Calc Function

    • Calcs that help predict probability of a diseaseDiagnosis
    • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
    • Disease is diagnosed: prognosticate to guide treatmentPrognosis
    • Numerical inputs and outputsFormula
    • Med treatment and moreTreatment
    • Suggested protocolsAlgorithm





    Chief Complaint


    Organ System


    Patent Pending

    PSI/PORT Score: Pneumonia Severity Index for CAP

    Estimates mortality for adult patients with community-acquired pneumonia.
    When to Use
    Why Use


    Please fill out required fields.

    Next Steps
    Creator Insights


    While many pneumonias are actually viral in nature, typical practice is to provide a course of antibiotics given the pneumonia may be bacterial.

    Disposition (inpatient vs. outpatient) often dictates further care and management -- including lab testing, blood cultures, etc.


    Step 1:

    • If the patient is >50 years of age, assign to risk class II - V and proceed to step 2.
    • If the patient is <50 years of age, but has a history of neoplastic disease, congestive heart failure, cerebrovascular disease, renal disease or liver disease, assign to risk class II - V and proceed to step 2.
    • If the patient has an altered mental status, pulse ≥ 125/minute, respiratory rate ≥ 30/minute, systolic blood pressure ≤ 90 mm Hg, or temperature < 35° C or ≥ 40° C, assign to risk class II - V and proceed to step 2
    • If none of the above apply, assign to risk class I = low risk.

    Step 2:

    • Assign points based on age, gender, nursing home residence, co-morbid illness, physical examination findings, and laboratory and radiographic findings as listed above.
    • Point distribution:
    ≤70Low riskOutpatient care
    71-90Low riskOutpatient vs. Observation admission
    91-130Moderate riskInpatient admission
    >130High riskInpatient admission

    Critical Actions

    For patients scoring high on PSI, it would be prudent to ensure initial triage has not missed the presence of sepsis. Evaluation of SIRS criteria would be beneficial.

    Content Contributors