The diagnosis of hyperthyroidism is made on the basis of the patient’s clinical manifestations and the results of various medical examinations, while other diseases (e.g., other metabolic disorders that resemble some of the symptoms of hyperthyroidism) are also excluded. In addition, the doctor should not only determine whether the patient is suffering from hyperthyroidism, but also analyze the type and severity of hyperthyroidism and formulate a treatment plan according to the condition, for which some selective or comprehensive examinations must be carried out. There are many tests for hyperthyroidism in hospitals, and different tests reflect the condition of the thyroid gland and the whole body from different aspects. Usually the doctor will decide whether all the tests are needed or selective tests are needed according to the specific conditions of each patient. 1.General indicators. It mainly includes blood routine, electrolytes, liver and kidney functions, etc. to help determine the general condition of the body. 2.Serum thyroid hormone level check. Including serum total T3 (TT3), total T4 (TT4), free T3 (FT3), free T4 (FT4) and other measurements, in which at least one of these indicators is in an increased state in hyperthyroidism. In patients with severe hyperthyroidism, these markers may be very high. 3, thyrotropin (TSH). TSH is secreted by the human pituitary gland, and its physiologic role is to promote the growth of the thyroid gland and secretion of thyroid hormones. In hyperthyroidism, the secretion of TSH is inhibited, so the test value is very low. After hyperthyroidism is controlled, TSH gradually returns to normal, but the recovery is slower than that of thyroid hormones. In hypothyroidism, TSH is overproduced. 4. Serum thyroid antibody test. Including thyrotropin receptor antibody (TRAb), thyroid peroxidase antibody (TPOAb), thyroglobulin antibody measurement (TGAb). These tests can identify which type of hyperthyroidism a patient has and can help determine future changes in thyroid function in hyperthyroid patients. 5. Thyroid iodine uptake (131I) rate measurement. This test also helps to identify the type of hyperthyroidism in the patient and is helpful in the iodine-131 treatment program. 6. Thyroid ultrasonography and thyroid nuclear imaging. These two tests can analyze the size of the thyroid gland, blood flow abnormalities, and the changes and nature of the nodules in the thyroid gland in patients with hyperthyroidism. The results of these tests are helpful in treatment decision making and allow objective comparison of thyroid changes before and after treatment. 7. Other tests such as X-CT, fine needle aspiration cytology of the thyroid. In some cases, the doctor may require these tests, probably because of the complexity of hyperthyroidism, especially when it is necessary to exclude some malignant lesions. 8, hyperthyroidism combined with complications or other diseases to do other related tests.