Objective: Hematological parameters including neutrophil–lymphocyte ratio (NLR), platelet–lymphocyte (PLR), and monocyte–lymphocyte (MLR) have been demonstrated as new predictors of prognosis activity in various diseases. In this study, we aimed to investigate the associations NLR, PLR MLR with disease severity patients anti-neutrophil cytoplasmic antibody (ANCA) associated vasculitis (AAV). &#...