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    Crohn's Disease Activity Index (CDAI)

    Determines the current severity of Crohn’s disease.
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    INSTRUCTIONS

    Signs, symptoms, and history should be based on the past 7 days. Note: for abdominal pain and general well-being ratings, this calculator uses an average rating per day over the past 7 days. For stools, use the total number of soft/liquid stools over the past 7 days.
    When to Use
    Pearls/Pitfalls
    Why Use

    Adults with active Crohn’s disease.

    • The Crohn's Disease Activity Index (CDAI) allows quantitation and tracking of disease activity in adults with Crohn’s disease.
    • The CDAI may have wide variation in definitions and scoring in real world use.
    • Lab variations of “normal” hematocrit in men and women can often lead to markedly different CDAI scores; similarly, changes in weight can lead to score differences as well.

    Crohn’s disease is a complex and multifactorial entity. Assessment of disease activity and quality of life are difficult to quantify — a standardized, accurate tool helps compare severity across patients, as well as track individual patients over time.

    lbs
    lbs
    Female
    Male
    stools
    rating
    rating
    No
    0
    Yes
    +1
    No
    0
    Questionable
    +2
    Definite
    +5
    %
    Extraintestinal Findings/Complications
    No
    0
    Yes
    +1
    No
    0
    Yes
    +1
    No
    0
    Yes
    +1
    No
    0
    Yes
    +1
    No
    0
    Yes
    +1
    No
    0
    Yes
    +1

    Result:

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    Next Steps
    Evidence
    Creator Insights

    Advice

    The CDAI is the de facto gold standard and is used in studies worldwide.

    Management

    • Multiple algorithms use the score, though we are not aware of any that are validated based on outcomes.
    • Refer to ACG guidelines for management of acute diarrheal infections in adults.

    Critical Actions

    Requires laboratory values, detailed history-taking and a 7-day patient diary of symptoms.

    About the Creator
    Dr. William R. Best
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