CRP and rheumatoid arthritis: WBC count (median [IQR]: 7.36 [5.74–10.06] vs. 6.84 [5.43–8.51], p = .035], TG levels (median [IQR]: 1.11 [0.91–1.41] vs. 0.97 [0.74–1.32], p = .003), ESR (median [IQR]: 55 [26.5–76.5] vs. 42 [22.5–63.0], p = .019), CRP (median [IQR]: 36.9 (15.35–76.8] vs. 23.3 [19.22–62.40], p = .016), UA levels (median [IQR]: 358 [269.5–441.5] vs. 270 [214–324.5], p < .001), Scr (median [IQR]: 88 [77.5–103] vs. 59 [50–68], p < .001), and CysC (median [IQR]: 1.50 [1.33–1.75] vs. 0.97 [0.85–1.11], p < .001) significantly increased compared with that of RA participants with normal renal function.