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      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

    Mayo Score / Disease Activity Index (DAI) for Ulcerative Colitis

    Assesses severity of ulcerative colitis.
    When to Use
    Why Use
    • Patients with known ulcerative colitis, particularly when considering changing, adding, or stopping a UC medication; this is not a tool to diagnose ulcerative colitis.
    • The Mayo Score is the most commonly used scoring system for UC in clinical trials and routine practice (Paine 2014).
    • The Mayo Score for Ulcerative Colitis was developed to standardize the severity of a patient's ulcerative colitis (UC) symptoms, which is particularly helpful to assess response to treatment over time.
    • The Mayo Score for Ulcerative Colitis was originally devised in 1987 for a clinical trial for pH dependent 5-ASA (Asacol) at the Mayo Clinic.
    • Comprised of 4 parts: stool frequency, rectal bleeding, endoscopic findings and physician’s global assessment, each scored from 0-3.
    • The physician’s global assessment accounts for other signs/symptoms including abdominal pain, physical exam findings (extraintestinal manifestations, fever, tachycardia), functional status, and the patient’s overall sense of well being.
    • Total scores range from 0-12 with higher scores indicating increased severity of disease.
    • Response to therapy is defined differently in each trial, but most use a decrease of 3 or more points.
      • Remission is often defined as a total score of 2 or less with all individual categories ≤1. Occasionally, remission is defined stringently as a score of 0.
      • Most clinical trials define mucosal healing as an endoscopic score of 0 or 1, although numerous other endoscopic scoring systems exist (D’Haens 20074).
    • The “Full” or “Complete” Mayo score incorporates all 4 parts.
    • If endoscopic findings are not available, the remaining 3 categories constitute a “Modified” or “Partial” Mayo score.

    Points to keep in mind:

    • For stool frequency and rectal bleeding, the patient acts as their own point of reference (i.e. number of stools above normal) rather than the absolute number.
    • Critics point out an element of subjectivity in the Physician’s Global Assessment (sense of well being).
    • The score is not designed to predict need for admission or surgical therapy.
    • This is not a tool to diagnose ulcerative colitis, rather a tool to evaluate patients with known UC.
    • Assesses initial disease severity, change in activity over time, and response to treatment.
    • Provides a universal metric to encapsulate disease severity at a given time in a single number.

    Similar calcs:

    • Nearly identical to the UC Disease Activity Index (DAI) devised by Sutherland et al. Both scores were released in 1987 as objective measures to examine the effects of salicylates in UC. Both rely on the same 4 categories but have miniscule differences in their point assignments
    1-2 stools/day more than normal
    3-4 stools/day more than normal
    >4 stools/day more than normal
    Visible blood with stool less than half the time
    Visible blood with stool half of the time or more
    Passing blood alone
    Normal or inactive disease
    Mild disease (erythema, decreased vascular pattern, mild friability)
    Moderate disease (marked erythema, absent vascular pattern, friability, erosions)
    Severe disease (spontaneous bleeding, ulceration)


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    • Not designed to predict need for admission or surgical therapy
    • However, an endoscopic score of 0 is associated with lower risk of colectomy compared to higher scores. (Manginot 2016)

    Critical Actions

    If endoscopic data are not available, the modified Mayo score performs equally well. (Lewis 2008)

    Content Contributors
    About the Creator
    Dr. Kenneth W. Schroeder
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