Patients with inflammatory axial spondyloarthritis according to the assessment group in ankylosing spondylitis (ASAS) criteria (8) and active disease assessed by a physician are recruited in the outpatient clinics of the rheumatology departments, provided that the patient under normal circumstances is expected to benefit from TNF-alpha inhibitor treatment and full fill the criteria for treatment. Screening with a view to participating in the study is carried out in accordance with the inclusion and exclusion criteria. Oral and written patient information about the study, the patient's signing of the informed consent form and the signing of the patient's power of attorney in accordance with the study protocol are also a condition for the inclusion. The including physician will ensure that a potential participant is informed about the right to at least 1 hour's reflection time and the right to have a friend/family member present at the information interview.