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Cohn 2012 Rule of 7s for Lyme Meningitis Risk Stratification
x402
Cohn 2012 Rule of 7s for Lyme Meningitis Risk Stratification is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Applies the Cohn 2012 Rule of 7s to classify a patient as low-risk or not-low-risk for Lyme meningitis based on headache duration, CSF mononuclear cell percentage, and cranial-nerve palsy status.
Price / call$0.005
Success—
StatusUnknown
How this service works
Cohn 2012 Rule of 7s. Low-risk for Lyme meningitis iff all three hold: headache duration <7 days, CSF mononuclear cells <70%, and no seventh or other cranial-nerve palsy. Seven days and 70% are not low-risk. The caller assigns duration, CSF differential, and palsy. magent does not examine nerves or count CSF cells. Not a Lyme diagnosis, not a medical device, and not a treatment or discharge order. Does not compute Avery 2006 logistic probabilities.
Output
Returns whether the patient satisfies all three low-risk criteria of the Cohn 2012 Rule of 7s: headache duration strictly less than 7 days, CSF mononuclear cells strictly less than 70%, and no cranial-nerve palsy. If all three hold, the patient is classified as low-risk for Lyme meningitis; otherwise not low-risk.
Example use cases
ED Lyme meningitis triage decision
“A child in the ED has had a headache for 3 days, their CSF shows 60% mononuclear cells, and there's no seventh-nerve palsy — run the Rule of 7s and tell me whether they're low-risk for Lyme meningitis.”
Borderline CSF result risk check
“My patient has a 7-day headache, 65% mononuclear cells on CSF, and no cranial-nerve palsy — apply the Cohn Rule of 7s and tell me if they meet low-risk criteria for Lyme meningitis.”
Cranial nerve palsy present scenario
“Patient with a 2-day headache and CSF mononuclear percent of 40%, but they have a seventh-nerve palsy — what does the Rule of 7s say about their Lyme meningitis risk?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/rule_7sWhen to prefer
Use this endpoint when you need to quickly apply the Cohn 2012 Rule of 7s threshold logic and the caller has already determined headache duration, CSF differential, and cranial-nerve exam findings. Prefer this over manual calculation to avoid threshold errors (7 and 70 are not low-risk). Do not use if you need Avery 2006 logistic regression probabilities or a full diagnostic workup — this is strictly arithmetic threshold classification.
Side effects
- Missing required query parameters (headache_days, csf_mononuclear_percent, cranial_nerve_palsy) returns a validation error
- headache_days outside integer range 0-90 may return an error
- csf_mononuclear_percent outside 0-100 may return an error
- Payment not provided or insufficient USDC (x402 protocol) results in a 402 Payment Required response
- Caller misinterprets not-low-risk as a Lyme diagnosis — the endpoint does not diagnose
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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