Antinuclear autoantibodies: discordance among four different assays

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Detection of antinuclear antibodies (ANAs) is of paramount importance for diagnosis and assessment of autoimmune diseases (ADs), but may vary depending on the method used. Therefore, we aimed to compare three different line immunoassays (LIAs) for ANAs testing in order to simultaneously evaluate their concordance with the results obtained by a well known and widely used ELISA. Sera from women with established systemic lupus erythematosus (SLE, n=62) and Sjogren’s syndrome (SS, n=28) were examined. Patients with SLE had an average age of 48.7 years (IQR 36.8–57.0) with a disease duration of 14.8 years (IQR 9.0–18.0). Patients with SS had an average age of 62.1 years (IQR 55.5–71.0) with a duration of disease of 13.1 years (IQR 8.3–17).

Table 1 shows the results from the two-by-two comparison for the four techniques. Different levels of agreement were observed among the assays. In general, they were deficient. The analysis showed only one ‘strong’ level of agreement between ELISA and IMTEC-ANA-LIA Maxx for anti-Ro measurement. Out of 39 comparisons, 14 did …
Original languageEnglish (US)
JournalAnnals of the Rheumatic Diseases
Issue number1
StatePublished - Jan 1 2020

All Science Journal Classification (ASJC) codes

  • Rheumatology
  • Immunology and Allergy
  • Immunology
  • Biochemistry, Genetics and Molecular Biology(all)

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