This is an unprecedented time. It is the dedication of healthcare workers that will lead us through this crisis. Thank you for everything you do.

      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

    Disease

    Select...

    Specialty

    Select...

    Chief Complaint

    Select...

    Organ System

    Select...

    Patent Pending

    Simple Disease Activity Index (SDAI) for Rheumatoid Arthritis

    Determines severity of rheumatoid arthritis using clinical and laboratory data.
    When to Use
    Pearls/Pitfalls
    Why Use
    • All patients with rheumatoid arthritis.
    • Reassessing patients after starting a new medication for RA.
    • Assessment of disease activity in rheumatoid arthritis (RA) should be viewed as a dynamic, on-going process; many experts recommend assessing it at every patient visit.
    • Early treatment is important for optimal RA outcomes, and the SDAI can help give a gestalt view of a patient's disease severity and activity.
    • The Clinical Disease Activity Index (CDAI) provides similar information and correlates well but without the need for laboratory data (CRP).
    • The Simplidied Disease Activity Index (SDAI) provides an excellent overview of a patient's disease severity (it correlates closely with the CDAI which does not require laboratory data) and the DAS-28.
    • The SDAI can also help guide therapy based on severity of disease.
    joints
    joints
    mg/L
    0.0 - Very well
    0
    0.5
    +0.5
    1.0
    +1
    1.5
    +1.5
    2.0
    +2
    2.5
    +2.5
    3.0
    +3
    3.5
    +3.5
    4.0
    +4
    4.5
    +4.5
    5.0
    +5
    5.5
    +5.5
    6.0
    +6
    6.5
    +6.5
    7.0
    +7
    7.5
    +7.5
    8.0
    +8
    8.5
    +8.5
    9.0
    +9
    9.5
    +9.5
    10.0 - Very poor
    +10
    0.0 - Very well
    0
    0.5
    +0.5
    1.0
    +1
    1.5
    +1.5
    2.0
    +2
    2.5
    +2.5
    3.0
    +3
    3.5
    +3.5
    4.0
    +4
    4.5
    +4.5
    5.0
    +5
    5.5
    +5.5
    6.0
    +6
    6.5
    +6.5
    7.0
    +7
    7.5
    +7.5
    8.0
    +8
    8.5
    +8.5
    9.0
    +9
    9.5
    +9.5
    10.0 - Very poor
    +10

    Result:

    Please fill out required fields.

    Next Steps
    Evidence
    Creator Insights
    Dr. Josef Smolen

    About the Creator

    Josef Smolen, MD, is a professor of internal medicine and chairman of the Division of Rheumatology at the Medical University of Vienna. Previously, he was president of the European League Against Rheumatism (EULAR), of the Austrian Society of Rheumatology and of the Austrian Society of Immunology. Dr. Smolen focuses on pathogenetic and outcomes research in rheumatological disease.

    To view Dr. Josef Smolen's publications, visit PubMed

    Are you Dr. Josef Smolen? Send us a message to review your photo and bio, and find out how to submit Creator Insights!
    MDCalc loves calculator creators – researchers who, through intelligent and often complex methods, discover tools that describe scientific facts that can then be applied in practice. These are real scientific discoveries about the nature of the human body, which can be invaluable to physicians taking care of patients.
    About the Creator
    Dr. Josef Smolen
    Are you Dr. Josef Smolen?
    Guidelines