3 Patient Triage and Transport Priority

Purpose and setting of triage

Triage is a repeated decision process: identify who needs care first, what care cannot wait, and where the patient should go. It is not a diagnosis. Decisions reflect the information available at the time and may change as the patient’s condition or available resources change.

In routine EMS care, the aim is to provide each patient appropriate care and transport. In a mass-casualty incident, triage instead helps direct scarce responders, equipment, and transport capacity toward the greatest overall benefit. These settings use different approaches. For example, the American College of Surgeons (ACS) field-trauma guideline supports individual destination decisions; it is not a mass-casualty triage method.

Follow local protocols, medical direction, scope of practice, and incident command. National guidelines can inform decisions but do not replace local destination rules or clinical judgment.

A rapid approach to assessment and priority

Use a rapid, repeatable sequence, adapting care to the patient and the resources available.

1. Check scene safety and the overall situation. Identify hazards, the number of patients, available help, and whether a mass-casualty plan is active. Request additional resources early when needed.

2. Look for immediate threats to life. Rapidly assess airway, breathing, circulation, major bleeding, level of consciousness, and other critical findings. Treat immediate threats within your training and protocol, while arranging prompt transport when indicated.

3. Assign a working priority. Consider how unstable the patient is, how quickly the patient could worsen, and whether a time-sensitive intervention or specialized facility is needed. Do not let one reassuring sign override a concerning overall picture.

4. Choose care and destination together. Stabilization and transport are not always separate steps. Provide essential care while preparing to move, then continue appropriate assessment and treatment en route. For serious trauma, consider physiology, injuries, mechanism, and patient-specific factors—not distance alone.

5. Reassess and reprioritize. Repeat the primary assessment, check vital signs and the main complaint, and confirm whether interventions are working. Worsening findings raise priority; improvement does not remove the need for monitoring or for following destination criteria.

Acuity and mass-casualty categories

In ordinary EMS or emergency-department care, Acuity describes the urgency of a patient’s needs. Labels and numbering vary among systems, so use the locally adopted scale. In general, priorities fall into these groups:

• Immediate or critical: An active or impending threat to life or limb, severe instability, or need for time-critical care. Begin appropriate lifesaving measures and prioritize rapid transport or immediate clinician assessment.

• Urgent or high acuity: Significant illness or injury that may deteriorate or needs timely evaluation, even if the patient is currently maintaining basic function.

• Lower acuity or routine: No current evidence of an immediate threat. Care can generally wait behind more urgent cases, with monitoring and reassessment.

Acuity is dynamic. A patient who initially appears lower acuity may become urgent if breathing worsens, mental status changes, bleeding continues, or new symptoms appear.

Routine priorities and disaster categories

Do not confuse routine acuity labels with disaster tags. In the SALT mass-casualty method, responders first globally sort patients, provide selected lifesaving interventions, and then categorize patients as immediate, delayed, minimal, expectant, or dead. “Expectant” reflects the likelihood of survival given injury severity and the resources available. It is specific to resource-constrained mass-casualty triage, not a routine label for an individual patient.

Reassessment and changing conditions

Reassessment is not a one-time step. Repeat it after an intervention, when the patient reports a change, during transport, and at the regular intervals required by local protocol. Compare each assessment with the patient’s earlier condition. Include mental status, airway and breathing, circulation and bleeding, vital signs, symptoms, and the effects of interventions.

A commonly taught EMS interval is at least every 5 minutes for unstable patients and every 15 minutes for stable patients. Local protocols may differ, and a changing condition calls for reassessment sooner.

If a patient deteriorates, return to the immediate-threat assessment, address priorities within scope, alert the receiving facility or medical control as appropriate, and reconsider transport priority and destination. In trauma, serious physiologic findings or major anatomic injuries generally indicate a higher-level trauma destination. Moderate-risk findings and special considerations may also affect destination. Apply current local trauma-system criteria rather than relying on mechanism alone.

Prioritizing limited resources

When several patients need help, prioritize by urgency, risk of deterioration, and the likely benefit of available care—not by who is loudest, easiest to reach, or first to ask. Make rapid initial classifications, address immediate threats that can be treated quickly, and repeat the sort as patients and resources change.

In a mass-casualty incident, use the designated incident command structure and triage system; do not simply apply routine one-patient priorities to the whole scene. In SALT-style global sorting, patients who are still or show an obvious life threat are assessed before those who can move purposefully or walk. Use the incident’s triage plan and reassess as conditions change.

Transport priority and destination

Match the destination to the patient’s likely needs and the receiving facility’s capability, while accounting for transport time, system capacity, and local rules. For injured patients, the ACS field-triage guideline is designed to identify those at high or moderate risk of serious injury and guide destination decisions. Its purpose includes avoiding Under-triage while limiting harmful Over-triage that can consume specialized capacity.

The closest facility is not automatically the most appropriate one. Transport to a more distant center must follow the local trauma system and protocol. For medical emergencies, use appropriate specialty and regional pathways when available—for example, a stroke-capable or cardiac-capable destination when criteria and local protocols indicate it.

If the patient is unstable, transport priority rises. Essential stabilization should not create avoidable delay. During handoff, communicate the patient’s status, changes, treatment, and the rationale for the destination.

Applying priorities in practice

Two patients and one crew

One patient has worsening breathing and new confusion; another has a painful but controlled wrist injury and normal mentation. The first patient receives immediate assessment and stabilization because airway, breathing, and mental-status changes suggest greater urgency. Reassess both as resources arrive.

Trauma destination

A patient seems conversational after a high-energy crash but has concerning physiologic or anatomic findings. Do not let the ability to talk reassure you into choosing a lower-level destination. Apply current field-triage criteria and local transport rules, and reassess during movement and en route.

Multiple casualties

Several people can walk, while one is motionless with an obvious life threat. Under SALT-style global sorting, assess the motionless patient and other obvious life threats before directing ambulatory patients to a safe area for later individual assessment. Follow the incident’s triage plan and reassess as conditions change.