Rheumatoid factor 11.3IU/ml is within the normal reference value range. Rheumatoid factor normal reference value range is 0~20IU/ml, 11.3IU/ml is within the normal reference value range, elevated rheumatoid factor is mainly seen in systemic lupus erythematosus, rheumatoid arthritis and other autoimmune diseases, as well as hepatitis, tuberculosis and other diseases, but the rheumatoid factor is in the normal range can’t be absolutely ruled out these diseases. Not every case of rheumatoid arthritis and other autoimmune diseases will have a positive rheumatoid factor test, the value of the positive can not confirm the diagnosis of these diseases, rheumatoid factor can only provide diagnostic clues for the diagnosis of these autoimmune diseases, the final diagnosis needs to be combined with the patient’s medical history, signs and symptoms, as well as the results of other ancillary tests for analysis. Laboratory test results should be interpreted by a professional physician, and it is recommended that patients go to the rheumatology and immunology departments of regular hospitals for consultation.