What is the PSI/PORT score?

The Pneumonia Severity Index (PSI) was developed by Fine et al. (1997) as part of the Pneumonia Patient Outcomes Research Team (PORT) study. It assigns weighted points to 20 demographic, comorbidity, physical exam, and lab variables to predict 30-day mortality in community-acquired pneumonia.

What are the PSI risk classes?

Class I (age ≤50, no comorbidities/abnormal findings): 130 pts): 29.2%.

When should I admit a patient based on PSI?

Classes I and II can typically be treated as outpatients. Class III warrants a short observation stay or outpatient with close follow-up. Classes IV and V generally require hospitalization; Class V often requires ICU-level care.

Is PSI or CURB-65 better?

Both are validated tools. PSI is more complex (20 variables) and better at identifying low-risk patients for outpatient care. CURB-65 is simpler (5 variables) and more practical for rapid triage. Many guidelines recommend PSI for detailed risk stratification.

Does this calculator replace clinical judgment?

No. The PSI/PORT score is a decision support tool. Clinical factors such as social support, ability to take oral medications, oxygen saturation, and the clinician's overall assessment must always be considered alongside the score.

PSI / PORT Score Calculator (Pneumonia Severity)

Enter patient demographics and clinical findings to get the PSI/PORT risk class (I–V) and estimated 30-day mortality for community-acquired pneumonia.

Fill in patient data and press Calculate to see the PSI risk class.

Risk Class Reference

Class	Points	Mortality	Setting
I	Age ≤50*	0.1%	Outpatient
II	≤ 70	0.6%	Outpatient
III	71–90	2.8%	Observe
IV	91–130	8.2%	Inpatient
V	> 130	29.2%	Inpatient/ICU

*Class I: age ≤50 with no comorbidities and no abnormal findings.

Summary

Enter patient demographics and clinical findings to get the PSI/PORT risk class (I–V) and estimated 30-day mortality for community-acquired pneumonia.

How it works

Age points are assigned first: age in years for men, age minus 10 for women.
Nursing home residence adds 10 points.
Five comorbid conditions each add 10–30 points if present.
Five abnormal physical exam findings add 10–20 points each.
Seven laboratory or imaging abnormalities add 10–30 points each.
Total points map to Risk Class I–V, each with a 30-day mortality estimate.

Use cases

Determine inpatient vs. outpatient management of CAP.
Triage pneumonia patients in the emergency department.
Support ICU admission decisions for high-risk patients.
Educate medical students on evidence-based severity scoring.
Document clinical decision rationale in hospital notes.

PSI / PORT Score Calculator (Pneumonia Severity)

Patient Demographics

Demographic Risk Factor

Comorbid Conditions

Physical Exam Findings

Laboratory & Imaging Findings