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©2013 UpToDate ® Print Email Assessment of disease impact in ankylosing spondylitis in clinical practice Domain Instrument Function BASFI, file://www.spondylitis.org Pain VAS, last week, spinal pain, at night, caused by AS and VAS, last week, peripheral joint pain caused by AS Spinal mobility Chest expansion, modified Schöber index, and occiput to wall distance Patient global VAS, last week Stiffness Duration of morning stiffness, spine, last week Peripheral joints and entheses Number of swollen joints (44 joint count) validated enthesis index* Acute phase reactants ESR or CRP Fatigue VAS BASFI: Bath ankylosing spondylitis functional index; VAS: visual analog scale (0 - 100 mm); ESR: erythrocyte sedimentation rate; CRP: C reactive protein * Braun, J, Pham, T, Sieper, J, et al. Ann Rheum Dis 62:127, 2003.