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.

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.

TT4 is the main product of thyroid secretion and is an essential ingredient in the integrity of the hypothalamic-pituitary gland. The TT4 measures can be used for the diagnosis of hyperthyroidism, primary and secondary, and TT4 inhibition of treatment.

Thyroxine (T4) is the main thyroid hormone secreted into the bloodstream by the thyroid gland. Together with triiodothyronine (T3) it plays a vital role in regulating the body's metabolic rate, influences the cardiovascular system, growth and bone metabolism, and is important for normal development of gonadal functions and nervous system.

Thyroxine (T4) is the main thyroid hormone secreted into the bloodstream by the thyroid gland. Together with triiodothyronine (T3) it plays a vital role in regulating the body's metabolic rate, influences the cardiovascular system, growth and bone metabolism, and is important for normal development of gonadal functions and nervous system.