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The Ankylosing Spondylitis Disease Activity Score (ASDAS) is a measure of axial spondyloarthritis (axSpA) disease activity with validated cut-offs endorsed by the Assessment of SpondyloArthritis international Society (ASAS) and Outcome Measures in Rheumatology (OMERACT).1 2 In the 2016 update of the ASAS-European League Against Rheumatism (EULAR) management recommendations for axSpA, it is recommended that biological disease-modifying antirheumatic drugs should be considered in patients with persistently high disease activity despite conventional treatments, and that the preferred measure to define active disease should be the ASDAS (ASDAS of at least 2.1, ie, high disease activity).3 The 2017 update of treat-to-target recommendations in axial and peripheral SpA recommends that the treatment target should be inactive disease/clinical remission and that low/minimal disease activity may be an alternative treatment target. The same recommendations state that the preferred measure to define the target in axSpA is the ASDAS.4
ASDAS cut-offs for disease activity states are 1.3, separating ‘inactive disease’ from ‘moderate disease activity’, 2.1, …
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