Thyroid hormone level testing is primarily indicated for hyperthyroidism, hypothyroidism, and thyroid disorders such as Hashimoto’s thyroiditis.
There are many thyroid-related hormones. The five that are closely related to thyroid function are: triiodothyronine (TT3), thyroxine (TT4) , supersensitivity thyroid stimulating hormone (TSH), free T3 (FT3), and free T4 (FT4). However, there may be a little difference depending on the hospital. Five of them, TT3, TT4, TSH, FT3 and FT4, are important for assessing thyroid function. They can be used to screen for thyroid-like disorders or to guide their treatment, such as hyperthyroidism, hypothyroidism, Hashimoto’s thyroiditis, and post-thyroidectomy. However, due to regional and hospital differences, the items included in the five thyroid function tests may vary, but the purpose of the tests is the same.