What is the 'platinum 10 minutes' in major trauma?

The platinum 10 minutes is a prehospital trauma guideline reflecting evidence that scene times above 10 minutes in patients with haemorrhage from penetrating or blunt trauma are associated with worse outcomes. The concept extends the 'golden hour' (time from injury to definitive surgical haemorrhage control) by emphasising that prehospital time is part of the total delay to surgery. In practice, this means limiting scene interventions to airway management, haemorrhage control with tourniquet or wound packing, and safe packaging. IV access and fluid resuscitation occur en route. Illustrative context only -- follow your agency's trauma protocol.

Why is scene time for cardiac arrest shorter than for trauma?

In out-of-hospital cardiac arrest, survival is critically dependent on: CPR quality (immediately possible on scene), defibrillation (possible with AED or defibrillator on scene) and advanced interventions available only in hospital (ECMO, cath lab for STEMI as the cause). After initial resuscitation interventions are in progress, extended scene time does not add clinical benefit -- transport to hospital allows access to interventions that are not available in the prehospital setting. ARC guidelines target short on-scene times with high-quality CPR during transport. Illustrative context only.

Should I ever stay on scene longer than the recommended time?

Yes. The targets are guidelines, not absolute rules. Situations where extended scene time is justified include: complex extrication (entrapment) where premature movement would worsen injury, unsafe scene requiring staging (active violence, structural instability), critical airway management requiring a definitive airway before safe transport, and paediatric cardiac arrest where high-quality CPR on scene may be equivalent to transport CPR. Document the clinical justification for any scene time significantly exceeding the target. Case review focuses on unexplained prolonged scene times, not necessarily all extended times.

Scene Time Calculator — Free Paramedics Calculator

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The crew arrived at a major trauma scene at 14:32 and is preparing to load the patient. Before departure the team leader checks the scene time against the platinum 10-minute guideline and the case type to decide whether additional interventions should wait until transport is underway.

Scene Time Calculator

Operations

Arrival time (hh / mm)

Departure time (hh / mm)

Case type

Evidence-based scene time targets:
Cardiac arrest: <8 min · Trauma: ≤10 min (Platinum 10) · Stroke: <15 min · General medical: <20 min Scene time = Departure − Arrival (adjusts for midnight crossover)

💡 "Load and go" for time-critical conditions. Definitive care cannot be delivered at scene for major trauma, STEMI, and stroke.

Reference: ARC Resuscitation Guidelines · ATLS — RCSENG

⚕️ Clinical safety: 🇦🇺 Verify with facility drug formulary and senior clinician · Meets AHPRA/ACSQHC standards

1 What this calculator does

Calculates time on scene from arrival and departure times. Compares the scene time against recommended targets for cardiac arrest (8 minutes), trauma (10 minutes), stroke (15 minutes) and general medical cases (20 minutes). Handles midnight crossover automatically.

2 Formula & professional reasoning

Scene time (minutes) = Departure time - Arrival time
Targets by case type:
  Cardiac arrest: warn >8 min | critical >15 min
  Major trauma: warn >10 min (platinum 10 minutes) | critical >20 min
  Stroke: warn >15 min (thrombolysis window) | critical >25 min
  General medical: warn >20 min | critical >30 min

Time-sensitive emergencies have well-established relationships between time to definitive care and patient outcomes. In cardiac arrest, prolonged scene times reduce survival by delaying hospital resuscitation resources (ECMO, cath lab). Trauma haemorrhage control is definitive only in the operating room -- the 'platinum 10 minutes' reflects evidence that scene times beyond 10 minutes in major haemorrhage worsen outcomes. Stroke thrombolysis has a 4.5-hour window from symptom onset -- every minute of avoidable scene time reduces the available treatment window. Scene time accountability is a core quality indicator in every major EMS system.

3 Worked examples

⚠️ Illustrative example only — not clinical or professional instruction.

Basic

Major trauma -- scene time check

Given: Arrival: 14:32 | Departure: 14:44 | Case type: major trauma

Working: Scene time: (14:44) - (14:32) = 12 minutes | Trauma target: warn >10 min | 12 > 10 -- approaching limit

Answer: Scene time: 12 minutes -- Approaching limit for major trauma (platinum 10 minutes guideline). Expedite departure.

💡 Illustrative example only. Verify all clinical decisions with your agency protocol, medical director and partner clinician. Meets AHPRA/ACSQHC prehospital care standards. 12 minutes on scene for major trauma is approaching the critical threshold. Any remaining interventions (IV access, wound packing) should be performed en route where possible. Pre-notify the trauma team.

