PSI/PORT Score Calculator

PSI/PORT Score Calculator for Pulmonology. Class I comes from the initial clinical screen, never a low numerical total alone. After a failed screen, totals <=70, 71-90, 91-130 and >130 assign II-V. Other clinical and practical admission needs remain relevant at every class.

For shared guidance on choosing a tool and documenting results, read the clinical calculator workflow.

How this calculator works

PSI first checks age at most 50, absence of five comorbidities and five abnormal clinical findings. Those meeting this screen are class I. Others receive the original weighted demographic, clinical, laboratory and imaging sum, with class II <=70, III <=90, IV <=130 and V >130.

When to use this calculator

Use in an adult community-acquired pneumonia pathway after diagnosis and clinical assessment. Oxygenation, ability to take treatment, social support, and other admission needs are not replaced by the score.

Inputs used

  • Age (completed years)
  • Sex used by the original model
  • Nursing-home resident
  • Active neoplastic disease
  • Liver disease
  • Congestive heart failure
  • Cerebrovascular disease
  • Renal disease
  • Altered mental status
  • Pulse (/min)
  • Respiratory rate (/min)
  • Systolic pressure (mmHg)
  • Temperature (C)
  • Arterial pH (conditional assessment)
  • BUN (mg/dL) (conditional assessment)
  • Sodium (mmol/L) (conditional assessment)
  • Glucose (mg/dL) (conditional assessment)
  • Hematocrit (%) (conditional assessment)
  • PaO2 below 60 mmHg OR oxygen saturation below 90% (conditional assessment)
  • Pleural effusion (conditional assessment)

Clinical interpretation

Class I comes from the initial clinical screen, never a low numerical total alone. After a failed screen, totals <=70, 71-90, 91-130 and >130 assign II-V. Other clinical and practical admission needs remain relevant at every class.

Worked example

Fictional teaching case. Age (completed years): 68; Sex used by the original model: Male; Nursing-home resident: Yes; Active neoplastic disease: No; Liver disease: No; Congestive heart failure: Yes; Cerebrovascular disease: No; Renal disease: No; Altered mental status: No; Pulse (/min): 90; Respiratory rate (/min): 30; Systolic pressure (mmHg): 110; Temperature (C): 37; Arterial pH: 7.4; BUN (mg/dL): 30; Sodium (mmol/L): 129; Glucose (mg/dL): 100; Hematocrit (%): 40; PaO2 below 60 mmHg OR oxygen saturation below 90%: No; Pleural effusion: No. Result: 148 points. PSI class V. Contributions in assessment order: 68 + 10 + 0 + 0 + 10 + 0 + 0 + 0 + 0 + 20 + 0 + 0 + 0 + 20 + 20 + 0 + 0 + 0 + 0 = 148. This is a risk estimate, not a diagnosis, a personal survival prediction, or an automatic treatment/discharge decision. This CAP prognostic tool is not a severe-CAP ICU criterion or an antibiotic selector.

Limitations and safety notes

Use in adults with community-acquired pneumonia. Labs are required when the initial screen fails; unavailable results cannot be called normal. Clinical assessment, oxygenation and practical safety remain necessary even in class I.

Frequently asked questions

Can a low numeric total alone assign Class I?

No. The original Class I assignment uses a separate preliminary clinical screen.

What can change the meaning of this result?

Use in adults with community-acquired pneumonia. Labs are required when the initial screen fails; unavailable results cannot be called normal. Clinical assessment, oxygenation and practical safety remain necessary even in class I.

References

  • Original PSI derivation. https://pubmed.ncbi.nlm.nih.gov/8995086/
  • Original Fine 1997 paper, initial two-step screen and weighted variables; no figure reproduced. https://www.evidencio.com/uploads/files/models/files/167/0e64d8-Original%20research%20paper%20Fine%20MJ%20et%20al%2C%201997.pdf

Editorial review and citation methodology

Maintained by the Quick Medical Calculator Editorial Team. Content record date: September 9, 2026. A content date is not evidence of independent clinical review. Individual clinical sign-off is not recorded on this page.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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