These tests are key in diagnosing and managing thyroid diseases, such as hypothyroidism and hyperthyroidism. Here’s what each part of this combination represents:
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TSH (Thyroid Stimulating Hormone): TSH is a hormone produced by the pituitary gland that regulates the production of thyroid hormones. A high TSH level usually indicates an under-active thyroid (hypothyroidism), while a low TSH level suggests an overactive thyroid (hyperthyroidism).
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T4F (Free T4 or Free Thyroxine): Free T4 measures the level of thyroxine that is not bound to proteins in the blood and is therefore available to enter and affect the body's cells. This test helps in understanding how much active thyroid hormone is available to the body.
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T3Free (Free T3 or Free Triiodothyronine): Free T3 measures the amount of triiodothyronine that is unbound and active. Although T4 is the primary hormone produced by the thyroid gland, it is converted into the more potent T3 in various tissues in the body. Free T3 levels provide additional information about thyroid function, especially in the diagnosis and management of hyperthyroidism.
Together, these tests provide a comprehensive picture of thyroid health by assessing both the regulatory hormone (TSH) and the active thyroid hormones (Free T4 and Free T3). This helps healthcare providers determine if the thyroid is functioning properly or if adjustments to thyroid medication are necessary