Glomerulonephritis - Differential Diagnosis Framework ANCA: • C-ANCA: GPA (Wegener's) • P-ANCA: Microscopic Polyangiitis, Eosinophilic GPA (Churg Strauss) Anti-GBM Immune Complex Mediated: • ↓C3: Infection-Related, Membranoproliferative • ↓C4: Lupus, Cryoglobulinemia • Normal C3/C4 (IgA): IgA Nephropathy, Henoch Schonlein Purpura SCVMC Internal Medicine @SCVMCMed #Glomerulonephritis #differential #diagnosis #nephrology #causes