International journal of rheumatic diseases
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Anti-neutrophil cytoplasmic antibodies (ANCA) are associated with small vessel vasculitis now termed 'ANCA associated vasculitis' (AAV). ANCAs are reported in diverse diseases where they have no clinical utility. We carried out an audit in a clinical immunology laboratory and assessed if use of ordering practices could have improved utility of ANCA. ⋯ Reduction in false positive can be achieved by considering only those samples as ANCA positive that test positive both on IIF and ELISA and by following ordering guidelines before requesting ANCA testing, and by use of ordering criteria by clinicians.
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Fibromyalgia syndrome (FMS) is defined as chronic widespread pain that cannot be accounted for by any other medical disorder. Our aim was to explore the prevalence of thyroid autoimmunity in patients with FMS. ⋯ We found a high prevalence of AITD among 207 patients with clinically defined FMS, with TRAb being especially prominent among these patients. Further study is needed to evaluate changes in thyroid function among FMS patients with AITD.