A patient seated in the chair before a blood draw
In person

Thyroglobulin Antibody

Antibodies against a thyroid protein, measured from one blood draw.

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  • 2,000+ lab locations. Find one near you
  • Nothing due at the lab. FSA / HSA accepted
  • Ordered by a licensed clinician

At a glance

Collection
Blood draw
A standard blood draw at the lab.
Preparation
None
Nothing to do ahead of time. Water is fine.
Results
1 to 3 days
Typical turnaround after your visit.
Where
2,000+ lab locations
Nationwide, with nothing due at the lab.

About this test

Thyroglobulin is a protein the thyroid uses to make its hormones. This test measures antibodies against it, which relate to autoimmune thyroid conditions. It is usually read with TPO antibodies and TSH, and a positive result on its own is not a diagnosis. No fasting is needed.

For adults 18 and older. Test availability varies by lab location.

Who should take this test?

This test is for adults with a family history of thyroid conditions, a borderline TSH, or a past antibody result, who want to add a second thyroid antibody to TPO.

Ask about this test

Not sure this is the right test?

AI-generated. For information only, not medical advice. Call 911 for an emergency.

What does this test measure?

Your result shows whether antibodies to thyroglobulin are above the lab’s reference range, which a healthcare provider reads with TPO antibodies and your thyroid hormone levels.

Thyroglobulin antibodies
Thyroglobulin is a protein the thyroid uses to store and make hormone. Antibodies against it can appear in autoimmune thyroid conditions, sometimes when TPO antibodies do not. Like TPO antibodies, a positive result is not a diagnosis on its own and is read with your other thyroid results.
Why it’s measured: A second thyroid antibody that can appear in autoimmune conditions.

How it works

  1. Step 1

    Order online

    Check out here. A licensed clinician in your state reviews your order and sends it to the lab.

  2. Step 2

    Visit a lab

    Bring a photo ID to any of 2,000+ lab locations. No fasting needed, and nothing is due at the lab.

  3. Step 3

    Get your results

    Results post to your account, usually in 1 to 3 days, each number next to the lab’s reference range.

Find a lab near you

Choose from 2,000+ lab locations nationwide. Your order works at any of them.

What your results tell you

Thyroglobulin antibodies are reported in international units per milliliter (IU/mL) and compared with the lab’s reference range.

  • Your number next to the lab’s reference range
  • Explained in plain language
  • A licensed clinician reviews your order and, if appropriate, orders the test.
  • A lab report you can download and share

A healthcare provider reads a raised result with your TSH, thyroid hormone, and TPO results before drawing any conclusion.

TPO or thyroglobulin antibodies?

Two thyroid antibodies that are often read together.

Thyroglobulin antibody

Antibodies to thyroglobulin, a protein used to make thyroid hormone.

Targets
Thyroglobulin, a protein made by the thyroid
Related to
Autoimmune thyroid conditions
Read with
TPO antibodies, TSH, and thyroid hormone levels

Clinical-grade testing, from the comfort of home.

From the lab to your report, every step of our process meets the gold standard in medical testing.

  • CLIA-certified labs

    Every lab we partner with is certified under the Clinical Laboratory Improvement Amendments, meeting both state and federal standards with regular independent inspections.

  • We protect your health data

    We protect your health data with encryption and do not sell it. Some results must be reported to public health authorities by law. See our Privacy Notice.

  • Rigorous quality assurance

    All partner labs run regular internal quality checks, participate in proficiency testing, and comply with federal and state lab regulations.

  • Clinician-reviewed reports

    Results are reviewed by an independent, licensed clinician.

Questions

Common questions.

Anything else, our care team answers by phone, text, or email.

Thyroglobulin is a protein made by the thyroid and used to build thyroid hormone. In autoimmune thyroid conditions, the immune system can make antibodies against it.

Along with other tests, these antibodies can help in evaluating conditions such as Hashimoto’s thyroiditis and Graves’ disease.

Not on its own. A positive result means the antibodies are above the lab’s reference range. It doesn’t by itself show whether your thyroid is working as it should. A healthcare provider reads it with TSH, thyroid hormone levels, TPO antibodies, and your symptoms.

They target two different thyroid proteins, and some people have one without the other. Checking both can give a healthcare provider more context when autoimmune thyroid questions come up, such as with a family history or a borderline TSH.

Lab tests are informational and don’t diagnose conditions on their own. Available to adults 18 and older; test availability varies by lab location. A licensed clinician reviews your order and, if appropriate, orders the test. All testing is performed at CLIA-certified laboratories. Not for emergencies: if you think you may be having a medical emergency, call 911.