TSH is also known as thyroid stimulating hormone, and the normal range is 0.27-4.2. Currently, most hospitals in China use this reference range, which may vary slightly from hospital to hospital. If thyroid stimulating hormone levels are below the lower limit of the test value, less than 0.27, this indicates a possible combination of hyperthyroidism. If the thyroid stimulating hormone level is higher than the upper limit of normal, greater than 4.2, it indicates possible hypothyroidism, and the patient needs further improvement of thyroid antibodies or thyroid ultrasound.