The rheumatoid factor is now medically ready to be changed because it is too intuitive and easily misunderstood by the general public. The high rheumatoid factor is rheumatoid when you go to the hospital, but it is not. The reason is that a high rheumatoid factor does not mean that it is rheumatoid, and a low rheumatoid factor does not mean that it is not rheumatoid, but it is not very specific and cannot be used as a specific serum indicator. So low rheumatoid factor should be seen in conjunction with symptoms, if there are no symptoms, rheumatoid can be ruled out; if low, but the symptoms are obvious, such as small joint pain, it is likely to be rheumatoid, we should not believe too much in rheumatoid factor, which has some reference value in medicine, but is not absolute.