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CRB-65 Score Calculator (Lim 2003)
x402
CRB-65 Score Calculator (Lim 2003) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Computes the CRB-65 pneumonia severity score (0–4) from caller-assessed confusion, respiratory rate, blood pressure, and age flags
Price / call$0.005
Success—
StatusUnknown
How this service works
Lim 2003 CRB-65 for community-acquired pneumonia: confusion, respiratory rate ≥30/min, low blood pressure (SBP <90 or DBP ≤60), and age ≥65; 1 point each, max 4. No urea. Score only; no mortality percentages or site-of-care bands. Not a diagnosis. Not CURB-65. Caller assigns the C, R, and B flags; magent does not convert BUN or take BP numbers.
Output
Returns a CRB-65 integer score from 0 to 4, calculated as one point each for: new confusion (caller-assigned), respiratory rate ≥30/min (caller-assigned), low blood pressure — SBP <90 or DBP ≤60 (caller-assigned), and age ≥65 (derived from the provided age). No mortality percentages or site-of-care recommendations are included; this is a raw score only.
Example use cases
ED triage for pneumonia patient
“I have a 68-year-old patient in the ED with community-acquired pneumonia — they have new confusion, their respiratory rate is 34, and their blood pressure is 88/55. Can you give me the CRB-65 score? Confusion: yes, RR≥30: yes, low BP: yes.”
Outpatient pneumonia risk check
“My outpatient is 58 years old, no confusion, breathing at 18 breaths per minute, and blood pressure is 120/80 — all normal flags. What's their CRB-65 score so I can decide if they need hospital referral?”
Automated pneumonia scoring in EHR workflow
“For the pneumonia audit, score this patient: age 75, confusion flag true, respiratory rate flag false (rate was 22), low blood pressure flag false. Give me the CRB-65 total.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/crb65When to prefer
Use this endpoint when you need a rapid CRB-65 score (Lim 2003) and BUN/urea is unavailable or impractical — it is the urea-free alternative to CURB-65 and is well-suited for primary care and community settings. Prefer it over manual computation when embedding clinical decision support in automated EHR workflows, triage agents, or audit pipelines. The caller must pre-classify the C, R, and B flags before calling; the API does not accept raw vital-sign numbers for BP or convert BUN values.
Side effects
- Missing required query parameters (age, confusion, respiratory_rate_ge_30, low_blood_pressure) returns a 4xx error
- Age outside 18–120 range may be rejected or produce unexpected output
- Passing continuous BP values instead of a pre-computed boolean for low_blood_pressure will cause an error — the API does not accept raw BP numbers
- Confusing this endpoint with CURB-65 (which requires urea/BUN) will produce an incomplete query
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/crb65",
"count": 2,
"items": [
{
"score": 0,
"formula": "crb65",
"citation": {
"id": "lim-2003",
"doi": "10.1136/thorax.58.5.377",
"title": "Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study",
"source": "Thorax. 2003;58(5):377-382",
"authors": "Lim WS, van der Eerden MM, Laing R, et al."
},
"age_years": 40,
"max_score": 4,
"components": [
{
"factor": "confusion",
"points": 0,
"present": false
},
{
"factor": "respiratory_rate_ge_30",
"points": 0,
"present": false
},
{
"factor": "low_blood_pressure",
"points": 0,
"present": false
},
{
"value": 40,
"factor": "age_ge_65",
"points": 0,
"present": false
}
],
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"formula_expression": "CRB-65 = confusion + respiratory_rate_ge_30 + low_blood_pressure + age_ge_65; max 4"
},
{
"score": 0,
"formula": "crb65",
"citation": {
"id": "lim-2003",
"doi": "10.1136/thorax.58.5.377",
"title": "Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study",
"source": "Thorax. 2003;58(5):377-382",
"authors": "Lim WS, van der Eerden MM, Laing R, et al."
},
"age_years": 40,
"max_score": 4,
"components": [
{
"factor": "confusion",
"points": 0,
"present": false
},
{
"factor": "respiratory_rate_ge_30",
"points": 0,
"present": false
},
{
"factor": "low_blood_pressure",
"points": 0,
"present": false
},
{
"value": 40,
"factor": "age_ge_65",
"points": 0,
"present": false
}
],
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"formula_expression": "CRB-65 = confusion + respiratory_rate_ge_30 + low_blood_pressure + age_ge_65; max 4"
}
]
}
}Tags
x402
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