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Bookmark or Share- Thyroid Function Tests | American Thyroid AssociationT4 TESTS. T4 is the main form of thyroid hormone circulating in the blood. A Total T4 measures the bound and free hormone and can change when binding proteins differ (see above). A Free T4 measures what is not bound and able to enter and affect the body tissues.
- Thyroid Hormone: What It Is & Function - Cleveland ClinicThyroid hormone is the hormone that controls your body’s metabolism, the process in which your body transforms the food you eat into energy. The two main hormones your thyroid releases — thyroxine (T4) and triiodothyronine (T3) — collectively make up thyroid hormone.
- Total Thyroxine (T4) Test: Uses, Side Effects, Results - Verywell HealthA total thyroxine (T4) test helps your healthcare provider determine whether you have a thyroid disorder, such as an overactive or underactive thyroid. Learn more.
- T4 levels: What is a normal T4 level, and how it is tested?T4 is a type of thyroid hormone that regulates metabolism. T4 plays an important role in digestion, muscle function, and bone health. In this article, we outline the normal T4 levels in...
- T4 (Thyroxine) Test: What It Is, Function, Purpose & LevelsA T4 (thyroxine) test is a blood test that helps diagnose thyroid conditions. Too much or too little T4 can indicate an issue with your thyroid.
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