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Related Experiment Videos

Is high titre ANA specific for connective tissue disease?

J H Vaile1, L Dyke, R Kherani

  • 1Division of Rheumatology, University of Alberta, Edmonton, Canada.

Clinical and Experimental Rheumatology
|August 19, 2000
PubMed
Summary

A high titre antinuclear antibody (ANA) test is not specific for connective tissue diseases (CTD). Many patients with high-titre ANA results do not have a CTD diagnosis, suggesting higher cutoffs may not improve diagnostic certainty.

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Area of Science:

  • Immunology
  • Rheumatology
  • Clinical Diagnostics

Background:

  • Antinuclear antibody (ANA) testing is a sensitive but not specific marker for systemic lupus erythematosus and other connective tissue diseases (CTD).
  • High-titre ANA results are often interpreted as indicative of CTD, but their diagnostic specificity requires further investigation.

Purpose of the Study:

  • To evaluate the diagnostic specificity of high-titre ANA results for connective tissue diseases (CTD).
  • To determine if a higher ANA titre cutoff offers improved diagnostic certainty compared to screening titres.

Main Methods:

  • Retrospective review of medical records for patients with high-titre ANA (defined as 4 dilutions above screening) over a 6-month period.
  • Analysis of diagnoses, specialist consultations, and results of antibodies to extractable nuclear antigens (ENA) and native DNA tests.

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Main Results:

  • Of 320 reviewed patient records with high-titre ANA, 35% were diagnosed with CTD.
  • A significant proportion of patients (29%) had no specific diagnosis recorded, and CTD was not suggested by available data.
  • Positive anti-ENA or anti-DNA antibodies were found in 22% and 8% of sera, respectively.

Conclusions:

  • A substantial percentage of patients with high-titre ANA lack a CTD diagnosis at the time of testing.
  • Increasing the reporting cutoff for ANA may not sufficiently enhance specificity to be a valuable diagnostic tool on its own.