Antineutrophil Cytoplasmic Antibody (ANCA) Profile

For diagnosis and monitoring inflammatory activity in primary systemic small vessel vasculitides. The anti-PR3-ANCA Immunoassay is useful for confirming positive ANCA results by IFA, particularly with the cANCA pattern. Presence of anti-PR3 antibodies is highly specific for Wegener granulomatous (WG) disease, for which the sensitivity is reported to be 98%. Levels of anti-PR3 are elevated during active phases of disease and lower during remission. Monitoring anti-PR3 levels, therefore, can aid in disease management. The anti-MPO-ANCA Immunoassay is useful for confirming positive ANCA results by IFA, particularly with the P-ANCA pattern. Presence of anti-MPO antibodies is highly specific for idiopathic and vasculitis-associated crescentic glomerulonephritis, classic polyarteritis nodosa, Churg-Strauss syndrome, and polyangiitis overlap syndrome without renal involvement. Levels of anti-MPO are elevated during active phases of disease and lower during remission. Therefore, monitoring anti-MPO levels can aid in disease management.