Table 2.

C4d staining patterns in different renal anatomic compartments.

	Glomeruli	Arteriole	PTC	TBM
Negative	6 (1.8%)	223 (68.6%)	215 (66.2%)	183 (56.3%)
Minimal	37 (11.4%)	78 (24%)	90 (27.7%)	116 (35.7%)
Focal	88 (27.1%)	15 (4.6%)	13 (4.0%)	21 (6.5%)
Diffuse	194 (59.7%)	9 (2.8%)	7 (2.2%)	5 (1.5%)

PTC, peritubular capillary; TBM, tubular basement membrane; Minimal, Focal and Diffuse represent the distribution of the C4d staining <10%, 10-50% and >50% respectively for Arteriole, PTC and TBM. Minimal, Focal and Diffuse represent the semi-quantitative grade (1-3) of the glomerular C4d staining for Glomeruli.