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Comment on: ‘Diagnostic delay in patients with rheumatoid arthritis, psoriatic arthritis and ankylosing spondylitis: results from the Danish nationwide DANBIO registry’ by Sørensen et al
  1. Mark Sykes1,
  2. Helen Doll2,
  3. Karl Gaffney1
  1. 1Department of Rheumatology, Norfolk & Norwich University Hospitals NHS Foundation Trust, Norwich, UK
  2. 2Oxford Outcomes, ICON Commercialisation and Outcomes, Oxford, UK
  1. Correspondence to Dr Mark Sykes, Department of Rheumatology, Norfolk & Norwich University Hospitals NHS Foundation Trust, Colney Lane, Norwich NR4 7UY, UK; mark.sykes{at}

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Diagnostic delay is one of the key clinical challenges in ankylosing spondylitis (AS). Recent publications have continued to show an average delay of 8–10 years.1 ,2 We read with interest that the diagnostic delay in the DANBIO cohort had apparently reduced from 66 months in 2000 to 4 months in 2011.3

In our opinion, however, there is a potential methodological problem with this paper. The authors have implied that they have a prospective study following …

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  • Competing interests None.

  • Provenance and peer review Not commissioned; internally peer reviewed.

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