Trauma Assessment: A Complete Step by Step Guide for Students

Lachlan Baillie, Registered Paramedic

10 minutes ago

8 min read

Trauma patients are some of the most confronting you will see as a student. There is noise, blood, bystanders and often a mechanism that makes everyone's heart rate go up, including yours. The good news is that trauma assessment is one of the most structured things you will ever learn. If you follow the same system every time, the chaos becomes manageable, and you are far less likely to miss the injury that actually kills the patient. This guide walks through the whole process, from arriving on scene to handing over at hospital, and explains why each step sits where it does.

Why a system matters

Trauma kills in a predictable order. A patient with catastrophic bleeding can die in minutes. A patient with a blocked airway can die in a few minutes more. Breathing problems such as a tension pneumothorax follow, then circulatory shock, then brain injury. The structured approach used around the world, built on the Advanced Trauma Life Support principles, simply mirrors that order. You find and fix the fastest killer first, then move to the next.

The other reason for a system is human factors. Under stress, people fixate on the most obvious injury, such as an open fracture, and walk straight past a quiet, deadly problem like a falling level of consciousness. A fixed sequence protects you from your own tunnel vision.

Treat the problem that will kill the patient first, not the problem that looks the worst.

Scene safety and the first ten seconds

Before you touch anyone, look after yourself and your crew. Check for traffic, fuel, electrical hazards, unstable structures, sharps, aggressive people and anything else that could create a second patient. Wear your PPE. Then count your patients and decide whether you need more help early, because it is always easier to stand extra resources down than to call for them late.

As you approach, form a general impression. Is the patient talking? What colour are they? Are they moving? Is there obvious bleeding? Many experienced clinicians make a "sick or not sick" call within seconds, and that gut feeling is worth listening to.

Mechanism of injury

The mechanism tells you what injuries to expect before you find them. High energy mechanisms should raise your suspicion of serious hidden injury, even if the patient looks well. Examples include:

Ejection from a vehicle, a rollover, or a death in the same vehicle.
Pedestrians or cyclists struck by a vehicle.
Motorcycle crashes, particularly at speed.
Falls from height, especially in older adults, where even a fall from standing can cause serious injury.
Significant intrusion into the passenger compartment.
Penetrating injuries to the head, neck, chest, abdomen or groin.

Look at the scene for clues: a bent steering wheel, a starred windscreen, a broken helmet or the height of a fall all tell a story about forces the body has absorbed.

The primary survey

The primary survey is a rapid assessment designed to find and treat immediately life threatening problems. You work through it in order, and if you find a problem at one step, you deal with it before moving on. If the patient deteriorates at any point, you go back to the start.

C: Catastrophic haemorrhage

Many services now place catastrophic external bleeding before the airway, often written as C ABCDE. This came from military experience, where massive limb bleeding was a leading preventable cause of death. A patient can bleed out from a major limb wound faster than they will die from most airway problems.

Look and sweep for major bleeding, including under the patient and inside bulky clothing. Control it with firm direct pressure, wound packing for junctional areas, and a tourniquet for life threatening limb bleeding, according to your service's guidelines. Note the time a tourniquet is applied.

A: Airway with cervical spine consideration

Can the patient talk in a normal voice? If so, their airway is open for now. Listen for noises that signal partial obstruction, such as snoring, gurgling or stridor, and look for blood, vomit, broken teeth or facial injuries that could compromise the airway.

Open and clear the airway with simple manoeuvres first. A jaw thrust is preferred over a head tilt when a spinal injury is possible. Suction, positioning and basic adjuncts come next, with advanced airways used by those trained and authorised to use them. Consider the cervical spine in any patient with a significant mechanism, but remember that a patent airway always takes priority over spinal precautions.

B: Breathing

Expose the chest and look, listen and feel. Count the respiratory rate properly. Look for equal chest rise, wounds, bruising, paradoxical movement and accessory muscle use. Listen to both sides of the chest. Feel for tenderness, crepitus and surgical emphysema.

You are hunting for the chest injuries that kill quickly:

Tension pneumothorax: falling saturation, absent breath sounds on one side, and falling blood pressure.
Open pneumothorax: a sucking chest wound that lets air in with each breath.
Flail chest: a segment of ribs moving the wrong way with breathing, usually with an underlying lung contusion.
Massive haemothorax: reduced breath sounds and signs of shock from blood filling the chest.

Give oxygen to hypoxic patients, titrated to a target saturation, and manage these injuries according to your scope of practice.

C: Circulation

Now assess for shock. Check the radial and central pulses, skin colour and temperature, capillary refill, level of consciousness and blood pressure. Remember that blood pressure often holds up until a large volume of blood has been lost, especially in young, fit adults and children. A rising heart rate, cool pale skin, anxiety and a narrowing pulse pressure are earlier warnings.

If there is no obvious external bleeding but the patient is shocked, think about where blood can hide. A useful phrase is "blood on the floor and four more":

On the floor: external bleeding you may already have controlled.
The chest: haemothorax.
The abdomen: solid organ injury such as the liver or spleen.
The pelvis and retroperitoneum: pelvic fractures can bleed massively.
Long bones: a femoral fracture alone can lose a significant volume of blood.

