C9 and AA amyloidosis: Among complement and coagulation cascade proteins, complement C4‐A (median, 3.68 × 108; range, 1.35 × 108‐7.27 × 108 vs 1.65 × 108; 3.70 × 107‐4.18 × 108; P = .001), complement C9 (median, 1.14 × 108; range, 3.83 × 107‐2.69 × 108 vs 5.68 × 107; 8.25 × 106‐1.12 × 108; P = .005) and complement factor D (median, 8.59 × 108; range = 1.05 × 107‐3.4 × 109 vs 6.31 × 107; 1.26 × 106‐6.01 × 108; P = .008) were higher in cats with renal AA amyloidosis compared to cats without AA amyloidosis.