类风湿性关节炎(RA)是常见的以关节滑膜慢性炎症病变为主要表现的慢性自身免疫性疾病,发病两年内即可出现不可逆性骨关节破坏。早期诊断并给予治疗能及时控制病情、减少骨关节破坏并改善预后。故早期诊断治疗是降低RA致残的重要途径。目前类风湿因子(RF)是最常用的检测项目,特异 Rheumatoid arthritis (RA) is a common chronic autoimmune disease mainly characterized by chronic synovial inflammation of the joint, which can cause irreversible destruction of bone and joint within two years after onset. Early diagnosis and treatment can be timely control of the disease, reduce bone and joint destruction and improve prognosis. Therefore, early diagnosis and treatment is an important way to reduce the disability of RA. Rheumatoid factor (RF) is the most commonly used test items, specific