C U R B65
Young patient with mild CAP, suitable for outpatient treatment
Why This Health Metric Matters
Why: This calculation helps assess important health parameters for clinical and personal wellness tracking.
How: Enter your values above and the calculator will apply validated formulas to compute your results.
- ●Evidence-based calculations
- ●Used in clinical settings worldwide
- ●Regular monitoring recommended
Clinical Sample Scenarios
Low Risk - Young Adult
Low RiskYoung patient with mild CAP, suitable for outpatient treatment
Low Risk - Elderly Alert
Low RiskElderly patient but otherwise low risk
Moderate Risk (CURB-65 = 2)
ModerateElderly with elevated BUN and tachypnea
High Risk (CURB-65 = 3)
High RiskConfused elderly patient with hypotension
Very High Risk (CURB-65 = 4-5)
CriticalSevere CAP requiring ICU consideration
Immunocompromised Patient
SpecialLower threshold for admission
Multilobar Pneumonia
ModerateMore extensive disease warrants admission
Urea in mmol/L
ModerateUsing international units for urea
Enter Patient Data
CURB-65 Criteria
Additional Parameters
Risk Factors
⚠️For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
🏥 Health Facts
— WHO
— CDC
What is the CURB-65 Score?
CURB-65 is a clinical prediction rule validated for predicting mortality in community-acquired pneumonia (CAP). It helps determine the most appropriate care setting: outpatient treatment, hospital admission, or ICU care.
The score was developed by the British Thoracic Society and is endorsed by the Infectious Diseases Society of America (IDSA) and American Thoracic Society (ATS) guidelines.
Clinical Pearl: CURB-65 is best at identifying LOW-RISK patients safe for outpatient treatment.
C
Confusion
U
Urea
R
RR≥30
B
BP Low
65
Age≥65
Score 0-1
Outpatient
Score 2
Observe/Admit
Score 3-5
Hospital/ICU
30-Day Mortality by CURB-65 Score
| Score | Mortality | Risk | Disposition |
|---|---|---|---|
| 0 | 0.6-1.2% | Low risk | Outpatient |
| 1 | 2.0-3.2% | Low risk | Outpatient or Brief Observation |
| 2 | 5.2-9.0% | Intermediate risk | Short inpatient or Supervised Outpatient |
| 3 | 12-17% | High risk | Hospital admission |
| 4 | 23-35% | High risk | Hospital admission, consider ICU |
| 5 | 40-60% | Very high risk | ICU admission |
Understanding CURB-65 Scoring
CURB-65 is a clinical prediction rule validated for assessing severity of community-acquired pneumonia (CAP) and guiding disposition decisions.
C
Confusion
New disorientation
U
Urea/BUN
>7 mmol/L (20 mg/dL)
R
Respiratory Rate
≥30/min
B
Blood Pressure
SBP <90 or DBP ≤60
65
Age
≥65 years
Risk Stratification and Mortality
Low Risk (Score 0-1)
0.6-2.7%
30-day mortality
Outpatient treatment appropriate
Intermediate Risk (Score 2)
6.8-9.2%
30-day mortality
Consider short hospitalization
High Risk (Score 3-5)
14-27%
30-day mortality
Hospital/ICU admission required
CRB-65 vs CURB-65
CURB-65 (Hospital Setting)
- • Requires BUN laboratory test
- • More accurate risk stratification
- • Standard for inpatient decision-making
- • Score 0-5 points
CRB-65 (Community/Primary Care)
- • No laboratory tests needed
- • Can be used at bedside/office
- • Useful for initial triage
- • Score 0-4 points
CAP Antibiotic Guidelines (IDSA/ATS 2019)
Outpatient (CURB-65 0-1)
- • No comorbidities: Amoxicillin OR Doxycycline OR Macrolide (if local resistance <25%)
- • With comorbidities: Amoxicillin-clavulanate OR Cephalosporin PLUS Macrolide/Doxycycline
- • Alternative: Respiratory fluoroquinolone (moxifloxacin, levofloxacin)
