CRP and systemic lupus erythematosus: Erythrocyte sedimentation rate (ESR), complement 3 (C3), complement 4 (C4), C-reactive protein (CRP), autoantibody status, and use of hydroxychloroquine, glucocorticoids, immunosuppressants, or NSAIDs did not significantly differ between P-SLE and NP-SLE patients.