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How to order a Thyroid test online.
A Thyroid test includes T3, T4, and TSH in the body. T3 and T4 circulate in the blood bound and linked to molecules of protein. The bodys true thyroid levels are defined by the free T4 and free T3. Thyroid levels of hormones that are free react with cell receptors.
Thyroid levels are low in hypothroidism. Excess TSH is released by the pituitary gland and thyroid levels of TSH rise. A Thyroid test is performed when blood TSH thyroid levels are low, often kept down to levlels below 0.01 mIU per L, hyperthyroidism occurs. Patients with abnormal thyroid levels or thyroid function may have normal TSH levels in beginning stages of dysfunctional thyroid. For this reason, a FT4 and FT3 determination must be ran.
T4 is primarily produced in the gland of the thyroid with only small amounts of T3. In the liver, the majority of T3 present in the blood is made by conversion of T4 to T3.
