A novel strategy with combined assays for detection of anti-neutrophil cytoplasmic antibody (ANCA) in clinically ANCA-negative granulomatosis with polyangiitis patients

Granulomatosis with polyangiitis (GPA) that is localized to the upper airway presents a diagnostic challenge because of a tendency towards anti-neutrophil cytoplasmic antibody (ANCA)-negativity. The purpose of this study was to investigate whether positivity of ANCA detection might be elicited with combined use of enzyme-linked immunosorbent assay (ELISA) kits. (Source: Auris, Nasus, Larynx)

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