[Paradigm shift in ANCA diagnostics : New international consensus recommendations].

Area of Science:

• Immunology
• Clinical Diagnostics
• Rheumatology

Background:

• Traditional antineutrophil cytoplasmic antibodies (ANCA) detection involves indirect immunofluorescence (IIF) followed by antigen-specific assays.
• Advancements in sensitive and specific PR3-ANCA and MPO-ANCA immunoassays question the necessity of the two-stage diagnostic approach for ANCA-associated vasculitis (AAV).

Purpose of the Study:

• To present and discuss new international consensus recommendations for ANCA testing in AAV.
• To provide updated guidelines for ANCA detection in clinical practice.

Main Methods:

• Development of new ANCA testing guidelines based on a large multicenter study by the European Vasculitis Society (EUVAS).
• The guidelines were drafted by a committee, revised by contributors, and reviewed by 12 international experts before ratification.

Main Results:

• Results confirm the superior diagnostic value of antigen-specific immunoassays over IIF for ANCA detection.
• The study validates the effectiveness of PR3-ANCA and MPO-ANCA immunoassays.

Conclusions:

• Current consensus recommendations favor the primary use of PR3-ANCA and MPO-ANCA immunoassays for diagnosing AAV.
• The findings suggest that additional IIF testing may not be categorically required for AAV diagnosis.