Non-ICU Inpatient (CURB-65 2-3)
- • Beta-lactam (ceftriaxone, ampicillin-sulbactam, cefotaxime) PLUS Macrolide
- • OR Respiratory fluoroquinolone monotherapy
- • Duration: Minimum 5 days, until afebrile 48-72h and clinically stable
ICU Inpatient (CURB-65 4-5)
- • Beta-lactam PLUS Macrolide (preferred)
- • OR Beta-lactam PLUS Fluoroquinolone
- • Add MRSA coverage if risk factors (vancomycin or linezolid)
- • Add Pseudomonas coverage if risk factors (piperacillin-tazobactam, cefepime)
Clinical Pearls for CURB-65
- 💡CURB-65 should be used in conjunction with clinical judgment, not in isolation
- 💡Consider admission for score of 2 if other risk factors present (hypoxia, multilobar disease)
- 💡Score of 3+ generally warrants ICU evaluation
- 💡Young patients may have low CURB-65 despite severe illness
- 💡Use PSI/PORT score if more detailed prognostication needed
- 💡Social factors may necessitate admission even with low scores
- 💡Always check oxygen saturation - not captured in CURB-65
ICU Admission Criteria (IDSA/ATS)
Major Criteria (1 = ICU)
- • Septic shock requiring vasopressors
- • Respiratory failure requiring mechanical ventilation
Minor Criteria (3+ = ICU)
- • RR ≥30 breaths/min
- • P/F ratio ≤250
- • Multilobar infiltrates
- • Confusion/disorientation
- • BUN ≥20 mg/dL
- • WBC <4,000 cells/μL
- • Platelets <100,000/μL
- • Temperature <36°C
- • Hypotension requiring fluids
Common CAP Pathogens
Typical Bacteria
- • Streptococcus pneumoniae - Most common
- • Haemophilus influenzae
- • Moraxella catarrhalis
- • Staphylococcus aureus (including MRSA)
- • Gram-negative bacilli (elderly, comorbidities)
Atypical Pathogens
- • Mycoplasma pneumoniae
- • Chlamydophila pneumoniae
- • Legionella pneumophila
- • Respiratory viruses (influenza, RSV, SARS-CoV-2)
Factors Beyond CURB-65 for Admission Decision
- • Hypoxemia: SpO2 <90% or PaO2 <60 mmHg on room air
- • Multilobar involvement: Infiltrates in multiple lobes
- • Pleural effusion: Especially if large or loculated
- • Comorbidities: COPD, heart failure, diabetes, renal/liver disease, malignancy
- • Immunocompromise: HIV, transplant, chemotherapy, steroids
- • Social factors: Inability to take oral medications, no caregiver, homeless
- • Recent antibiotic failure: Treatment failure as outpatient
- • Rapid deterioration: Clinical worsening over hours
Antibiotic Duration Guidelines
Standard Duration
- • Minimum 5 days of therapy
- • Continue until afebrile for 48-72 hours
- • Patient should be clinically stable
- • No more than 1 CAP-associated sign of instability
Extended Duration Needed
- • Legionella: 7-14 days
- • Lung abscess: 4-6 weeks
- • Empyema: 2-4 weeks + drainage
- • Pseudomonas: 14 days
- • MRSA: 7-21 days depending on severity
CURB-65 Quick Summary
Score 0-1
Outpatient
Mortality <3%
Score 2
Consider Admission
Mortality ~9%
Score 3-5
Hospital/ICU
Mortality 14-27%
Recognizing Treatment Failure
Early Failure (<72 hours)
- • Persistent fever despite antibiotics
- • Worsening respiratory status
- • Hemodynamic instability
- • Consider: resistant pathogen, wrong diagnosis, empyema
Late Failure (>72 hours)
- • Initial improvement then deterioration
- • Development of complications
- • Consider: superinfection, empyema, drug fever
- • May need additional imaging/cultures
Pneumonia Prevention
Vaccinations
- • Pneumococcal vaccine (PCV20, PPSV23)
- • Annual influenza vaccine
- • COVID-19 vaccination
- • Consider RSV vaccine (≥60 years)
Risk Reduction
