What is the normal value of rheumatoid factor?

The normal value of rheumatoid factor is generally 0 - 20 IU/ml. At present, there are many methods commonly used to detect rheumatoid factor in clinical practice. The lower limit and upper limit of detection of different methods may be different, which makes the specific normal range may vary slightly. Even within the normal range, the rheumatoid factor levels of different individuals may not be exactly the same. Some people may be born with relatively low or high levels, but this does not necessarily mean that there is a health problem. When the test value is higher than the normal upper limit, it cannot be directly diagnosed as a disease such as rheumatoid arthritis. Other autoimmune diseases, infections, certain chronic diseases and even normal people in special circumstances Rheumatoid factor may also be elevated (e.g. elderly). The possibility of related diseases cannot be completely ruled out within the normal range. For patients with typical symptoms such as joint pain, swelling, stiffness, etc., even if rheumatoid factor is normal, it is still necessary to make a comprehensive judgment in combination with other examinations and clinical manifestations. For some autoimmune disease patients or people at high risk, regular monitoring of rheumatoid factor levels can help evaluate disease progression and treatment effectiveness. Normal values of rheumatoid factor are only a reference range, and clinical diagnosis and evaluation need to be analyzed comprehensively. When interpreting the test results, it should be combined with the specific symptoms, signs and other examination results of the patient, and accurate judgment and diagnosis should be made by professional doctors.