Pediatric Head CT Rule > 2 years old

Guideline · Oct 2018 · 1 min read

In brief

Clinical decision rule for determining when head CT imaging is indicated in children over 2 years old, likely addressing trauma evaluation and minimizing unnecessary radiation exposure.

PECARN rule stratifies pediatric head injury risk in children ≥2 years to guide CT imaging decisions and reduce unnecessary radiation.
No CT needed if child has NO altered mental status, NO basilar skull fracture signs, AND NO severe mechanism/LOC/vomiting/severe headache.
CT recommended for GCS <15, altered mental status, or signs of basilar skull fracture regardless of mechanism.
Observation vs. CT appropriate for isolated severe mechanism, LOC, vomiting, or severe headache without AMS or skull fracture signs.
Severe mechanisms include fall >5 feet, no helmet, or high-impact trauma—key triggers for escalating evaluation beyond discharge.

Written by the GCMD Library team from the guideline.

Patient Age Stratification

The PECARN rule divides pediatric head trauma patients into two age groups: under 2 years and 2 years or older. Each age group has distinct clinical criteria for determining CT imaging necessity.

High-Risk Criteria Requiring CT

Patients with altered mental status, GCS less than 15, or signs of basilar skull fracture require head CT imaging. These findings indicate significant risk for clinically important traumatic brain injury.

Intermediate-Risk Criteria for Observation

History of loss of consciousness, vomiting, severe headache, or severe mechanism of injury warrant observation versus CT consideration. Clinical judgment and shared decision-making guide imaging decisions in this intermediate-risk group.

Low-Risk Criteria for Discharge

Patients without any high-risk or intermediate-risk criteria can be safely discharged without CT imaging. This applies to children with isolated scalp hematomas, minor mechanisms, and normal neurological examinations.

Severe Mechanism Definition

Severe mechanisms include motor vehicle crash with ejection or rollover, pedestrian/bicyclist struck by vehicle, fall from significant height (>5 feet for older children), or head struck by high-impact object. These mechanisms increase risk for intracranial injury even without immediate symptoms.

Full text

> 5 ft no helmet PECARN Pediatric Head CT Rule CT Head RecommendedObservation vs. CT HeadDischarge No CT Required! 2 years or older NONE History of LOC or History of vomiting or Severe headache or Severe mechanism* NONE AMS or GCS < 15 or Signs of basilar skull fx *SEVERE MECHANISMS

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