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Table 1 International Society of Nephrology/Renal Pathology Society classification of lupus nephritis

From: Lupus nephritis: current update

Class I Minimal mesangial lupus nephritis
Class II Mesangial proliferative lupus nephritis
Class III Focal lupus nephritis (<50% glomeruli)
   III(A) Active lesions
   III(A/C) Active and chronic lesions
   III(C) Chronic lesions
Class IV Diffuse lupus nephritis (>50% glomeruli)
  Diffuse segmental (IV-S) or global (IV-G)
   IV(A) Active lesions
   IV(A/C) Active and chronic lesions
   IV(C) Chronic lesions
Class V Membranous lupus nephritis
Class VI Advanced sclerosing lupus nephritis
(≥90% globally sclerosed glomeruli without residual activity)
  1. Adapted with premission from Weening et al. [9].