Thyroxine Binding Globulin (TBG) Blood Test

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Feature	Labcorp	Quest Diagnostics
Price	$24.49	$21.99
Results in	~3 business days	~5 business days
Sample type	Blood Serum	Blood Serum
Require fasting	No	No

About the test

Thyroxine-Binding Globulin (TBG) is a protein that binds and transports thyroid hormones (T3 and T4) in the bloodstream. Measuring TBG helps evaluate thyroid function and can aid in distinguishing between different causes of abnormal thyroid hormone levels.

Included biomarkers & Reference ranges

Biomarker	Reference range
Thyroxine Binding Globulin (TBG) The main protein that transports thyroid hormone in your blood. Helps interpret total T4/T3 results, since binding protein levels affect them.	M 12.7–25.1 µg/mL F 13.5–30.9 µg/mL

Reference ranges vary by lab, age, and sex (M/F). Your report shows your exact range. Click any biomarker to see its optimal range and what your results mean.

How it works

1. Order online No referral or insurance
2. Get a requisition By email in 24–72 hours
3. Visit a draw center Bring a matching photo ID
4. Get results Securely by email

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Consultations

Not sure how to read your results? We can help.

Schedule a consultation with a Hormunity specialist. We’ll walk through every marker, interpret what it means for you, and map out the next steps for your care.

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