PECARN Pediatric Head CT Decision Rule

Apply PECARN validated prediction rule to identify children at very low risk for clinically important TBI, avoiding unnecessary CT radiation. Age <2yr: GCS <15, altered status, palpable skull fracture, scalp hematoma, LOC 5s+, non-frontal scalp hematoma.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How to Use

Enter the values for the scenario you are assessing. Apply PECARN validated prediction rule to identify children at very low risk for clinically important TBI, avoiding unnecessary CT radiation. Age <2yr: GCS <15, altered status, palpable skull fracture, scalp hematoma, LOC 5s+, non-frontal scalp hematoma. Use the pecarn head ct result to inform your calculation.

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Frequently Asked Questions