There are two types of thyroid tests: T3, T4, and TSH, and free T3, free T4, and TSH. The purpose of the thyroid triple test is to determine whether there are any abnormalities in thyroid function, such as the presence of hyperthyroidism or subclinical hyperthyroidism, hypothyroidism or subclinical hypothyroidism, or other abnormalities of the thyroid gland. If there is abnormal thyroid function, either hyperthyroidism or hypothyroidism will need to be treated. If you have subclinical hyperthyroidism, you may not need treatment for the time being, and regular review is sufficient. In the case of subclinical hypothyroidism, thyroid stimulating hormone greater than 10 or the presence of hyperlipidemia also require treatment. For women of childbearing age who are planning to get pregnant or are already pregnant, thyroid stimulating hormone should be controlled within 4.0 mIU/L, preferably within 2.5 mIU/L in the early stage of pregnancy and within 3.0 mIU/L in the middle and late stage of pregnancy.