CRP and systemic lupus erythematosus: Clinical indexes, including 24 h UP (2340.9 ± 3217.4 mg vs. 752.1 ± 863.6 mg; p < 0.001), BUN (7.8 ± 5.4 mmol/L vs. 5.0 ± 2.0 mmol/L; p < 0.001), Cr (76.1 ± 69.7 μmol/L vs. 55.0 ± 34.7 μmol/L; p < 0.01), uric acid (331.6 ± 143.5 μmol/L vs. 295.1 ± 109.0 μmol/L; p < 0.05), CRP (21.5 ± 38.9 mg/L vs. 11.9 ± 23.2 mg/L; p < 0.05), ESR (55.1 ± 33.1 mm/h vs. 32.8 ± 27.6 mm/h; p < 0.001), and SLEDAI (8.5 ± 4.6 vs. 4.0 ± 3.6; p < 0.01) displayed an obvious increase in SLE patients with NTIS compared to the euthyroid group.