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FT3 (Free Triiodothyronine)

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FT3 (Free Triiodothyronine)

Accredited Facility E-report Qualified Specialists

This test is done to measure the level of free T3, the active form of thyroid hormone that affects metabolism, heart rate, and energy use in the body. It helps evaluate thyroid gland function and is useful in diagnosing and monitoring thyroid disorders such as hyperthyroidism or hypothyroidism, especially when other thyroid tests are abnormal.

  • If there are symptoms of hyperthyroidism such as weight loss, rapid heartbeat, or anxiety.
  • If hypothyroidism is suspected with fatigue or weight gain.
  • If TSH or FT4 results are abnormal.
  • If a healthcare provider is monitoring thyroid disease treatment.
  • No fasting is required.
  • No special preparation is usually needed.
  • Inform your healthcare provider about thyroid medications or supplements.
  • Follow any instructions provided by the laboratory or healthcare provider.
    • FT3 (Free Triiodothyronine)
    No labs currently offering this test.