Thyroglobulin Blood Test

Name: Thyroglobulin Blood Test
Brand: Bloody Good
Price: 46.0 AUD
Availability: InStock

$46.00 AUD

Under specialist care after thyroid cancer treatment or a thyroidectomy, and need to keep tabs on your thyroglobulin levels as part of ongoing monitoring?

Measures thyroglobulin, a protein produced exclusively by thyroid tissue. Used primarily to monitor for residual or recurrent thyroid cancer after thyroidectomy or radioiodine treatment, where levels are expected to be very low or undetectable.

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.

Order a test

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

Collect the sample

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

Receive your results

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

Overview

Thyroglobulin is a protein produced exclusively by thyroid tissue. In a person with an intact thyroid gland, thyroglobulin is present in the blood at measurable levels as part of normal thyroid function. After a total thyroidectomy (complete surgical removal of the thyroid) or radioiodine ablation treatment for thyroid cancer, thyroglobulin levels are expected to fall to very low or undetectable levels, because the tissue that produces it has been removed or destroyed.

This is what makes thyroglobulin useful as a monitoring marker. In people who have been treated for differentiated thyroid cancer (papillary or follicular types), a rising thyroglobulin level after treatment can indicate that thyroid tissue remains or that the cancer has recurred. Conversely, a persistently undetectable level is generally reassuring. Thyroglobulin surveillance is a standard part of post-treatment follow-up and is typically managed by an endocrinologist or oncologist.

There is an important limitation to this test. Thyroglobulin antibodies (TgAb) are present in a proportion of thyroid cancer patients and can interfere with the thyroglobulin measurement, producing falsely low results. When TgAb is present, the thyroglobulin reading may be unreliable, and your specialist will usually order both tests together. A trend in TgAb levels over time can provide additional information in these cases.

This is not a general thyroid health test and is not used for screening. It is specifically suited to people under specialist care following thyroid cancer treatment or thyroidectomy, where ongoing thyroglobulin monitoring is part of the surveillance plan. Results should always be interpreted by the endocrinologist or oncologist managing your care.

Symptoms

This test is used to track thyroglobulin levels over time in people who have had their thyroid removed or treated for thyroid cancer. Because only thyroid cells produce this protein, detectable or rising levels after treatment can indicate remaining or recurrent thyroid tissue. It is used under specialist guidance as part of ongoing surveillance.

Questions

This test is primarily used by people who have had their thyroid removed or treated for thyroid cancer, and are under ongoing specialist surveillance. It is not a general thyroid health marker.
Thyroglobulin antibodies (TgAb) can interfere with the measurement and cause a falsely low reading. Your specialist will usually check for antibodies at the same time.
No. Thyroglobulin is used as a monitoring marker after treatment, not as a standalone diagnostic tool. Any concerns about thyroid cancer require specialist investigation.
Yes. This test is processed through accredited pathology labs, the same as those used by specialist clinics.
It is often useful to test TgAb alongside thyroglobulin, as antibodies can interfere with the result. Discuss this with your managing specialist.

Dr. Vu Tran
Bloody Good’s Chief Medical Officer

How to prepare

No fasting required. Eat and drink normally before your blood draw. If you have thyroglobulin antibodies (TgAb), let your practitioner know before testing — they can interfere with thyroglobulin measurement and affect the reliability of results.

After the test

This test is most meaningful when interpreted by the endocrinologist or oncologist managing your thyroid cancer care. Bring your results to your next specialist appointment. If you haven't tested TgAb recently, ask whether it should be included.

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

- After a total thyroidectomy and radioiodine ablation, thyroglobulin should be undetectable.
- Low but detectable levels may indicate residual thyroid tissue.
- Rising levels over time can prompt further investigation by your specialist.
- TgAb interference: If thyroglobulin antibodies are present, results may be unreliable. Your specialist may order both tests together.

Testimonials

What Our Customers Say

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Frequently Asked Questions

Do I need to book ahead?

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

How do I know if I need to fast?

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.

What do I need to bring?

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

Can I bring someone with me?

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

What’s a phlebotomist?

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.

What other samples may I need to provide for my test?

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.