RT Book, Section A1 Manno, Rebecca L. A1 Yazdany, Jinoos A1 Tarrant, Teresa K. A1 Kwan, Mildred A2 Papadakis, Maxine A. A2 McPhee, Stephen J. A2 Rabow, Michael W. A2 McQuaid, Kenneth R. SR Print(0) ID 1193125924 T1 Axial Spondyloarthritis (Ankylosing Spondylitis) T2 Current Medical Diagnosis & Treatment 2023 YR 2023 FD 2023 PB McGraw-Hill Education PP New York, NY SN 9781264687343 LK accessmedicine.mhmedical.com/content.aspx?aid=1193125924 RD 2024/04/24 AB ESSENTIALS OF DIAGNOSISChronic low backache and stiffness in young adults, worst in the morning.Progressive limitation of back motion and chest expansion.Transient (50%) or persistent (25%) peripheral arthritis.Anterior uveitis in 20–25%.Diagnostic radiographic changes in sacroiliac joints.Negative serologic tests for rheumatoid factor and anti-CCP antibodies.HLA-B27 testing is most helpful when there is an intermediate probability of disease.