Hyperthyroidism, or hyperthyroidism for short, is a thyrotoxicosis caused by excessive production of thyroid hormones by the thyroid glands themselves. Commonly used clinical tests for hyperthyroidism include: 1. Thyroid stimulating hormone (TSH): Changes in serum thyroid stimulating hormone concentration are the most sensitive indicator of thyroid function. In hyperthyroidism, thyrotropin is usually$€˂0.01mU/L. 2. Total serum thyroxine (TT₄): This indicator is stable and reproducible, and is one of the main indicators for the diagnosis of hyperthyroidism. 3.Serum free thyroxine (FT₄): free triiodothyronine (FT₃): despite their low levels, they are closely related to the biological effects of thyroid hormones, so they are the main indicators for diagnosing clinical hyperthyroidism. 4. Serum total triiodothyronine (TT₃): In most cases of hyperthyroidism, serum TT₃ is elevated along with TT₄. In T₃ thyrotoxicosis, only TT₃ is elevated. 5. 131I uptake rate: In hyperthyroidism, the 131I uptake rate shows an increase in total uptake and a shift in the peak uptake. 6, TSH receptor antibody (TRAb): It is one of the important indicators to identify the cause of hyperthyroidism and diagnose diffuse toxic goiter. 7, Anti-thyroglobulin antibody (TGAb) and anti-thyroid peroxidase antibody (TPOAb): are often elevated in hyperthyroidism. 8.Electron computerized tomography (CT) and thyroid ultrasonography. 9. Thyroid radionuclide scan: It is meaningful for diagnosing autonomous high-functioning adenoma of the thyroid gland. Therefore, there are more tests for hyperthyroidism, and the choice is mainly based on the patient’s symptoms and signs and what tests have been done and other specific circumstances.