Search results
15 maj 2024 · This thyroid test analyzer will help you understand your TSH, T3, T4, and other thyroid function test results. Select a test and enter your lab value to learn more.
5 wrz 2023 · Tests measuring free T4 – either a free T4 (FT4) or free T4 index (FTI) – more accurately reflect how the thyroid gland is functioning when checked with a TSH. The finding of an elevated TSH and low FT4 or FTI indicates primary hypothyroidism due to disease in the thyroid gland.
28 maj 2024 · Thyroid-stimulating hormone (TSH): High TSH levels are a sign of an underactive thyroid (hypothyroidism). They show that the pituitary gland is trying to stimulate the thyroid gland to produce thyroid hormones.
If the TSH level is low and the FT4 result is high this suggests an overactive thyroid (hyperthyroidism) that requires treatment. If the TSH level is slightly raised but the FT4 level is still within the normal reference range this is called subclinical hypothyroidism or mild thyroid failure.
1 maj 2023 · Thyroid function tests measure the levels of T3, T4, and TSH in the blood. They are critical not only for diagnosing thyroid problems but also in differentiating between a primary and a secondary cause of thyroid disease. A change in TSH that parallels T3 and T4 changes indicates a secondary problem originating in the anterior pituitary.
5 cze 2023 · The main hormones produced by the thyroid gland are thyroxine or tetraiodothyronine (T4) and triiodothyronine (T3). Thyrotropin-releasing hormone (TRH) from the hypothalamus, thyroid-stimulating hormone (TSH) from the anterior pituitary gland, and T4 work in synchronous harmony to maintain proper feedback mechanisms and homeostasis.
Once inside the thyroid follicular cells, T3 and T4 are cleaved from thyroglobulin. Free T3 and T4 are then released into the bloodstream, where they are bound to serum proteins for transport. The primary transport protein is thyroxine-binding globulin (TBG), which has high affinity but low capacity for T3 and T4.
