Rheumatoid generally refers to rheumatoid arthritis. The normal value of blood sedimentation is usually considered to be 0-15mm/h for men and 0-20mm/h for women, although there are corresponding changes in the range of blood sedimentation depending on age, generally in the range of 0-20mm/h for men and 0-30mm/h for women who are older than 50 years old. However, rheumatoid arthritis also requires a comprehensive diagnosis based on the number of joints involved, the degree of joint changes, the duration of the disease, and laboratory test data such as rheumatoid factors to confirm the diagnosis. Rheumatoid arthritis is a chronic, systemic autoimmune disease with predominantly joint lesions, which can manifest as pain, swelling, impaired mobility or even deformity of small joints. Increased fibrinogen and macroglobulin levels in the blood of patients with rheumatoid arthritis may accelerate the sedimentation rate, resulting in higher sedimentation values than in the normal population. However, elevated sedimentation is only one of the reference indicators for rheumatoid arthritis and cannot be used as the only criterion. In addition to the sedimentation, the diagnosis of rheumatoid arthritis also needs to be combined with joint activity performance and physical signs: e.g., usually morning stiffness lasting more than 1 hour, disease duration lasting more than 6 weeks; persistent swelling of 3 or more joints for more than 6 weeks; persistent symmetrical joint swelling and other joint manifestations; positive rheumatoid factor (RF), etc.