Thyroxine-Binding Globulin (TBG) Serum Test

Thyroxine-Binding Globulin (TBG) Serum Test

Quick Overview

Measures the level of TBG, a protein that moves thyroid hormone throughout your body.

Test #001735


Availability: In stock

Also Known As Serum thyroxine binding globulin; Serum TBG level
Short Description

Measures the level of TBG, a protein that moves thyroid hormone throughout your body.

Test Type Blood
Test Results 3-5 days. May take longer based on weather, holiday or lab delays.
Retail Price $119.00
Meta Keywords No
Meta Description A Thyroxine-Binding Globulin Blood Test measures the levels of TBG in the blood, helping to determine the cause of high or low levels of thyroid hormone.

The Thyroxine-Binding Globulin (TBG) blood test measure the patient's TBG levels. Found in the blood, TBG is a protein necessary for transporting the thyroid hormone.

Alterations of TBG can typically be resolved by the thyroid profile test, but occasionally TBG must be directly measured. Testing Thyroxine-binding Globulin helps distinguish between high T4 levels due to hyperthyroidism, or due to increased binding by TBG in euthyroid (having normal thyroid gland function) individuals with normal levels of free hormones. Additionally, a TBG blood test helps document cases of hereditary deficiency or increase of TBG and work-up of thyroid disease.

Measurements of TBG are only occasionally needed in patients with low T4, high T3 or the reverse, who clinically seem eumetabolic and have normal FTI (Free Thyroxine Index or T7). These patients may have hereditary anomalies of TBG.

TBG levels increase due to pregnancy, estrogens, tamoxifen, perphenazine and in some cases of liver disease, including hepatitis. Decreased TBG is found in some instances of nephrosis, chronic liver disease and systemic disease, and with large amounts of glucocorticoids, acromegaly and androgens/anabolic steroids.

Trusted, Secure, & Confidential

Please wait...