Suspected pelvic fractures should not be repeatedly sprung or rocked to "test" them, because this can disturb clots. A pelvic binder applied at the level of the greater trochanters is used in many services when a pelvic injury is suspected. Fluid and blood product strategies differ between services, so follow your local guidelines.

D: Disability

Assess the level of consciousness using AVPU for a quick check or the Glasgow Coma Scale for a more detailed score. Check pupil size and reaction, and look for limb weakness that differs between sides. Always check a blood glucose level in a patient with an altered level of consciousness, because hypoglycaemia can mimic or complicate a head injury.

A falling GCS is one of the most important findings in trauma. Record the score with its components, for example E3 V4 M6, so the next clinician can see exactly what changed.

E: Exposure and environment

You cannot treat what you cannot see. Expose the patient enough to examine them properly, including the back, while protecting their dignity. Then cover them again quickly. Trauma patients lose heat fast, even on a warm Queensland day, and hypothermia makes bleeding worse.

The lethal triad

Hypothermia, acidosis and coagulopathy are known as the lethal triad of trauma, and they feed each other. Blood loss reduces oxygen delivery, so tissues switch to anaerobic metabolism and produce acid. Acidosis and cold both stop clotting factors working properly. Poor clotting means more bleeding, which means more shock, more acid and more cooling. Once this spiral is established, it is very hard to reverse.

Prehospital and early care can do a lot to stop the spiral starting: control bleeding early, keep the patient warm from the moment you arrive, avoid unnecessary exposure, and minimise time on scene for patients who need surgery.

Time critical decisions

Some patients need an operating theatre, not more time on scene. Uncontrolled internal bleeding cannot be fixed on the roadside. Many services use time critical or major trauma criteria based on vital signs, injuries and mechanism to decide which patients should go directly to a major trauma service. Know your local criteria, recognise early when a patient meets them, and perform as much of your assessment as possible in the vehicle on the way.

The secondary survey

The secondary survey is a head to toe examination and a focused history, performed once immediate threats have been managed. In a critically injured patient, it often happens during transport or in the emergency department rather than on scene.

History

A common framework is AMPLE:

Allergies.
Medications, especially anticoagulants and antiplatelet drugs, which increase bleeding risk, and beta blockers, which can hide a rising heart rate.
Past medical history, including pregnancy.
Last oral intake.
Events leading up to the injury, including whether a medical cause such as a seizure, hypoglycaemia or a cardiac event triggered the incident.

Head to toe examination

Work systematically from the head down:

Head and face: scalp wounds, skull deformity, facial fractures, blood or fluid from the ears or nose, and bruising behind the ears or around the eyes.
Neck: tenderness, deformity, tracheal position and wounds.
Chest: reassess breath sounds, tenderness, bruising and seatbelt marks.
Abdomen: distension, tenderness, bruising and seatbelt marks. A soft, non tender abdomen does not rule out internal injury.
Pelvis: look for deformity and bruising, and avoid repeated springing.
Limbs: deformity, wounds, and circulation, sensation and movement below any injury.
Back: log roll if required and appropriate, and check for tenderness, deformity and wounds.

Reassessment

Trauma patients change. A patient who looked stable ten minutes ago can deteriorate as bleeding continues or as a pneumothorax builds. Repeat your primary survey and vital signs regularly, after every intervention, and every time you move the patient. Trends matter far more than any single set of observations.

Handover

A clear handover makes sure the receiving team knows what you know. Many services use structured formats that cover the patient's identity, mechanism, injuries found, signs and vital signs, treatment given and response. Keep it brief, keep it in order, and highlight anything time critical first.

Common student mistakes

Starting with the most dramatic injury instead of the primary survey.
Missing catastrophic bleeding hidden under the patient or in clothing.
Trusting a normal blood pressure in a young patient who is tachycardic and pale.
Forgetting to check a blood glucose level in a patient with a reduced GCS.
Leaving the patient exposed and cold.
Not reassessing after an intervention.
Spending too long on scene with a patient who needs a surgeon.

Conclusion

Good trauma assessment is not about memorising every possible injury. It is about following a reliable system that finds the fastest killers first: catastrophic bleeding, airway, breathing, circulation and disability, while keeping the patient warm and getting them to definitive care without delay. Practise the sequence until it becomes automatic, and you will find that even the most chaotic scene starts to feel structured.

References

American College of Surgeons Committee on Trauma. Advanced Trauma Life Support (ATLS) Student Course Manual. 10th ed. Chicago: American College of Surgeons; 2018.

Trauma Primary Survey. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing. https://www.statpearls.com/point-of-care/30542

Trauma Secondary Survey. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing. https://www.statpearls.com/point-of-care/37290

Hodgetts TJ, Mahoney PF, Russell MQ, Byers M. ABC to <C>ABC: redefining the military trauma paradigm. Emerg Med J. 2006;23(10):745.

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