[Fundamental examination and the reference values of anticardiolipin antibodies].

We studied sera from 146 healthy individuals in a fundamental examination to obtain reference values for anticardiolipin antibodies by the enzyme-linked immunosorbent assay (ELISA). The good results were obtained in the evaluation of concentrations of pretreatment substances, cardiolipin antigen and serum samples, as well as in reproducibility and stability on the storage of the samples. However, there was interference by triglycerides, hemoglobin and birilubin. The O.D. values and positive values of IgG, IgA and IgM in healthy individuals were 0.105, 0.111, 0.173 and 4.1%, 2.7%, 2.7% respectively. Furthermore, the incidences of anticardiolipin antibodies in systemic lupus erythematosus, mixed connective tissue disease, progressive systemic sclerosis, Sjogren's syndrome, polymyositis/dermatomyositis, rheumatoid arthritis, unclassified connective tissue disease, polyartertis nodosa and idiopathic thrombocytopenic purpura were 48.0%, 40.0%, 50.0%, 21.4%, 26.3%, 29.4%, 40.0% and 25.0% respectively. Especially, the incidence of IgG antibody against cardiolipin was high. Detection of phospholipid cardiolipin antibodies using ELISA was considered to be a useful for clinical diagnosis and monitoring of patients with systemic lupus erythematosus and associated autoimmune disorders.