Standard

Cardiac arrest -- 7 minutes on scene

Given: Arrival: 22:15 | Departure: 22:22 | Case type: cardiac arrest

Working: Scene time: 22:22 - 22:15 = 7 minutes | Cardiac arrest target: warn >8 min | 7 < 8 -- within target

Answer: Scene time: 7 minutes -- Within target for cardiac arrest (<8 min). Good scene management.

💡 Illustrative example only. Verify all clinical decisions with your agency protocol, medical director and partner clinician. Meets AHPRA/ACSQHC prehospital care standards. 7 minutes for a cardiac arrest scene is excellent. CPR quality, airway management and defibrillation decisions should all occur in this window. ALS interventions (IV access, drugs) can continue during transport in a moving vehicle.

Advanced

Stroke with midnight crossover

Given: Arrival: 23:52 | Departure: 00:14 (next day) | Case type: stroke

Working:

Arrival: 23x60+52 = 1432 minutes | Departure: 00:14 = 0x60+14 = 14 minutes | 14 < 1432 -- midnight crossover detected | Add 1440 min: 14+1440 = 1454 min | Scene time: 1454 - 1432 = 22 minutes

Answer: Scene time: 22 minutes -- Exceeds recommended limit for stroke (>15 min). Thrombolysis window being consumed. Expedite transport and pre-notify.

💡 Illustrative example only. Verify all clinical decisions with your agency protocol, medical director and partner clinician. Meets AHPRA/ACSQHC prehospital care standards. 22 minutes on scene for a suspected stroke is above the 15-minute guideline. The thrombolysis window (4.5 hours from symptom onset) is being used up at the scene. Identify symptom onset time, pre-notify the stroke unit and ensure transport is expedited.

4 Sanity check

Scene time targets by case type

Cardiac arrest: warn >8 min | Major trauma: warn >10 min (platinum 10) | Stroke: warn >15 min | General medical: warn >20 min

These are guidelines, not absolute thresholds. Clinical necessity (airway management, extrication) may justify longer scene times in specific cases.

Interventions to perform en route vs on scene

On scene: airway management, defibrillation, CPR, haemorrhage control, extrication | En route: IV access, drug administration, secondary survey, documentation

Packaging for transport should begin as soon as the immediate life threats are addressed.

Pre-notification reduces hospital preparation time

Alerting the receiving hospital of case type, expected arrival time and clinical status allows parallel preparation of trauma bays, cath labs, stroke teams and resuscitation areas

Scene time accountability

Scene time is a quality indicator reviewed in case audits | Excessively long or unnecessarily short scene times both trigger review

5 Common errors

Error	Cause	Consequence	Fix
Confusing on-scene time with response time	Including travel time from dispatch to arrival in the scene time calculation	Scene time appears longer than actual, potentially triggering false quality concerns	Scene time is measured from the point at which the crew arrives at the patient's side (or the scene perimeter in hazmat or complex scenes) to the point of departure. Response time (dispatch to arrival) is a separate metric. Document both times.
Not pre-notifying the receiving hospital because the scene time appears acceptable	Treating scene time targets as the primary indicator of case urgency	Hospital not prepared for a time-sensitive patient -- delays in definitive care	Pre-notification should be based on clinical urgency and time-sensitivity of the condition, not just scene time. A patient with stroke symptoms should be pre-notified regardless of scene time. Pre-notification triggers parallel preparation at the receiving hospital, reducing total time to definitive care.
Prolonging scene time for interventions that can be safely performed during transport	Completing the full assessment and all interventions before packaging the patient	Unnecessary delay in transport for time-critical conditions	For time-sensitive conditions (trauma, cardiac arrest, stroke, STEMI), load and go -- perform IV access, secondary survey and drug administration en route. Reserve scene time for: airway management, defibrillation, major haemorrhage control and safe packaging for transport.
Not accounting for midnight crossover in the time calculation	Subtracting clock times without noting the day boundary	Departure time appears earlier than arrival time -- negative or incorrect scene time	When departure time is earlier on the clock than arrival time (midnight crossover), add 1440 minutes (24 hours) to the departure time before subtracting. The calculator handles this automatically.

6 Reference & regulatory links

🇦🇺 Australia

🇺🇸 United States

7 Professional workflow

Common tools used alongside this one:

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Revised Trauma Score (RTS)

Revised Trauma Score quantifies trauma severity -- high RTS scores with prolonged scene time trigger trauma team activation

→

❤️

Shock Index

Shock Index identifies haemodynamic instability that increases urgency for minimising scene time

→

Input	Result
Cardiac arrest target	<8 minutes on scene
Platinum 10 (trauma)	<10 minutes on scene
Stroke target	<15 minutes on scene
Pre-notify	On departure -- not on arrival