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Ann Rheum Dis 2002;61:367-369 doi:10.1136/ard.61.4.367
  • Concise report

Rapid detection of autoantibodies to dsDNA with the particle gel immunoassay (ID-PaGIA)

  1. A Seltsam1,
  2. P Schwind2,
  3. K Abraham3,
  4. F Hiepe4,
  5. S Cygan2,
  6. I Aebischer2,
  7. A Salama1
  1. 1Institute of Transfusion Medicine, Charité University Hospital/Virchow Clinic, Humboldt University Berlin, Germany
  2. 2DiaMed SA, Cressier sur Morat, Switzerland
  3. 3Institute of Laboratory Medicine and Pathobiochemistry, Charité University Hospital/ Virchow Clinic
  4. 4Department of Rheumatology and Clinical Immunology, Charité University Hospital
  1. Correspondence to:
    Professor A Salama, Institute of Transfusion Medicine, Charité Campus Virchow-Klinikum, Medizinische Fakultät der Humboldt-Universität zu Berlin, Augustenburger Platz 1, 13353 Berlin, Germany;
    abdulgabar.salama{at}charite.de
  • Accepted 26 October 2002

Abstract

Objective: To describe a new particle agglutination test for the detection of autoantibodies to double stranded DNA (dsDNA).

Patients and methods: Serum samples were collected from 40 unselected healthy blood donors and 200 patients with systemic lupus erythematosus (SLE) or a positive antinuclear antibody screen, or both. The samples were tested in the presence of red high density polystyrene particles coated with purified human dsDNA using the gel technique (Micro Typing System, ID-PaGIA, particle gel immunoassay). The results were compared with those obtained by the two standard anti-dsDNA antibody detection methods, Crithidia luciliae immunofluorescence test (CLIF) and enzyme linked immunosorbent assay (ELISA).

Results: The three anti-dsDNA assays exhibited an overall agreement of 87% and significant correlation with each other (p<0.0001). In the SLE group (n=71), 45 patients (63%) were found to be positive by ID-PaGIA compared with only 11/129 (9%) patients in the non-SLE group. Thus the ID-PaGIA had a sensitivity of 63%, and a specificity of 92% for SLE. In comparison, the standard detection methods showed sensitivities of 62% (CLIF) and 70% (ELISA) and specificities of 99% (CLIF) and 84% (ELISA) for SLE. Anti-dsDNA reactivity in the agglutination assay correlated closely with the quantities of antibody obtained by CLIF (r=0.81, p<0.0001) and ELISA (r=0.73, p<0.0001).

Conclusions: The new particle gel agglutination test is a sensitive and specific immunoassay. It is a simple test procedure that might be well suited as a rapid screening method.

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