the UK and Europe, triage is similar to the USA, but the categories used are dead, those who are pronounced as such by a medically qualified person or paramedic who is legally qualified to pronounce death, the immediate category, who have a trauma score of 3 to 10 (RTS) and need immediate attention, the urgent category, who have a trauma score of 10 or 11 and can wait for a short time before transport to definitive medical attention, and delayed patients, who have a trauma score of 12 (maximum score) and can be delayed before transport from the scene.
A simplified but effective description of the S.T.A.R.T. is taught in the Israeli army to non-medical personnel: the injured who are lying on the ground silently should be prepared for immediate transportation, injured lying on the ground but screaming are injured whose transportation can be delayed, and the walking wounded need help less urgently. A non-medical personnel has no authority to tag an injured person as deceased.

# Simple Triage and Evacuation
Simple triage identifies which persons need advanced medical care.  
In the field, triage also sets priorities for evacuation to hospitals.  
In START, persons should be evacuated as follows:
- Deceased are left where they fell, covered if necessary; note that in S.T.A.R.T. a person is not triaged "deceased" unless they are not breathing and an effort to reposition their airway has been unsuccessful.
- Immediate or Priority 1 (red) evacuation by MEDEVAC if available or ambulance as they need advanced medical care at once or within 1 hour. These people are in critical condition and would die without immediate assistance.
- Delayed or Priority 2 (yellow) can have their medical evacuation delayed until all immediate persons have been transported. These people are in stable condition but require medical assistance.
- Minor or Priority 3 (green) are not evacuated until all immediate and delayed persons have been evacuated.  These will not need advanced medical care for at least several hours.  Continue to re-triage in case their condition worsens. These people are able to walk, and may only require bandages and antiseptic.
A popular Triage Tag is the Smart Tag with its unique folded design means that effective triage is quick and simple, but most importantly it allows casualties to be re-triaged without having to replace the tag. It has been adopted as the standard triage tag for New York, Connecticut, Philadelphia, Boston and Nevada.

# Advanced Triage
In advanced triage systems, secondary triage is typically implemented by paramedics, battlefield medical personnel or by skilled nurses in the emergency departments of hospitals during disasters, injured people are sorted into five categories.
If immediate treatment is successful, the patient may improve (although this may be temporary) and this improvement may allow the patient to be categorized to a lower priority in the short term. Triage should be a continuous process and categories should be checked regularly to ensure that the priority remains correct. A trauma score is invariably taken when the victim first comes into hospital and subsequent trauma scores taken to see any changes in the victim's physiological parameters. If a record is provided back in time, the receiving hospital doctor can see a historical trauma score going back in time to the incident. This should allow more definitive treatment to be carried out earlier than might otherwise be the case.
Note that this scale is more complex than simple triage.  
Medical professionals should refer to professional texts and training references when implementing advanced triage; this listing is only for a layman's understanding.
Some crippling injuries, even if not life-threatening, may be elevated in priority based on the available capabilities.  
During peacetime, most amputations may be triaged "Red" because surgical reattachment must take place within minuteseven though in all probability, the person will not die without a thumb or hand.

# Triage in France
In France, the triage in case of a disaster uses a four-level scale:
- DCD: decede (deceased), or urgence depassee (beyond urgency)
- UA: urgence absolue (absolute urgency)
- UR: urgence relative (relative urgency)
- UMP: urgence medico-psychologique (medical-psychological urgency) or implique (implied, i.e. lightly wounded or just psychologically shocked).
This triage is performed by a physician called medecin trieur (sorting medic). This triage is usually performed at the field hospital (PMAposte medical avance, i.e. forward medical post). The absolute urgencies are usually treated onsite (the PMA has an operating room) or evacuated to a hospital. The relative urgencies are just placed under watch, waiting for an evacuation. The involved are addressed to another structure called the CUMPCellule d'urgence medico-psychologique (medical-psychological urgency cell); this is a resting zone, with food and possibly temporary lodging, and a psychologist to take care of the brief reactive psychosis and avoid post-traumatic stress disorder.
In the emergency room of a hospital, the triage is performed by a physician called MAOmedecin d'accueil et d'orientation (reception and orientation physician), and a nurse called IOA infirmiere d'organisation et d'accueil (organisation and reception nurse). Some hospitals and SAMU organisations now use the "Cruciform" card referred to elsewhere.

# Triage in the UK
In the UK, the commonly used triage system is the Smart Incident Command System , taught on MIMMS (Major Incident Medical Management (and) Support). The Military of the United Kingdom|UK Armed Forces are also using this system on operations worldwide. This grades casualties from Priority 1 (most urgent) to Priority 4 (expectant, i.e. likely to die).
Another system is the Cruciform and Manchester triage.

# Triage in Canada
In the mid-1980s, The Victoria General Hospital, in Halifax, Nova Scotia, Canada, introduced paramedic triage in its Emergency Department. Unlike all other centres in North America that employ physician and primarily nurse triage models, this hospital began the practice of employing Primary Care level paramedics to perform triage upon entry to the Emergency Department. In 1997, following the amalgamation of two of the city's largest hospitals, the Emergency Department at the Victoria General closed. The paramedic triage system was moved to the city's only remaining adult emergency department, located at the New Halifax Infirmary. In 2006, a triage protocol on whom to exclude from treatment during a flu pandemic was written by a team of critical-care doctors at the behest of the Ontario government. The protocol was published in the Canadian Medical Association Journal.

# Triage in North Korea
During the food crisis of the early 1990s the People's republic of North Korea adapted a system of triage to allocate aid and food in order to ensure their military and high ranking cadres were allotted ample rations. This often left the population in the urban north in particular to scrounge for food or die.

# Reverse Triage
In addition to the standard practices of triage as mentioned above, there are conditions where sometimes the less wounded are treated in preference to the more severely wounded. This may arise in a situation such as war where the military setting may require soldiers be returned to combat as quickly as possible. Other possible scenarios where this could arise include situations where significant numbers of medical personnel are among the affected patients where it may be advantageous to ensure that they survive to continue providing care in the coming days especially if medical resources are already stretched.

# Alternative Care Facilities
Alternative Care Facilities (ACFs) are places that are setup for the care of large numbers of patients, or are places that could be so set up.  Examples include schools, sports stadiums, and large camps that can be prepared and used for the care, feeding, and holding of large numbers of victims of a mass casualty event.

# Related Chapters
- Battlefield medicine
- Combat stress reaction
- First aid
- Mass decontamination
- Wilderness first aid