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

    GAP Index for Idiopathic Pulmonary Fibrosis (IPF) Mortality

    Provides 1, 2, and 3-year mortality estimates for IPF patients.
    When to Use
    Why Use

    1, 2, and 3-year prognostication for IPF patients needing lung transplantation.

    • The GAP index is more sensitive, but less specific, than the the du Bois Score for predicting mortality.
    • The external validation concludes that the GAP index correlates well with 1-year mortality but NOT 3-year mortality.

    Simple, externally validated, scoring system using readily available baseline parameters.


    Please fill out required fields.

    Next Steps
    Creator Insights


    Higher GAP stages and scores correspond to a greater need for transplantation and other treatments.

    Dr. Brett Ley

    About the Creator

    Brett Ley, MD, is a clinical fellow in the pulmonology department at UCSF School of Medicine. He is an active researcher on lung pathology with 2 active NIH grants and multiple published and peer reviewed papers. Dr. Ley’s research interests include interstitial lung diseases and prediction modeling.

    To view Dr. Brett Ley's publications, visit PubMed

    About the Creator
    Dr. Brett Ley