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Laboratory diagnostics in vasculitis patients Wiik AIsr Med Assoc J 2001[Apr]; 3 (4): 275-7Anti-neutrophil cytoplasm antibodies are important markers of certain small vessel necrotizing vasculitides, but the optimal use of laboratory results in daily clinical practice necessitates collaboration between clinicians and laboratory specialists. Physicians must familiarize themselves with ANCA tests in ANCA-related vasculitides as well as in differential diagnostic patient populations in order to define cutoff values. Indirect immunofluorescence with a consensus-agreed technique combined with standardized enzyme immunoassays is the modality for detecting the main SSV-associated ANCA specificities using cutoff values that can sufficiently distinguish SVV from non-SVV patients. The combined use of IIF and direct EIA to demonstrate proteinase 3-ANCA and myeloperoxidase-ANCA at significant levels leads to a very high diagnostic specificity towards SVV conditions such as Wegener's granulomatosis, microscopic polyangiitis, Churg-Strauss syndrome, and limited forms of these such as renal-limited focal necrotizing glomerulonephritis. A strong reactivity of ANCA against several azurophil granule components indicates a drug-induced syndrome. ANCA-related SVV and drug-induced vasculitis or lupus syndromes have characteristic ANCA profiles that can help distinguish these conditions from other inflammatory diseases.|*Antibodies, Antineutrophil Cytoplasmic[MESH]|*Clinical Laboratory Techniques[MESH]|Diagnosis, Differential[MESH]|Fluorescent Antibody Technique, Indirect[MESH]|Humans[MESH]|Immunoenzyme Techniques[MESH]|Multicenter Studies as Topic[MESH]|Vasculitis/*diagnosis[MESH] |
