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

    RIPASA Score for Acute Appendicitis

    Diagnoses appendicitis with lab values and clinical findings, especially for Asian populations.
    When to Use
    Why Use

    Patients being evaluated for acute appendicitis.

    • RIPASA is a scoring system for diagnosing appendicitis.
      • Similar to the Alvarado Score, it typically provides a quantitive value for a clinician's clinical gestalt of appendicitis.
    • It is very accurate for the diagnosis of appendicitis when above a point threshold - typically above 7.5 points.

    Points to keep in mind:

    • It has been most widely studied in Asian populations (Singapore, India) and less so in Western populations.
    • Because it was developed in Singapore which has a large number of foreign nationals, the “Foreign national registration identity card” was included in the score as it was found to have some predictive capacity. This is harder to apply to other populations.

    Negative appendectomies were relatively common in the RIPASA study cohorts, suggesting that use of the score might have reduced unnecessary surgeries while missing few with appendicitis.

    Demographic Information


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    Next Steps
    Creator Insights


    In settings where advanced imaging is used more liberally, the performance of the RIPASA Score is unclear, and no study has yet assessed its impact when applied clinically.


    We are unaware of validated management algorithms using the RIPASA Score.

    Critical Actions

    The RIPASA Score integrates and thus requires a number of laboratory test results and historical features, and while accuracy is high in initial studies, a larger more rigorous validation and/or implementation study would be very useful.

    Dr. William Chong

    About the Creator

    William Chong, MD, MBBS, BSc, is a cardiothoracic surgeon at RIPAS Hospital in Bandar Seri Begawan in Singapore. He is an active researcher in his field as well as in general surgery.

    To view Dr. William Chong's publications, visit PubMed