<prompt> A patient presents with cutaneous vasculitis, glomerulonephritis and peripheral neuropathy. What investigation is to be performed next for work up?ANCARA factorHBsAgCRP  <response>: C-ANCA Ag against which C ANCA is directed against is -Proteinase 3 P-ANCA - Ag against which P ANCA is directed against is -MPO 