Rheumatoid factor 35IU/ml is a positive result, suggesting that the patient may have rheumatoid arthritis, scleroderma, systemic lupus erythematosus and other diseases, whether it is serious or not according to the patient’s specific type of disease, condition, personal constitution and other factors there is a big difference, can not be generalized. The normal reference value of rheumatoid factor ranges from 0 to 20IU/ml, while rheumatoid factor 35IU/ml is a positive result, in addition to rheumatoid arthritis and other autoimmune diseases and chronic active hepatitis there is a certain link, but also can be seen in the elderly, so according to the patient’s specific type of disease, condition and other factors to determine whether the rheumatoid factor 35IU/ml is serious. Rheumatoid arthritis or systemic lupus erythematosus patients who are older, have poor general health or chronic diseases are in relatively serious condition, and elevated rheumatoid factor can also be seen in some elderly people, which is generally not serious. Laboratory test reports need to be interpreted by a professional physician, it is recommended that patients with rheumatoid factor of 35IU/ml go to the Department of Rheumatology and Immunology of a regular hospital for detailed consultation.