PSI / PORT Score Calculator
Estimate 30-day mortality risk in community-acquired pneumonia with the Pneumonia Severity Index (PSI), also called the PORT score, and see the risk class that guides outpatient versus inpatient care. Enter age and sex, then tick the comorbidities, examination findings and abnormal labs that apply. A well, young patient with none of these is Risk Class I; otherwise the points sort the patient into classes II–V.
About the Pneumonia Severity Index
The PSI/PORT score estimates 30-day mortality in community-acquired pneumonia to support the admission decision, identifying low-risk patients who can often be treated at home. Source: Fine MJ et al., “A prediction rule to identify low-risk patients with community-acquired pneumonia,” New England Journal of Medicine 1997;336(4):243–250.
Frequently asked questions
What is the PSI / PORT score?
The Pneumonia Severity Index (PSI), from the Pneumonia PORT study, is a prediction rule that stratifies adults with community-acquired pneumonia into five risk classes (I–V) by their estimated 30-day mortality. It is mainly used to help decide who can be treated at home and who needs admission. Mortality prediction is broadly similar to CURB-65, though PSI uses more variables.
How is the score worked out?
It is a two-step rule. Step 1: a patient aged 50 or under with none of five comorbidities (cancer, liver, heart failure, cerebrovascular or renal disease) and a normal examination (mental status, pulse, respiratory rate, blood pressure and temperature) is Risk Class I. Step 2, for everyone else, adds points: age (in years; minus 10 for women), +10 nursing-home resident, comorbidities (cancer +30, liver +20, heart failure/cerebrovascular/renal +10 each), exam findings (altered mental status/respiratory rate ≥30/systolic BP <90 +20 each, temperature <35 or ≥40 °C +15, pulse ≥125 +10) and labs (pH <7.35 +30, BUN ≥30 mg/dL/sodium <130 +20 each, glucose ≥250/haematocrit <30%/PaO₂ <60 mmHg/pleural effusion +10 each).
What are the risk classes and mortality?
Class I and II (≤70 points) have low 30-day mortality (about 0.1% and 0.6%) and can usually be treated as outpatients. Class III (71–90) is roughly 0.9–2.8% and may suit a short admission or observation. Class IV (91–130, about 8–9%) and Class V (over 130, roughly 27–31%) are managed as inpatients, with Class V often needing intensive care. These figures come from the original derivation and validation cohorts.
PSI or CURB-65 — which should I use?
Both are validated. PSI is more sensitive for identifying low-risk patients and is better studied for the discharge decision, but it needs more inputs including labs and a blood gas. CURB-65 is quicker at the bedside. Many services use PSI to support safe outpatient treatment and CURB-65 as a rapid screen. This site has a separate CURB-65 calculator.
What are the limits of the score?
PSI weights age heavily, so it can under-rate severe pneumonia in younger patients, and it does not capture social factors, hypoxia trends or the ability to take oral medicines and cope at home — all of which affect the admission decision. It is a support tool, not a rule that overrides judgement. This calculator is an educational reference, not medical advice.
This is a reference tool, not a diagnosis or medical advice. Results depend on the laboratory, assay and clinical context, and reference intervals vary between labs and by age and sex — always read your result against the range printed on your own report and discuss it with a qualified healthcare professional.
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