PECARN Calculator

The PECARN (Pediatric Emergency Care Applied Research Network) rule separates pediatric patients into two distinct age groups: children under two years old and children aged two years and older. The calculation relies on a decision tree evaluating specific high-risk predictors: altered mental status, palpable skull fractures, signs of basilar skull fracture, history of loss of consciousness, severe mechanism of injury, and severe headache or scalp hematoma location. If any predictor is present, the risk category elevates, guiding clinicians on whether imaging is clinically warranted.

Consider a clinical scenario involving a 4-year-old child who presents to the emergency department after falling off playground equipment. The patient is awake, alert, and interactive, displaying a Glasgow Coma Scale of 15. The clinician reviews the PECARN parameters for children aged 2 and older: there is no altered mental status, no signs of basilar skull fracture, and no severe headache. However, the child experienced a brief loss of consciousness and has a non-frontal scalp hematoma. Based on the PECARN decision tree, the presence of these intermediate-risk indicators helps the medical team weigh the low overall risk of traumatic brain injury against the risks of undergoing a head CT scan.

Always perform a thorough physical examination to identify subtle signs like basilar skull fractures or non-frontal scalp hematomas before running the assessment. Remember that clinical decision rules like PECARN are designed to assist, not replace, clinical judgment and direct observation. When in doubt regarding a child's changing neurological status over time, serial monitoring or consultation with a pediatric specialist is strongly recommended.