Thyroxine-binding Globulin (TBG), serum Blood Test

Item # LC001735

Thyroxine-binding Globulin (TBG), serum Blood Test  - Life Extension

Thyroxine-binding Globulin (TBG), serum Blood Test

Item # LC001735

If you’ve been undergoing thyroid hormone therapy or are investigating a thyroid disorder, this test will assess your levels of thyroxine-binding globulin, which carries thyroid hormones T3 and T4 in the blood. This test also may be useful in assessing pituitary function.

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.

The laboratory services are for informational purposes only. It is not the intention of National Diagnostics, Inc and Life Extension to provide specific medical advice but rather to provide users with information to better understand their health. Specific medical advice including diagnosis and treatment will not be provided. Always seek the advice of a trained health professional for medical advice, diagnosis or treatment.

Both the physician and the testing laboratory are independent contractors with whom National Diagnostics, Inc makes arrangements for your blood tests. Neither National Diagnostics, Inc or Life Extension will be liable for any acts or omissions of the physician, the testing laboratory, or their agents or employees.

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Thyroxine-binding Globulin (TBG), serum Blood Test


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