Q: How does CURB-65 guide disposition decisions?

Score 0–1: low risk, suitable for outpatient treatment. Score 2: consider short hospital admission or closely supervised outpatient care. Score 3–5: severe pneumonia, hospitalize; scores 4–5 should prompt ICU evaluation.

Q: What is CRB-65 and when is it used?

CRB-65 omits the urea criterion (which requires blood work) and can be used in primary care or pre-hospital settings. Score 0: very low risk (outpatient). Score 1–2: increased risk, consider referral. Score 3–4: high risk, urgent hospital admission.

Q: CURB-65 vs PSI / PORT — which should I use?

PSI (PORT) is more complex (20 variables) and better at identifying low-risk patients who can be safely managed as outpatients — the 2019 ATS/IDSA CAP guideline prefers PSI for this reason. CURB-65 uses 5 variables, can be calculated at the bedside with minimal lab dependence (CRB-65 omits urea), and is preferred by BTS and NICE in the UK. In direct comparisons the two scores have similar overall discrimination for 30-day mortality; PSI tends to have higher sensitivity for ICU need, while CURB-65 has higher specificity. The PSI / PORT calculator on this site is at /calculators/psi.

Q: Does CURB-65 apply to hospital-acquired pneumonia (HAP) or VAP?

No. CURB-65 was derived and validated in community-acquired pneumonia and should not be applied to hospital-acquired pneumonia (HAP), ventilator-associated pneumonia (VAP), or healthcare-associated pneumonia. These conditions have different pathogens, mortality, and management — severity for HAP/VAP is more commonly assessed using clinical criteria together with SOFA or APACHE II in the ICU.

Q: What does CURB-65 not capture?

CURB-65 does not include hypoxaemia, lactate, multilobar infiltrates, immunosuppression, or social factors (homelessness, inability to take oral medications, lack of follow-up), all of which may justify admission even at low CURB-65 scores. Conversely, an otherwise healthy patient with a high CURB-65 driven mostly by isolated mental status change from an alternative cause may safely receive less intensive care. The score is a decision aid, not a substitute for clinical assessment.

Question 1

What does each letter in CURB-65 stand for?

Accepted Answer

C = Confusion (new mental confusion), U = Urea >7 mmol/L (BUN >19 mg/dL), R = Respiratory rate ≥30/min, B = Blood pressure (systolic <90 or diastolic ≤60 mmHg), 65 = Age ≥65 years. Each criterion scores 1 point, for a maximum of 5.

Question 2

How does CURB-65 guide disposition decisions?

Accepted Answer

Score 0–1: low risk, suitable for outpatient treatment. Score 2: consider short hospital admission or closely supervised outpatient care. Score 3–5: severe pneumonia, hospitalize; scores 4–5 should prompt ICU evaluation.

Question 3

What is CRB-65 and when is it used?

Accepted Answer

CRB-65 omits the urea criterion (which requires blood work) and can be used in primary care or pre-hospital settings. Score 0: very low risk (outpatient). Score 1–2: increased risk, consider referral. Score 3–4: high risk, urgent hospital admission.

Question 4

CURB-65 vs PSI / PORT — which should I use?

Accepted Answer

PSI (PORT) is more complex (20 variables) and better at identifying low-risk patients who can be safely managed as outpatients — the 2019 ATS/IDSA CAP guideline prefers PSI for this reason. CURB-65 uses 5 variables, can be calculated at the bedside with minimal lab dependence (CRB-65 omits urea), and is preferred by BTS and NICE in the UK. In direct comparisons the two scores have similar overall discrimination for 30-day mortality; PSI tends to have higher sensitivity for ICU need, while CURB-65 has higher specificity. The PSI / PORT calculator on this site is at /calculators/psi.

Question 5

Does CURB-65 apply to hospital-acquired pneumonia (HAP) or VAP?

Accepted Answer

No. CURB-65 was derived and validated in community-acquired pneumonia and should not be applied to hospital-acquired pneumonia (HAP), ventilator-associated pneumonia (VAP), or healthcare-associated pneumonia. These conditions have different pathogens, mortality, and management — severity for HAP/VAP is more commonly assessed using clinical criteria together with SOFA or APACHE II in the ICU.

Question 6

What does CURB-65 not capture?

Accepted Answer

CURB-65 does not include hypoxaemia, lactate, multilobar infiltrates, immunosuppression, or social factors (homelessness, inability to take oral medications, lack of follow-up), all of which may justify admission even at low CURB-65 scores. Conversely, an otherwise healthy patient with a high CURB-65 driven mostly by isolated mental status change from an alternative cause may safely receive less intensive care. The score is a decision aid, not a substitute for clinical assessment.

Score	Severity	Disposition / clinical action
0 – 1	Low (~1.5% 30-d mortality)	Outpatient management with oral antibiotics
2	Moderate (~9.2%)	Consider short hospital admission or supervised outpatient management
3 – 5	High (~22%)	Hospitalise; score 4–5 prompts ICU evaluation

CURB-65 Score

Criteria

About

Formula

Interpretation

References

FAQ

Related Calculators