TT3 is the main hormone that thyroid hormone does to various target organs. The serum TT3 concentration reflects the thyroid gland’s ability to function better than the thyroid gland. TT3 is an important indicator of early hyperthyroidism and the monitoring of recurrent hyperthyroidism and pseudo thyrotoxicosis.
Thyroid stimulating hormone(TSH) is a hormone secreted by adenohypophysis to promote the growth and function of the thyroid gland. The changes of TSH is noted prior to the T4 and T3 for months or years, as is of great value for the diagnosis of thyroid dysfunction and lesions.
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