Triage
Sorting patients by urgency to allocate scarce care resources, originating in military medicine.
Triage is the systematic sorting of patients by urgency of medical need to allocate scarce care resources, originating in Napoleonic military medicine and substantially developed across military and civilian healthcare contexts. The term and practice are typically attributed to Dominique Jean Larrey (Napoleon's chief surgeon), who substantially developed battlefield medical triage during Napoleonic Wars (early 19th century), prioritizing soldiers based on urgency rather than rank — substantial innovation against earlier practice of treating officers first. Subsequent development includes: WWI and WWII substantial expansion of triage in mass-casualty contexts; civilian emergency medicine adoption from the 1960s onward; START (Simple Triage and Rapid Treatment) developed in 1980s for mass-casualty incidents; emergency-department triage scales (Australasian Triage Scale, Canadian Triage and Acuity Scale, Emergency Severity Index, Manchester Triage System); pandemic and crisis triage frameworks (substantially developed during COVID-19 pandemic for ICU and ventilator allocation). Triage typically involves sorting patients into categories based on urgency: in mass-casualty triage, typical categories include immediate (need urgent treatment to survive), delayed (can wait, will benefit from later treatment), minor (can wait substantially without harm), and expectant (unlikely to survive even with treatment, deprioritized to allocate resources to those who can be saved). Civilian emergency-department triage typically uses 5-level scales from immediate-life-threat to non-urgent. The technique involves substantial ethical complexity — utilitarian reasoning (maximize benefit from limited resources) can conflict with deontological commitments (each patient has equal moral worth) and with first-come-first-served fairness. Crisis triage during COVID-19 pandemic generated substantial bioethics debate about ICU and ventilator allocation criteria, with concerns about discrimination based on age, disability, or other characteristics. Triage's effective application depends on training, clear criteria, and substantial ethical consideration of allocation principles.
Core components
- Systematic sorting by urgency to allocate scarce resources
- Mass-casualty categories: immediate, delayed, minor, expectant
- Civilian ED triage scales (Australasian, Canadian, Emergency Severity Index, Manchester)
- Crisis triage frameworks for pandemic and disaster contexts
- Connection to broader resource-allocation ethics
- Foundation in Napoleonic military medicine
- Distinction from first-come-first-served allocation
- Tension between utilitarian and deontological considerations
- Substantial COVID-19 pandemic triage debate
Primary use case
Foundational technique across emergency medicine, military medicine, mass-casualty response, pandemic response; basis for emergency-department workflow globally; reference framework in emergency-medicine and disaster-medicine education; foundation for crisis standards of care; integration with broader healthcare-resource allocation; pedagogical foundation in emergency-medicine and military-medicine curricula; influence on disaster-preparedness planning; foundation for some commercial triage decision-support tools.
Common criticisms
- Substantial ethical complexity — utilitarian triage can conflict with deontological commitments and produce discrimination concerns
- COVID-19 pandemic triage debates documented concerns about: age-based criteria potentially discriminating against older adults
- disability-based criteria potentially discriminating against people with disabilities
- criteria for ICU allocation that produce discrimination by race, ethnicity, or socioeconomic status
- under-triage (not recognizing serious illness) and over-triage (treating non-urgent as urgent) both produce harm — emergency-department triage produces substantial both error types
- commercial triage decision-support tools have produced mixed results, with concerns about over-reliance and deskilling
- integration with mental-health emergencies, substance-use issues, and complex social factors is genuinely difficult — traditional triage scales were developed for traditional medical emergencies
- cross-cultural variation in symptom presentation affects triage accuracy
- tendency for crowding and resource constraints to produce triage that's substantially compromised by available resources rather than substantively prioritizing by need
- the technique's military origins shape commitments that don't always fit civilian healthcare
- pandemic crisis triage has substantial empirical and ethical questions remaining unresolved despite substantial COVID-19 experience
- triage decisions are often made under substantial time pressure with substantial uncertainty, complicating quality control
- integration with patient and family preferences is often weak — triage decisions are typically made unilaterally by clinical staff.