Medical-Surgical Nursing · Emergency Care

Triage and Assessment

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On this page 9 sections

In 30 seconds
Why this matters
The college version
Eli explains
Worked example
Key takeaway
Check yourself
Study tools
Sources & references

In 30 seconds

(from the French trier, "to sort") is the process of sorting patients by the urgency of their need for care when demand exceeds capacity — deciding who can wait and who cannot. Assessment in emergency care is the rapid, systematic evaluation that supports that decision: first a fast scan for life threats, then a focused history and exam to understand what is wrong. The two go together: triage is only as good as the assessment behind it, and assessment is only useful if it changes priorities in real time.

A common misunderstanding is that triage is a label a patient gets once at the front desk. In reality, triage is a dynamic process that continues for as long as the patient is in the emergency department (ED). People deteriorate; a patient who was stable at 9:00 AM can be in trouble by 9:30. The nurse's job is to keep reassessing and re-sorting — never to assume that yesterday's (or last hour's) priority is still correct.

Why this matters

Life-and-death ordering: In a busy ED, who gets seen first is decided by triage. Getting that wrong — sending a person having a heart attack to wait behind someone with a sprained ankle — is a preventable harm.
Every nurse does triage: Prioritization is not an ED-only skill. Medical-surgical nurses triage every shift when they decide which patient to see first, which call to answer, and whose deterioration to escalate. Exam questions about "which patient should the nurse see first" are triage questions in disguise.
Patient safety: A structured (ABCDE) ensures life threats are found and treated in order, not discovered by accident halfway through a long workup.
Team communication: Triage findings drive handoffs, provider assignments, and resource decisions. Clear, time-stamped documentation protects both the patient and the nurse.

The college version

Core Concepts

What triage is — and is not

Triage sorts by (how urgently the patient needs care), not by arrival order, not by who is loudest, and not by who looks most impressive. It is also not a diagnosis: the triage nurse identifies urgency, while the provider determines the diagnosis. The triage decision balances two questions: "Is this patient in immediate danger?" and "What resources will this patient need?" A person with crushing chest pain and a person with a gaping wound may both need rapid care, but for different reasons.

Common triage systems

: a five-level triage tool used widely in EDs. Level 1 patients need immediate, life-saving intervention (for example, a person who is not breathing adequately); Level 2 patients are high risk, confused/lethargic, in severe pain or distress, or in a situation where waiting would be dangerous; Levels 3–5 represent decreasing urgency, with Level 3 patients who need multiple resources, Level 4 needing one resource, and Level 5 needing none. ESI is a framework, not a legal rule — the exact version, name, and application vary by facility, region, and protocol.

Disaster triage: in a mass-casualty event (a bus crash, an earthquake), the goal shifts from "best care for each individual" to "the greatest good for the greatest number." Simple systems like START use color tags — for example, red for immediate, yellow for delayed, green for minor/walking wounded, and black for those so badly injured that limited resources are directed elsewhere. This inverts everyday priorities: the most critically injured are not always treated first, because saving them would consume resources needed to save many others. Disaster triage is a team effort under incident command, and local protocols always apply.

The primary survey: ABCDE

The primary survey is a rapid, systematic scan for immediate life threats, performed in a fixed order:

A — Airway: Is the airway open and protected? (Listen for breath sounds, look for obstruction, check for the ability to speak.)
B — Breathing: Is the patient breathing adequately? (Rate, depth, work of breathing, oxygen saturation.)
C — Circulation: Is there a pulse and adequate perfusion? (Pulse, skin color and temperature, capillary refill, bleeding.)
D — Disability: Neurological status — level of consciousness, pupils, movement, blood glucose in the appropriate context.
E — Exposure: Remove clothing as needed to find hidden injuries, while protecting the patient's dignity and preventing hypothermia.

The discipline of ABCDE is that you treat life threats as you find them — you do not finish a full head-to-toe before starting to fix a blocked airway. The primary survey can be repeated; in a deteriorating patient it often must be.

Focused assessment, history, and reassessment

Once life threats are managed, the gathers the story: the chief complaint, a symptom history (mnemonics like OPQRST — Onset, Provocation/palliation, Quality, Region/radiation, Severity, Timing — for pain, or SAMPLE — Signs/symptoms, Allergies, Medications, Past medical history, Last meal, Events — for general history), vital signs, and a focused physical exam of the relevant systems. These mnemonics are tools to organize questions, not scripts to recite mechanically.

The most commonly missed step is . Triage levels, vital signs, and mental status must be rechecked at intervals and whenever the patient's condition changes. A feverish child who becomes lethargic in the waiting room is no longer a Level 4 — and the nurse who rechecks is the one who catches it.

Documentation and communication

Triage documentation should be time-stamped, factual, and specific: "arrived by ambulance at 14:10, reports crushing chest pain radiating to left arm, diaphoretic, SpO2 94% on room air" — not "patient seems sick." Handoffs use structured tools like (Situation, Background, Assessment, Recommendation) so that urgency travels with the patient from triage to treatment room to admitting unit. Safety concerns (falls risk, violence risk, isolation needs) must be flagged in the handoff, not discovered by the next nurse.

