Pneumonia Severity Index — 30-day mortality risk in community-acquired pneumonia
Age (years)
Sex
Male
Female
Nursing-home resident
Neoplastic disease
Liver disease
Congestive heart failure
Cerebrovascular disease
Renal disease
Altered mental status
Respiratory rate ≥ 30/min
Systolic BP < 90 mmHg
Temperature < 35 °C or ≥ 40 °C
Pulse ≥ 125/min
Arterial pH < 7.35
BUN ≥ 30 mg/dL (urea ≥ 11 mmol/L)
Sodium < 130 mmol/L
Glucose ≥ 250 mg/dL (≥ 14 mmol/L)
Haematocrit < 30%
PaO₂ < 60 mmHg or SaO₂ < 90%
Pleural effusion on imaging
Enter the patient's age to calculate
Evidence
Original publication
Fine MJ, Auble TE, Yealy DM, et al. A prediction rule to identify low-risk patients with community-acquired pneumonia. Derived and validated the Pneumonia Severity Index (PORT score): a two-step rule assigning Risk Classes I–V, with 30-day mortality 0.1–0.4% in Classes I–II and 27–31% in Class V.
New England Journal of Medicine, 1997
Open source
Guideline
The 2019 ATS/IDSA community-acquired pneumonia guideline recommends the PSI (over CURB-65) as the preferred severity tool to support the decision on outpatient versus inpatient treatment, together with clinical judgement.
Last reviewed: 2026-09
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MedScore is an educational and clinical decision-support tool. It does not provide a diagnosis, a treatment, or a drug-dosing recommendation, and it does not replace clinical judgement or local guidelines. Confirm every result against the original source before acting on it. The treating clinician remains responsible for all decisions.