Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test
Thyroxine-Binding Globulin (TBG) Blood Test

Over 250k Biomarkers Tested

Thyroxine-Binding Globulin (TBG) Blood Test

$54.00 AUD

Getting thyroid test results that do not match how you feel, or wondering whether hormone transport proteins could be affecting your readings?

Measures thyroxine-binding globulin (TBG), the main protein that transports thyroid hormones in the bloodstream. Changes in TBG levels can make standard thyroid results appear misleading, so this test helps clarify whether abnormal hormone readings reflect true thyroid dysfunction or altered transport.

Collection Location
Specimen Type

You will be emailed a referral to take to your local collection centre. If you ever have any questions, we're here to help.

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How It Works

Getting your health measured shouldn't be hard! We're here to help you every step of the way.

1
Order a test

Order a test

Order the private test that suits you and your goals. After ordering, you will receive your referral by email.

2
Collect the sample

Collect the sample

Attend one of our 4000+ partner collection centres throughout Australia. Search locations.

3
Receive your results

Receive your results

View all your lab results in your secure health dashboard. Easy!

Overview

TBG (thyroxine-binding globulin) is the main transport protein for thyroid hormones T4 and T3 in your bloodstream. It carries about 75% of circulating thyroid hormones.

When TBG levels are abnormal, total thyroid hormone measurements can be misleading. High TBG means more hormone is bound up in transport, so total T4 may appear elevated even though the amount of active (free) hormone is normal. Low TBG has the opposite effect.

Pregnancy, liver disease, kidney problems, oestrogen therapy, and certain genetic variations can all affect TBG levels.

Symptoms

Useful when standard thyroid function tests do not match symptoms. Relevant for people with liver or kidney disease, those taking medications that affect protein levels, and for interpreting thyroid tests during pregnancy.

Questions

  • TBG significantly influences total thyroid hormone measurements. Understanding TBG levels helps prevent misinterpretation of thyroid tests.
  • Common causes include pregnancy, oestrogen therapy, oral contraceptives, liver disease, and genetic variations.
  • TBG deficiency itself does not typically cause symptoms because free thyroid hormone levels stay normal.
  • Pregnancy typically doubles TBG levels due to increased oestrogen.
  • Medication dosing should be guided by free hormone levels and symptoms rather than total levels.
  • Yes. TBG deficiency can be inherited and is more common in males due to X-linked inheritance.

Dr. Vu Tran
Bloody Good’s Chief Medical Officer

Biomarker Tested

How to prepare

No fasting required. Morning collection is recommended. Avoid biotin supplements for 3 days before testing. Let your healthcare provider know about pregnancy, liver or kidney conditions, and medications.

After the test

Discuss results with your healthcare provider to understand how your TBG levels affect interpretation of other thyroid tests. If TBG is abnormal, your provider may rely on free hormone levels rather than total levels.

Your test results will be available in your private dashboard. If there are any urgent issues, we'll let you know so you can follow up with your health professional.

Understanding results

Normal range is typically 12 to 28 mg/L. High TBG may be caused by pregnancy, oestrogen therapy, liver disease, or genetic factors. Low TBG may be linked to liver disease, kidney disease, malnutrition, or certain medications.

Testimonials

What Our Customers Say

4.9
Average Rating
5,500+ Customers Tested
250,000+ Individual Biomarkers
A
Adam O. ACT

Simple health checks in my control

I didn't know that private blood tests were an option. Tried this platform as the packages suited what I wanted for a good price. Easy to follow instructions, and super quick results. Platform provides more information than my gp's ever have on the tests and what the results meant. Would like more clinics to be able to test at (specifically Capital Pathology) but there is a decent network. Will continue to use.

The Performance Check
W
Wayne S. NSW

Bloody Good

This is a great service, very helpful support, cheaper than going to the doctor for a blood test

Vitamin D (25-OH)
C
Christopher N. NSW

Quick access to blood tests

BLOODY GOOD is a very efficient route to access blood testing for a visitor outside the Australian health system. It is quick with the necessary referral and documentation, and quick with results. Thank you

Full Blood Count (FBC) Blood Test
R
Rebecca Y NSW

Great Service!

Fantastic service to deal with, I love the extra explanations for all the tests.

Glycated Haemoglobin (HbA1c)
O
Olga B. New South Wales

Convenient

Getting a referral was easy. Laverty pathology accepted it. Bloody Good offers an affordable and convenient way to check essential blood markers.

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Marita S. Queensland

Bloody good test

Very comprehensive tests that have given me a good picture of my overall health.

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Lukas C. NSW

Quick, easy, hassle free

Excellent service, quick, easy, hassle free, can recommend.

Testosterone Free/Total + SHBG
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ABDUL S. QLD

Amazingly quick and efficient

Very easy to use. Love that it stores your blood tests.

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Andre D. QLD

5 Stars

Efficient and easy to use

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Wayne NSW

5 Stars

Extremely helpful company

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"I'm a little biased as I work here! However, I love that The Bloody Good Test tracks my health over time. After turning 40, I wanted to make sure I wasn't going to drop dead from something basic I should have known about earlier. Measuring all my core biomarkers each year gives me peace of mind my health is on the right track"
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Frequently bought together

Frequently Asked Questions

Most collection centres accept walk-ins. Some may require a booking - check details when you click on your chosen location.

If your test needs fasting, we’ll include that in your instructions after you order. Fasting usually means no food for 8–12 hours, but water is fine.

Just your pathology referral form (we email it to you)

Of course. Just maybe don’t bring the friend who faints at the sight of blood.

They’re the highly trained professionals who take your blood sample - with a steady hand and a sharp needle. They love blood, but don’t worry… they’re not vampires. Just legends who make blood tests quick, clean, and (almost) painless.

Some of our tests include Urine, Stool, Saliva and more. Each test will have a clear description on what sample you will need to give and instructions on how.