A material which is used to establish known points of reference for a number of assays intended to be used for the qualitative and/or quantitative screening for one or multiple antibodies associated with vasculitis in a clinical specimen. These antibodies may include autoimmune antibodies directed at the glomerular basement membrane (GBM), anti-neutrophil cytoplamic antibodies to myeloperoxidase (ANCA MPO) and/or anti-neutrophil cytoplamic antibodies to proteinase-3 (PR3).