Thyroid gland plays an important role in regulating the body metabolism, heart rate, and thermoregulation. The thryoid gland produces two active hormones T4 & T3 under the influence of TSH secreted by the pituitary gland. The thyroid hormones are normally bound to the proteins in blood and can be affected by the levels of these proteins. The free hormone levels give a more accurate picture of these hormones. This panel helps evaluate the thyroid gland function and diagnose thyroid disorders. It provides information about the free hormone levels.