Common Confusions

Do not confuse	With	Difference
Triage priority	Arrival order	Acuity drives priority; first come is not first served
Triage urgency	Diagnosis	Triage identifies how urgently care is needed; the provider determines the diagnosis
Everyday triage	Disaster triage	In disasters, the most critical patients may be deprioritized so resources save the most people
Primary survey	Full head-to-toe exam	Primary = rapid life-threat scan (ABCDE); secondary = comprehensive history and exam
A triage level	A permanent label	Levels change as patients improve or deteriorate — reassess and re-triage

Eli explains

The same idea, in plain words

Explain it like I’m 10

Triage is like a crossing guard deciding who crosses the street first — not by who got there first, but by who is in the most danger. A kid with a bleeding leg goes before someone with a stubbed toe, even if the toe person arrived earlier. The guard keeps watching, because the kid who seemed fine a minute ago might suddenly need help too.

Worked example

Four patients arrive in a busy ED within the same five minutes:

Mr. Chen, 68: crushing chest pain, diaphoretic, pale — he cannot finish a sentence. He is unstable and needs life-saving intervention: ESI 1. He goes to the resuscitation room immediately.
Ms. Patel, 41: a deep arm laceration from a kitchen knife, bleeding is controlled with pressure. She is stable but needs sutures and a tetanus review: ESI 3–4.
Leo, 6: fever of two days, drinking fluids, playful between temperatures: ESI 4 — he can wait, with a parent, and should be rechecked.
Mr. Gomez, 29: ankle pain from a weekend pickup game, walking with a limp: ESI 5 — lowest priority.

An hour later, the nurse rechecks the waiting room and finds Leo limp, difficult to rouse, and not responding to his mother. The nurse immediately re-triages him — he is now ESI 1–2 — moves him to a treatment room, and alerts the team. Nothing about Leo's first triage was wrong; the reassessment is what saved him. The same walk-through works on the unit: the "stable" postoperative patient who becomes confused and tachycardic is your Level 1 of the shift.

Key takeaways

Triage sorts by acuity, never by arrival order.
ESI Level 1 means the patient needs immediate life-saving intervention; Level 2 means high risk or severe distress — these patients cannot wait.
In disaster triage, priorities invert: limited resources go where they save the most lives, and the most critically injured may be tagged and passed over.
The primary survey follows ABCDE — airway, breathing, circulation, disability, exposure — and life threats are treated as they are found.
Triage is dynamic: reassess at intervals and whenever the patient changes. Re-triage up or down as needed.
OPQRST and SAMPLE are question organizers, not rigid scripts.
Document facts with times; hand off with SBAR so urgency is never lost in translation.

Check yourself

6 review questions from the chapter. Try each one, then open the answer.

What is the difference between triage and diagnosis?
Show answer
Triage sorts urgency — how fast the patient needs care. Diagnosis identifies the disease or injury causing the problem. The triage nurse sorts; the provider diagnoses.
Why does the primary survey use the ABCDE order, and what should happen when a life threat is found?
Show answer
ABCDE forces the nurse to check the most life-threatening systems first (airway before circulation, for example). Life threats are treated as they are found, before moving on — you don't finish the scan while someone's airway is blocked.
What makes a patient an ESI Level 1 versus Level 2?
Show answer
Level 1 patients need immediate life-saving intervention (for example, inadequate breathing). Level 2 patients are high risk, in severe distress, or in danger if they wait — they need care urgently but not the resuscitation room this second.
How does disaster triage differ from everyday ED triage?
Show answer
Everyday triage gives the most critical patients top priority. Disaster triage aims at the greatest good for the greatest number, so resources are directed where they save the most lives — sometimes passing over the most critical patients.
A patient in the waiting room is "stable" at triage. When should the nurse recheck them?
Show answer
Reassess at intervals set by the department's protocol, whenever the patient reports a change, and whenever anything about their appearance or behavior looks off. Reassessment is not optional — it is the step that catches deterioration.
Why is time-stamped, factual documentation important in triage?
Show answer
Time-stamped, factual documentation creates a reliable timeline of the patient's condition, supports the next clinician's decisions, and protects patient safety — and the nurse — if the case is later reviewed.

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Study tools & related lessonsKey vocabulary · Related

Key vocabulary

Triage: Sorting patients by urgency of need when demand exceeds capacity
Acuity: How urgently a patient needs care
Emergency Severity Index (ESI): A five-level ED triage tool that combines stability with resource needs
Primary survey: The rapid ABCDE scan for immediate life threats
Secondary survey: The focused history and physical exam done after life threats are managed
Reassessment: Repeating vital signs, findings, and triage level at intervals
SBAR: Situation, Background, Assessment, Recommendation — a structured handoff tool

Sources & references

openstax.org — Medical Surgical Nursing

This lesson was adapted from the open educational references above; their licenses and attributions are preserved. See Copyright & Licensing.

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