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Free Triiodothyronine (T3) Analysis

Free Triiodothyronine (T3) Analysis is a blood test that measures the level of free T3, the active form of the hormone triiodothyronine, which circulates unbound in the bloodstream. T3 is one of the two major hormones produced by the thyroid gland, the other being thyroxine (T4). While T4 is produced in greater amounts, T3 is significantly more potent and plays a crucial role in regulating metabolism, heart rate, growth, and development.


Reference Range:

  • Normal Range: 2.0 to 4.4 picograms per milliliter (pg/mL).

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Free Triiodothyronine (T3) Analysis is essential for diagnosing and managing thyroid function, particularly useful in detecting hyperthyroidism and assessing the efficacy of treatments for thyroid disorders. Monitoring Free T3 levels guides treatment adjustments, involving medication modifications to balance hormone production and lifestyle interventions to support overall thyroid health, ensuring that therapy effectively manages the metabolic and symptomatic impacts of thyroid imbalances.

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