{"uid":"cap_6-OAsAfSOW5ZEwh28J8G2","slug":"crb-65-score-calculator-lim-2003-fc868db3","name":"CRB-65 Score Calculator (Lim 2003)","description":"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.","url":"https://api.magentlab.com/api/calc/crb65","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":["age","confusion","respiratory_rate_ge_30","low_blood_pressure"],"properties":{"age":{"type":"integer","description":"Age in years (18-120). Age ≥65 scores 1."},"confusion":{"type":"boolean","description":"New confusion (C) as assigned by the caller. true or false."},"low_blood_pressure":{"type":"boolean","description":"SBP <90 mmHg or DBP ≤60 mmHg (B) as assigned by the caller. true or false. magent does not take BP numbers."},"respiratory_rate_ge_30":{"type":"boolean","description":"Respiratory rate ≥30/min (R) as assigned by the caller. true or false."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"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"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ZuAztsbjcBU3A-K24eb--","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes the CRB-65 pneumonia severity score (0–4) from caller-assessed confusion, respiratory rate, blood pressure, and age flags","exampleAgentPrompt":"Calculate the CRB-65 score for a 72-year-old patient who has new confusion, a respiratory rate of 32 breaths per minute, and a systolic blood pressure of 85 mmHg — confusion is present, respiratory rate is flagged high, and blood pressure is flagged low.","exampleUseCases":[{"title":"ED triage for pneumonia patient","prompt":"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."},{"title":"Outpatient pneumonia risk check","prompt":"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?"},{"title":"Automated pneumonia scoring in EHR workflow","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T01:02:25.408Z","isFirstParty":false}