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Thyroxine-binding globulin (TBG) is one of three proteins responsible for carrying the thyroid hormones thyroxine (T4) and triiodothyronine (T3) in the bloodstream. These hormones can be found in two forms: free or attached to a protein. The greatest percentage of thyroid hormones are attached to TBG.
This test can be used to:
Fasting is not required for this test. Take all medications as prescribed.
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