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.