CURB-65 Pneumonia Severity Score

Predicts 30-day mortality in community-acquired pneumonia using Confusion, Urea >7 mmol/L, Respiratory rate ≥30, low Blood pressure, and age ≥65. Score 0–1 = low risk (outpatient); 2 = moderate (consider admission); 3–5 = high risk (hospital required).

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Predicts 30-day mortality in community-acquired pneumonia using Confusion, Urea >7 mmol/L, Respiratory rate ≥30, low Blood pressure, and age ≥65. Score 0–1 = low risk (outpatient); 2 = moderate (consider admission); 3–5 = high risk (hospital required)

Each component has a specific meaning:

  • Confusion — The confusion recorded for the scenario being assessed.
  • Urea >7 mmol/L — The urea >7 mmol/l recorded for the scenario being assessed.
  • Respiratory rate ≥30 — The respiratory rate ≥30 recorded for the scenario being assessed.
  • Low Blood pressure — The low blood pressure recorded for the scenario being assessed.
  • Age ≥65 — The age ≥65 recorded for the scenario being assessed.

Note: Interpret the curb-65 result against the thresholds and context described above.

How to Use

Enter the Confusion, Urea >7 mmol/L, Respiratory rate ≥30, low Blood pressure, age ≥65 for the scenario you are assessing. Predicts 30-day mortality in community-acquired pneumonia using Confusion, Urea >7 mmol/L, Respiratory rate ≥30, low Blood pressure, and age ≥65. Score 0–1 = low risk (outpatient); 2 = moderate (consider admission); 3–5 = high risk (hospital required). Use the curb-65 result to inform your calculation.

Frequently Asked Questions