Thus, these data may be added to others that were previously characterized for evaluating the activity of rheumatoid arthritis, such as the serum protein profile and the C-reactive protein (Rothkopf-Ischebeck 1980; Sharp et al. 1982) and should also allow extrapolations for the serum of patients with greater or lesser severity of rheumatoid arthritis. Here, CRP is linked to rheumatoid arthritis.