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PSI/PORT Score (CAP)

Age/sex contribution plus weighted comorbidities, vitals, and labs. Unchecked labs/exam items are treated as “not abnormal” for the Class I screen (teaching default).

Calculator

Age (years)

Sex (age points)

Male (age = age points) Female (age points = max(0, age − 10))

Check each box only if the abnormality is present. Nursing home and each listed disease add fixed points.

History / setting Nursing home resident (+10) Neoplastic disease (+30) Liver disease (+20) Congestive heart failure (+10) Cerebrovascular disease (+10) Renal disease (+10)

Examination Altered mental status (+20) Respiratory rate ≥30/min (+20) Systolic BP <90 mmHg (+20) Temperature <35°C (95°F) OR ≥40°C (104°F) (+15) Pulse ≥125/min (+10)

Laboratory / imaging

Check only if measured and abnormal per PSI thresholds below.

Arterial pH <7.35 (+30) BUN ≥30 mg/dL (+20) Sodium <130 mEq/L (+20) Glucose ≥250 mg/dL (+10) Hematocrit <30% (+10) PaO2 <60 mmHg or SpO2 <90% (+10) Pleural effusion on imaging (+10)

PSI result

How it works

The Pneumonia Severity Index (PSI/PORT) stratifies adults with community-acquired pneumonia using demographics, comorbidities, examination, and laboratory/radiographic findings. Class I identifies a small low-risk group without summing the full score; otherwise total points map to Classes II–V.

Limits

HIV, pregnancy, ICU-level support, and sepsis definitions are not modeled. Mortality percentages are historical; current outcomes depend on vaccination, antibiotics, and site of care. Verify thresholds against your reference.

Educational tool only—not for diagnosis or treatment decisions.

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