Emergency Medicine · Paediatrics · Infectious Disease
Rule of 7s for Lyme Meningitis calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
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0
Low risk of Lyme meningitis (all three criteria met)
Band: Low risk of Lyme meningitis (all three criteria met)
Interpretation. Low risk of Lyme meningitis (all three criteria met)
Suggested management. Headache under 7 days, CSF mononuclear cells under 70% and no cranial nerve palsy: the Rule of 7s classifies the child as low risk for Lyme meningitis.
Rule of 7s for Lyme Meningitis: 0 — Low risk of Lyme meningitis (all three criteria met). Interpretation: Low risk of Lyme meningitis (all three criteria met) What to do: Headache under 7 days, CSF mononuclear cells under 70% and no cranial nerve palsy: the Rule of 7s classifies the child as low risk for Lyme meningitis. Inputs: Headache for 7 days or more (+1): false; CSF mononuclear cells 70% or more (+1): false; Seventh or other cranial nerve palsy (+1): false Source: Garro AC et al. Rule of 7s for identifying children at low risk of Lyme meningitis (Pediatrics 2009, PMID 19403484); validated by Cohn KA et al. Validation of the Rule of 7's for Identifying Children at Low-risk for Lyme Meningitis. Pediatrics. DOI: 10.1542/peds.2020-029284. PMID: 33710975. Low risk only when all three hold: headache for less than 7 days, less than 70% CSF mononuclear cells, and no seventh or other cranial nerve palsy. Any one of headache ≥7 days, ≥70% CSF mononuclear cells or a cranial nerve palsy means the child is not low risk. (2021)
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Clinical inputs
- Headache for 7 days or more (+1)
- CSF mononuclear cells 70% or more (+1)
- Seventh or other cranial nerve palsy (+1)
Primary source
Garro AC et al. Rule of 7s for identifying children at low risk of Lyme meningitis (Pediatrics 2009, PMID 19403484); validated by Cohn KA et al. Validation of the Rule of 7's for Identifying Children at Low-risk for Lyme Meningitis. Pediatrics. DOI: 10.1542/peds.2020-029284. PMID: 33710975. Low risk only when all three hold: headache for less than 7 days, less than 70% CSF mononuclear cells, and no seventh or other cranial nerve palsy. Any one of headache ≥7 days, ≥70% CSF mononuclear cells or a cranial nerve palsy means the child is not low risk. (2021)
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