类风湿性关节炎（ＲＡ）是以侵犯关节及关节周围组织为主的一种慢性全身性自身免疫性疾病。目前病因尚不明，但一般认为与感染、遗传等因素有关。一些病例的临床表现不典型，给此病的早期诊断带来困难。为了解类风湿因子（ＲＦ）在ＲＡ患者血清中的分布与表现情况，笔者对 ４０ Rheumatoid arthritis (RA) is a chronic systemic autoimmune disease predominantly affecting the tissues surrounding joints and joints. The etiology is not yet clear, but it is generally believed that with the infection, genetic and other factors. The clinical manifestations of some cases are not typical, to the early diagnosis of the disease is difficult. In order to understand the distribution and performance of rheumatoid factor (RF) in the serum of RA patients,