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PSI/PORT Pneumonia Severity Index Calculator

Score age, comorbidities, vitals, and labs into a Pneumonia Severity Index, then get the PSI risk class (I to V) and 30-day mortality estimate for CAP.

PSI/PORT Pneumonia Severity Index

Demographics

Adds 1 point per year (women have 10 points subtracted).

Comorbidities

Physical examination

New disorientation, stupor, or coma.

Adds 20 points at 30 or more.

Adds 20 points below 90.

Adds 15 points below 35 °C (95 °F) or at 40 °C (104 °F) and above.

Adds 10 points at 125 or more.

Laboratory and imaging

Leave a field blank if the test was not done. A blank value is scored as normal and adds no points.

Adds 30 points below 7.35.

Adds 20 points at 30 or more (urea about 11 mmol/L).

Adds 20 points below 130.

Adds 10 points at 250 or more.

Adds 10 points below 30.

Adds 10 points below 60 (or O2 saturation below 90%).

PSI/PORT risk class

Class III

Low risk

30-day mortality

0.9%

Fine 1997 validation cohort

Total points

80

Step-2 point total

Recommended site of care

Observation unit or brief inpatient stay

Borderline low risk. Estimated 30-day mortality is about 0.9%. Consider an observation unit or brief inpatient stay, especially when oxygenation, oral intake, or social support is uncertain.

Score breakdown

Demographics

  • Age and sex (70 years, male)+70
  • Nursing home resident (No)0

Comorbidities

  • Neoplastic disease (No)0
  • Liver disease (No)0
  • Congestive heart failure (Yes)+10
  • Cerebrovascular disease (No)0
  • Renal disease (No)0

Physical examination

  • Altered mental status (No)0
  • Respiratory rate (22 breaths/min)0
  • Systolic blood pressure (112 mmHg)0
  • Temperature (98.6 °F (37.0 °C))0
  • Pulse (92 beats/min)0

Laboratory and imaging

  • Arterial pH (7.40)0
  • Blood urea nitrogen (18 mg/dL)0
  • Sodium (138 mmol/L)0
  • Glucose (110 mg/dL)0
  • Hematocrit (42 %)0
  • Arterial PaO2 (76 mmHg)0
  • Pleural effusion (No)0

Medical disclaimer

This tool is for educational use only and is not a substitute for professional medical advice, diagnosis, or treatment. The PSI/PORT score is one input into the assessment of community-acquired pneumonia in adults and never replaces clinical judgment, vital-sign trends, social circumstances, or local protocols. Decisions about admission, antibiotics, and intensive-care referral belong with a qualified clinician.

Frequently Asked Questions about the PSI/PORT Pneumonia Severity Index Calculator

What is the PSI/PORT score?
The Pneumonia Severity Index (PSI), also called the PORT score, estimates the 30-day risk of death for adults with community-acquired pneumonia. It adds points for age, sex, five comorbidities, five physical-exam findings, and seven lab or imaging results, then sorts patients into risk classes I through V. Fine and colleagues published it in 1997 to help decide who can safely be treated at home.
How do the points map to a risk class?
Class I comes from a Step 1 screen: a patient 50 or younger with no listed comorbidity and no exam abnormality. Everyone else is scored in Step 2, where the point total sets the class. A total of 70 or fewer is Class II, 71 to 90 is Class III, 91 to 130 is Class IV, and more than 130 is Class V. A higher class means higher predicted mortality.
What 30-day mortality does each class predict?
In the original validation cohort, 30-day mortality was about 0.1% for Class I, 0.6% for Class II, 0.9% for Class III, 9.3% for Class IV, and 27% for Class V. Classes I and II usually support outpatient care, Class III often warrants brief observation, and Classes IV and V generally call for hospital admission.
Do I have to enter every lab value?
No. Age and sex are required, but any vital sign or lab you leave blank is treated as normal and adds no points, which mirrors how the index handles an undocumented finding. Enter the values you have now, and add more as results return to refine the score. Any value you do enter must be a plausible number, or the score will not display.
Why are 10 points subtracted for women?
The original model found that, at the same age, women with community-acquired pneumonia had lower 30-day mortality than men. The rule reflects this by using age in years for men and age minus 10 for women. The deduction applies only to the Step 2 point total, not to the Step 1 screen, which uses raw age above 50.
Is this calculator medical advice?
No. This tool is for education only and is not a substitute for professional medical advice, diagnosis, or treatment. The PSI/PORT score is one input among many and does not replace clinical judgment, vital-sign trends, or local protocols. Always have a qualified clinician make decisions about admission, antibiotics, and intensive care.

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