The Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), the Bath Ankylosing Spondylitis Functional Index (BASFI), the Bath Ankylosing Spondylitis Metrology Index (BASMI), the Ankylosing Spondylitis Disease Activity Score (ASDAS), the Maastricht Ankylosing Spondylitis Enthesis score (MASES), the erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP) levels are used to evaluate the disease activity and morbidity of ankylosing spondylitis (AS) [2, 3]. Here, CRP is linked to ankylosing spondylitis.