Emergency Medicine · Paediatrics · Neurosurgery
CATCH Rule for Pediatric Head CT calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Result
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0
CATCH negative
Band: CATCH negative
Interpretation. CATCH negative
Suggested management. No CATCH high/medium factors; CT not required by the rule alone.
CATCH Rule for Pediatric Head CT: 0 — CATCH negative. Interpretation: CATCH negative What to do: No CATCH high/medium factors; CT not required by the rule alone. Inputs: GCS not 15 within 2 hours: false; Suspicion of open/depressed skull fracture: false; Worsening headache: false; Irritability: false; Large boggy scalp hematoma: false; Signs of basal skull fracture: false; Dangerous mechanism of injury: false Source: Osmond MH et al. CATCH: a clinical decision rule for the use of computed tomography in children with minor head injury. CMAJ. DOI: 10.1503/cmaj.091421. PMID: 20142371. Scope: four high-risk (GCS not 15 within 2 h, suspected open skull fracture, worsening headache, irritability) plus three medium-risk (large boggy scalp hematoma, basal skull fracture signs, dangerous mechanism); any positive → CT per CATCH. (2010)
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Clinical inputs
- GCS not 15 within 2 hours
- Suspicion of open/depressed skull fracture
- Worsening headache
- Irritability
- Large boggy scalp hematoma
- Signs of basal skull fracture
- Dangerous mechanism of injury
Primary source
Osmond MH et al. CATCH: a clinical decision rule for the use of computed tomography in children with minor head injury. CMAJ. DOI: 10.1503/cmaj.091421. PMID: 20142371. Scope: four high-risk (GCS not 15 within 2 h, suspected open skull fracture, worsening headache, irritability) plus three medium-risk (large boggy scalp hematoma, basal skull fracture signs, dangerous mechanism); any positive → CT per CATCH. (2010)
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