The four tests for rheumatoid arthritis usually include ESR, C-reactive protein (CRP), rheumatoid factor (RF) and anti-cyclic citrullinated peptide antibody (CCP), in addition to other laboratory tests and imaging tests to assist in the diagnosis. 1. Hematological sedimentation rate (ESR): patients can determine whether the disease is active or not based on ESR. 2. C-reactive protein (CRP) test: CRP is usually elevated during the active phase of the disease and returns to normal as the disease subsides. 3. Rheumatoid factor and anti-cyclic citrullinated peptide antibody: Rheumatoid factor has a high positivity rate in rheumatoid arthritis patients but low specificity, while anti-cyclic citrullinated peptide antibody has high sensitivity and specificity, which is an important indicator for confirming the presence of rheumatoid arthritis. 4. Other laboratory tests: anti-perinuclear factor (APF), anti-keratin antibody (AKA), anti-polyfilament protein antibody (AFA), anti-Sa antibody are highly specific in RA. They can appear in the early stage of the disease and are related to the severity of the disease and bone destruction, and can be used as an important indicator for early diagnosis and prognosis of RA. 5. Imaging examination: joint destruction can be seen in joint X-ray, CT or MRI can be used for lesions that are difficult to be shown in plain film. It is recommended that if you feel unwell and other abnormalities, you should go to the hospital in a timely manner and complete the relevant examinations under the guidance of the doctor to avoid delaying your condition.