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We have read the letter by Bossuyt and Fieuws entitled ‘Detection of anti-nuclear antibodies, added-value of solid phase assay?’ with great interest.1 In this letter, the authors described a comparison between anti-nuclear antibodies (ANA) performed by indirect immunofluorescent assay (IIFA) and by an automated method (fluoroenzymeimmunoassay; EliA CTD screen, Thermo Fisher) using samples obtained from patients with systemic lupus erythematosus (SLE), systemic sclerosis, Sjögren's syndrome (SS) and healthy controls. The authors concluded that the favourable method for ANA detection is disease dependent and that combining IIFA with solid phase assay can increase the diagnostic accuracy.
These points, raised by Bossuyt and Fieuws, may be regarded in the perspective of the international recommendations for ANA detection that we have recently published.2 Indeed, our recommendations support the use of IIFA as …
Handling editor Tore K Kvien
Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.
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