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Free CURB-65 calculator for adults with suspected community-acquired pneumonia. Score confusion, urea/BUN, respiratory rate, blood pressure, and age ≥65. Built for teaching and checklist practice—always align disposition with local guidelines and bedside assessment.
Last updated: April 13, 2026
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As assessed clinically; often operationalized with abbreviated mental test or similar tools in trials.
U — Urea / nitrogen
2
Moderate risk
Score 2 often prompts short inpatient stay, hospital-supervised outpatient therapy, or enhanced outpatient follow-up depending on stability and comorbidity.
Original cohorts reported approximate 30-day mortality near 0.7%, 9.2%, and 15% for scores 0, 1, and 2, and higher for 3+; modern outcomes vary with vaccination, pathways, and case mix.
Clinical use
CURB-65 aids risk stratification; it does not replace imaging, oxygenation assessment, or institution-specific pathways (e.g. PSI/PORT, SMART-COP). Pregnancy, immunosuppression, and nursing-home pathogens may change management despite a low score.
Designed for emergency departments and wards where a full PSI worksheet is impractical.
Switch between mmol/L urea and BUN mg/dL so the U criterion matches your chemistry panel.
One point if systolic is under 90 or diastolic is 60 or below—matching the original definition.
Summaries describe typical outpatient vs inpatient teaching tied to score thresholds.
Includes approximate 30-day mortality figures from foundational studies—modern populations may differ.
If your hospital mandates Pneumonia Severity Index classes, use that pathway in parallel.
Age 72, BUN 22 mg/dL, otherwise stable vitals, no confusion.
CURB-65 total
2
Moderate risk
CURB-65 condenses pneumonia mortality risk into five widely available measures. It is endorsed in multiple international guidelines as an adjunct to clinical gestalt, pulse oximetry, and follow-up reliability. In ambulatory settings, scores of 0–1 often support oral antibiotics with safety-net advice, while higher scores increase the probability of inpatient care—especially when hypoxemia or comorbid illness is present.
Escalating illness? See SOFA score for multi-organ dysfunction context.
Get Custom Calculator for Your PlatformA patient can reach CURB-65 of 2 purely from age ≥65 and urea/BUN elevation while appearing hemodynamically stable. That pattern still warrants careful assessment of oral intake, sepsis, and prerenal azotemia versus intrinsic renal injury—scores support risk awareness, not a single label.
Share with teams reviewing CAP pathways.
Suggested hashtags: #Pneumonia #CURB65 #CAP #Medicine #Calculator