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Thyroxine-binding Globulin (TBG), serum

Thyroxine-binding Globulin (TBG), serum

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:

  • Monitor or diagnose thyroid disorders
  • Monitor thyroid replacement therapy
  • Help evaluate function of the pituitary gland

Fasting is not required for this test. Take all medications as prescribed.