Frequently asked question: What is TBG?

TBG is thyroxine-binding globulin. TBG is a protein that binds to the thyroid hormone so that the hormone is not flowing around in its free form in the bloodstream. This test is mainly done on newborns with abnormal heel prick results (with a T4 level that is too low). Purpose: to test the amount of protein present that can bind to thyroid hormone.

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