Many patients are confused about how to check for rheumatoid arthritis. In fact, rheumatoid arthritis can be examined in two ways: self-examination and consultation. The following is the method of these two aspects of examination, to introduce to you. Self-examination: 1. Morning stiffness greater than 30 minutes, or even more than an hour; 2. Swelling of the wrist, metacarpal and proximal fingertip joints for more than six weeks; 3. Symmetrical joint swelling. That is, the onset of the same joints on both sides of the body; 2. Consultation: 1. Hematocrit most patients have an increased rate of hematocrit, especially in the acute phase. 2. Hemoglobin level is slightly lower than normal, and in advanced cases, mild anemia may occur, with hemoglobin level mostly between 8-10g. 3.Anti-streptococcal hemolysin O, rheumatoid factor Typical rheumatoid patients can have positive anti-streptococcal hemolysin O test, and rheumatoid factor is mostly positive. 4, immunoglobulin test about 70% of rheumatoid patients can appear IgM abnormal, IgG is mostly positive. 5.Arthrofluid examination in damaged joints is mostly cloudy, but there are no bacteria, and the viscosity of the joint fluid is lower than normal. Microscopic examination shows no crystalline material in the joint fluid. (1) Soft tissue swelling: shows an increase in the shadow of the joint capsule. (2) Narrowing of joint space: due to cartilage involvement and defects. (3) Peri-articular osteoporosis: shows reduced, atrophied and thinning bone trabeculae in the peri-articular bone. 7.Other imaging techniques CT and MRI can be used as appropriate, especially for early cases.