- Triiodothyronine Free (FT3) Test: The FT3 test measures the level of free triiodothyronine (T3) in the blood, which is the unbound and biologically active form of the thyroid hormone. T3 plays a vital role in regulating metabolism, energy production, and overall growth and development in the body.
- Purpose: This test is primarily used to assess thyroid function and diagnose thyroid disorders such as hyperthyroidism and hypothyroidism. It can help evaluate patients with symptoms of thyroid dysfunction, such as weight changes, fatigue, and mood fluctuations.
- Test Methodology: A blood sample is collected and analyzed using sensitive immunoassay techniques that specifically measure the concentration of free T3, excluding the protein-bound forms.
- Normal Range: Normal FT3 levels typically range from 2.3 to 4.2 pg/mL, though reference ranges may vary slightly depending on the laboratory and patient demographics.
- Interpretation:
- Low FT3 Levels: Indicate hypothyroidism, suggesting insufficient production of thyroid hormones, which can lead to decreased metabolic activity and associated symptoms.
- High FT3 Levels: Suggest hyperthyroidism, indicating excessive production of thyroid hormones, which may lead to increased metabolic activity and symptoms such as weight loss, anxiety, and heat intolerance.
- Clinical Relevance: The FT3 test is essential for a comprehensive evaluation of thyroid health. It provides critical information about the active form of thyroid hormone in circulation and aids in the diagnosis and management of thyroid disorders, guiding treatment options such as hormone replacement therapy or further diagnostic testing.
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