Calculate the CURB-65 score to assess community-acquired pneumonia (CAP) severity and guide the site of care. Each component scores 1 point: Confusion (new-onset disorientation), Urea > 7 mmol/L (BUN > 20 mg/dL), Respiratory rate ≥ 30/min, Blood pressure (systolic < 90 OR diastolic ≤ 60 mmHg), and Age ≥ 65. Range 0–5. Interpretation: 0–1 low risk (likely outpatient; 30-day mortality ~1.5–2.4%), 2 moderate (consider admission or supervised discharge, ~9.2%), 3–5 high risk (hospital admission; consider ICU for 4–5; mortality rises to ~57% at score 5). Endorsed by the British Thoracic Society. Derived from Lim et al. 2003 (Thorax). Not medical advice.
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Key facts
Category
Health
Input types
checkbox
Output type
json
Sample coverage
4
API ready
Yes
Overview
The CURB-65 calculator scores community-acquired pneumonia severity from 0 to 5 using confusion, urea, respiratory rate, blood pressure, and age. Use the result to support decisions about outpatient care, observation, hospital admission, or possible ICU consideration; it is not medical advice.
When to use
Assess the severity of suspected community-acquired pneumonia in adults.
Review whether a low, moderate, or high CURB-65 risk category may support the planned site of care.
Document the five CURB-65 criteria consistently during clinical assessment.
How it works
1Select each criterion that applies: new-onset confusion, urea above 7 mmol/L or BUN above 20 mg/dL, respiratory rate of at least 30 per minute, low blood pressure, and age 65 or older.
2The calculator assigns 1 point for each selected criterion.
3It adds the points to produce a total score from 0 to 5.
4The result reports the corresponding low-, moderate-, or high-risk category and its stated care interpretation.
Use cases
Emergency and acute-care assessment of adults with community-acquired pneumonia.
Clinical documentation of pneumonia severity and site-of-care considerations.
Teaching and review of the CURB-65 scoring criteria for healthcare learners.
The patient is at least 65 years old, has elevated urea, and meets the blood-pressure criterion, but has no new confusion or respiratory rate of 30 or more.
Problem
Calculate the CURB-65 score and identify the associated risk category.
How to use
Select Urea, BP, and Age ≥ 65 years, leaving the other two criteria unchecked.