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Methods of choice for diagnostic antinuclear antibody (ANA) screening : Benefit of adding antigen-specific assays to immunofluorescence microscopy
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- Dahle, Charlotte, 1956- (author)
- Linköpings universitet,Hälsouniversitetet,Klinisk immunologi
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- Skogh, Thomas, 1952- (author)
- Östergötlands Läns Landsting,Linköpings universitet,Hälsouniversitetet,Reumatologi,Länskliniken för Reumatologi i Östergötland
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- Åberg, A K (author)
- Örebro
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- (creator_code:org_t)
- Elsevier BV, 2004
- 2004
- English.
- In: Journal of Autoimmunity. - : Elsevier BV. - 0896-8411 .- 1095-9157. ; 22:3, s. 241-248
- Journal article (peer-reviewed)
Abstract
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- Objectives. To evaluate and compare the performances of three enzyme-immunoassays (EIAs) and a double radial immunodiffusion (DRID) test in addition to immunofluorescence (IF) microscopy for routine laboratory screening of patient sera sent for antinuclear antibody (ANA) analysis. Methods. 3079 consecutive patient sera sent for routine testing of ANA were analysed by IF microscopy on HEp-2 cells (IF-ANA), three different ANA-EIAs, and a DRID test for antibodies against extractable nuclear antigens. The IF-ANA and DRID tests were regarded as reference methods. Results. By IF-ANA and/or DRID, 375 sera (12%) turned out ANA-positive. A further 171 sera (6%) were positive by EIA, but could not be confirmed either by IF microscopy or DRID. 32 of the 375 ANA-positive (9%) sera were negative by IF microscopy, but had precipitating antibodies against Ro/SS-A (52 and/or 60 kD). Conclusions. Different assays for ANA analysis give overlapping results to a certain extent, but are by no means interchangeable. Thus, different ANA tests reflect different aspects of these autoantibodies. The diagnostic utility of ANA testing still mainly refers to IF-microscopy and precipitin tests. IF-ANA should not be abandoned as the golden standard in clinical routine, until diagnostic and classification criteria for systemic lupus erythematosus and other systemic inflammatory autoimmune diseases have been revised. However, in addition we strongly advocate that a specific test for anti-Ro/SS-A antibodies is always included.
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