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Community-Acquired Pneumonia Severity Assessment - Guide treatment decisions
New onset disorientation to person, place, or time
○ Negative - BUN ≤19 mg/dL
○ Negative - RR <30 breaths/min
○ Negative - BP normal
○ Negative - Age <65 years
Score 1 point for each criterion present:
30-Day Mortality:
Outpatient treatment
Short hospitalization or close monitoring
Hospitalization required, consider ICU
Urgent hospitalization, ICU strongly considered
CRB-65 omits urea/BUN for settings without lab access. Same scoring, but 0 = very low risk, 1-2 = increased risk (consider hospital), 3-4 = high risk (urgent hospital).
CURB-65 aids disposition decisions but should not replace clinical judgment. Consider comorbidities, social factors, and response to initial treatment.
| Score | Risk Level | 30-Day Mortality | Recommended Setting | Management |
|---|---|---|---|---|
| 0 | Low | 0.7% | Outpatient | Oral antibiotics, outpatient follow-up |
| 1 | Low | 2.1% | Outpatient | Consider hospital vs home with close follow-up |
| 2 | Moderate | 9.2% | Inpatient short stay | Hospital admission or supervised outpatient |
| 3 | High | 14.5% | Inpatient | Hospitalization, consider ICU if deteriorating |
| 4 | Very High | 40% | Inpatient/ICU | Urgent hospitalization, strong ICU consideration |
| 5 | Very High | 57% | ICU | ICU admission for intensive management |
Primary use is determining whether pneumonia patient can be safely treated at home or requires hospitalization. Validated for community-acquired pneumonia (CAP).
Quick bedside tool requiring minimal testing. Helps triage pneumonia patients and guide admission decisions in ED setting. Takes seconds to calculate.
CRB-65 variant (without BUN) useful in outpatient settings without immediate lab access. Guides decision to refer patient to hospital.
Provides objective mortality estimate to share with patients/families. Facilitates shared decision-making about treatment location and intensity.
Consider chronic conditions not captured by CURB-65: severe COPD, immunosuppression, heart failure, liver disease, inability to take oral medications.
Account for home support, transportation, medication access, and ability to follow up. Low CURB-65 with poor social support may still warrant admission.
Response to initial treatment matters. Patient improving with score 2 may be suitable for discharge; patient deteriorating with score 1 needs hospital.
Presence of empyema, abscess, or severe hypoxemia requiring supplemental oxygen warrants hospitalization regardless of CURB-65 score.
| Feature | CURB-65 | PSI/PORT |
|---|---|---|
| Variables | 5 simple criteria | 20 variables including labs |
| Complexity | Simple, bedside calculation | Complex, requires calculator |
| Time to Calculate | Seconds | Minutes with full labs |
| Risk Stratification | 3-4 risk groups | 5 risk classes |
| Ease of Use | Very easy, widely adopted | More cumbersome in practice |
| Sensitivity | Moderate | Higher, more variables |
| Best Use | Quick ED/primary care triage | Detailed risk assessment when time permits |
CURB-65 is a clinical prediction rule that stratifies community-acquired pneumonia (CAP) patients by mortality risk to guide treatment location decisions. It scores 5 criteria: Confusion, Urea >19 mg/dL, Respiratory rate ≥30, Blood pressure (SBP<90 or DBP≤60), and age ≥65. Use it for adult CAP patients to determine if outpatient treatment is safe or hospitalization is needed. Quick and practical for ED and primary care.
Score 2 indicates moderate risk (9.2% mortality) and generally warrants hospitalization or very close outpatient monitoring. However, clinical judgment is essential. Consider comorbidities, social support, ability to take oral medications, and response to initial treatment. Some stable score-2 patients with good support and follow-up may be candidates for outpatient care, while others clearly need admission. Use CURB-65 to guide, not dictate, decisions.
CRB-65 omits the urea/BUN component, making it useful when laboratory tests are unavailable (primary care, prehospital). It uses the same 4 remaining criteria. For CRB-65: 0 = very low risk (likely outpatient), 1-2 = increased risk (consider hospital referral), 3-4 = high risk (urgent hospital). CURB-65 provides more granular stratification with the lab value but CRB-65 is faster and usable anywhere.
No. CURB-65 was specifically developed and validated for community-acquired pneumonia. Hospital-acquired pneumonia (HAP) and ventilator-associated pneumonia (VAP) have different risk profiles, microbiology, and outcomes. Use HAP/VAP-specific risk stratification tools. CURB-65 also not validated for aspiration pneumonia, immunocompromised patients, or pneumonia in nursing home residents.
Many factors not captured by CURB-65 may require hospitalization: severe hypoxemia needing oxygen, inability to tolerate oral intake/medications, severe comorbidities (decompensated heart failure, COPD exacerbation), complications (empyema, abscess), lack of social support, homelessness, active substance abuse, pregnancy, immunosuppression, or patient/family preference. Always integrate clinical judgment with score.
PSI (Pneumonia Severity Index)/PORT uses 20 variables for more detailed risk stratification into 5 classes. It's more complex but potentially more accurate. CURB-65 is simpler with 5 variables and faster to calculate, making it more practical for busy clinical settings. Studies show comparable performance. Many clinicians prefer CURB-65 for ease of use. PSI may be better when comprehensive labs are already available.
CURB-65 is primarily for initial disposition decisions, not for tracking clinical course. Once admitted, use clinical criteria for discharge readiness: afebrile >24 hours, stable vital signs, improving oxygen saturation, tolerating oral intake, no other acute issues. Serial measurement of individual components (BP, RR, mental status) guides ongoing care, but repeating the full score adds limited value once admitted.
CURB-65 was derived from the British Thoracic Society pneumonia guidelines and validated across multiple cohorts. It simplifies the older CURB (without age) by adding the 65-year threshold. Widely validated internationally with consistent performance across diverse populations and healthcare systems.
Each criterion reflects disease severity: confusion indicates CNS effect of hypoxia/sepsis, elevated urea suggests dehydration/renal dysfunction, tachypnea reflects respiratory distress, hypotension indicates shock/sepsis, and age ≥65 correlates with comorbidity burden and physiologic reserve. Together they predict mortality and complications.
Use CURB-65 as one input among many for disposition. It provides objective risk estimate but shouldn't override clinical gestalt. Combine with assessment of comorbidities, social situation, oxygen needs, ability to take oral antibiotics, and patient preferences. Most valuable for borderline cases where admission decision is unclear.
This CURB-65 calculator is for educational and informational purposes only. While CURB-65 aids disposition decisions for community-acquired pneumonia, it should not replace comprehensive clinical assessment. Consider comorbidities, social factors, complications, and individual patient circumstances. Always consult qualified healthcare providers for treatment decisions.