- • Smoking cessation
- • Limit alcohol intake
- • Good oral hygiene
- • Manage comorbidities (diabetes, COPD, CHF)
Hospital Discharge Criteria
- • Temperature ≤37.8°C (100°F) for ≥24 hours
- • Heart rate ≤100 bpm
- • Respiratory rate ≤24/min
- • Systolic BP ≥90 mmHg without vasopressors
- • SpO2 ≥90% on room air (or baseline O2)
- • Able to maintain oral intake
- • Mental status at baseline
- • No other active medical issues requiring hospitalization
Follow-Up Recommendations
Clinical Follow-Up
- • Phone call within 48-72 hours post-discharge
- • Office visit within 1-2 weeks
- • Assess symptom resolution
- • Verify completion of antibiotics
Chest X-Ray Follow-Up
- • Not routine for all patients
- • Consider at 6-8 weeks if: smoker, age >50, persistent symptoms
- • Rule out underlying malignancy
- • Radiographic resolution may lag behind clinical
CURB-65 Limitations
- • Does not include oxygen saturation - critically important parameter
- • May underestimate severity in young patients without comorbidities
- • Does not account for comorbidities directly
- • Social factors not considered
- • Does not predict causative organism
- • Originally validated in hospitalized patients
- • Should supplement, not replace, clinical judgment
Special Populations
Elderly Patients
- • May present atypically (falls, confusion, no fever)
- • Higher mortality at all CURB-65 scores
- • Consider aspiration pneumonia
- • Assess functional status and goals of care
Immunocompromised
- • Broader differential (PJP, CMV, Aspergillus)
- • Lower threshold for admission
- • May need empiric coverage for opportunistic infections
- • Consider early bronchoscopy
COPD Patients
- • Distinguish from acute exacerbation
- • Cover for H. influenzae, M. catarrhalis
- • Consider Pseudomonas if severe COPD or recent hospitalization
- • Optimize bronchodilators and steroids
Healthcare-Associated
- • Recent hospitalization/nursing home
- • Broader antibiotic coverage needed
- • Consider MRSA and Pseudomonas
- • May need de-escalation after cultures
CAP Complications to Monitor
Pulmonary Complications
- • Parapneumonic effusion/empyema
- • Lung abscess
- • ARDS
- • Respiratory failure
- • Necrotizing pneumonia
Systemic Complications
- • Sepsis and septic shock
- • Acute kidney injury
- • Cardiac events (MI, arrhythmias)
- • Multi-organ dysfunction
- • Venous thromboembolism
Related Scoring Systems
- CURB-65: C + U + R + B + 65 (0-5 points)
- CRB-65: C + R + B + 65 (0-4 points, no BUN)
- PSI/PORT: More detailed 20-variable score
- SMART-COP: Predicts need for intensive respiratory support
- A-DROP: Japanese modification of CURB-65
Recommended Diagnostic Workup
All Patients
- • Chest X-ray
- • Pulse oximetry
- • CBC, BMP
- • Blood cultures (inpatient)
Severe CAP
- • Sputum culture and Gram stain
- • Legionella and pneumococcal urinary antigens
- • Procalcitonin (if available)
- • ABG if hypoxic
Selected Patients
- • CT chest (if CXR unclear)
- • Respiratory viral panel
- • COVID-19 testing
- • Thoracentesis if effusion
Clinical Scenario Examples
45-year-old, alert, RR 22, BP 130/80, BUN 12 mg/dL
Score: 0 - Outpatient treatment appropriate
68-year-old, alert, RR 32, BP 115/70, BUN 24 mg/dL
Score: 3 (Age + RR + BUN) - Admit to hospital
72-year-old, confused, RR 34, BP 85/55, BUN 32 mg/dL
Score: 5 - ICU admission, consider severe CAP protocol
30-Day Mortality by CURB-65 Score
0
0.6%
1
2.7%
2
6.8%
3
14%
4
27%
5
57%
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