Fasting is usually not required for hypothyroidism screening. At present, clinical tests for hypothyroidism are usually performed through laboratory tests such as thyroid function tests and thyroid ultrasound to determine the patient’s thyroid function. The five indicators examined in the five tests are free triiodothyronine (FT3), free thyroxine (FT4), thyrotropin (TSH), total thyroxine (TT4), and total triiodothyronine (TT3), of which TSH is the most sensitive indicator in the diagnosis of hypothyroidism. TSH is the most sensitive indicator for diagnosing hypothyroidism. The five items of thyroid function are not affected by food intake, so fasting is usually not required for hypothyroidism screening. However, if you need to check blood sugar, blood lipid, liver function, etc., fasting is required. After the diagnosis of hypothyroidism is confirmed, you should go to regular hospitals for regular checkups of thyroid function 5 and thyroid ultrasound, etc., so that the doctor can adjust the treatment plan at any time.