Igg subclasses of antineutrophil cytoplasm autoantibodies (anca)
Sera that had been positive in routine ELISA for ANCA were studied retrospectively for the IgG subclass distribution of these autoantibodies. An ELISA previously developed for measurement of IgG sub classes of anti-GBM antibodies was modified for this purpose. Of a total of 247 sera, 114 were found to be positive in at least one of the assays for IgG subclasses of anti proteinase 3, 72 of these pa