Thyroxine Binding Globulin (TBG)

What this laboratory test evaluates

DetailsThyroxine-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.

What type of sample is required for this test?Serum

Test ResourcesFor more information, please consult your healthcare provider.

Additional test information

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.

Collection and processing

• Sample type: Serum
• Fasting: No
• Estimated laboratory processing: Results should arrive 1 – 3 business days after the lab receives samples.

How Sunridge uses laboratory information

Sunridge considers the medical question, symptoms, history, medications, prior results, and whether the finding could change care before recommending testing. A laboratory result is not interpreted in isolation and does not establish a diagnosis by itself.

Before requesting this test

Availability, collection requirements, eligibility, and processing estimates can change. Sunridge reviews each request and, when appropriate, creates the order through Fullscript. Follow the current instructions supplied with the approved order.