Test library
Thyroglobulin Antibody Test
The thyroglobulin antibody test measures autoantibodies directed against thyroglobulin, a protein made by the thyroid gland. It is used to help evaluate autoimmune thyroid conditions such as Hashimoto thyroiditis and Graves disease.
Order Thyroglobulin Antibody
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Thyroglobulin Antibody- Typical turnaround
- 1-3 business days
- Starting price
- From $138
- Results
- Confidential, online
Quick answer
The thyroglobulin antibody test measures autoantibodies that target thyroglobulin, a protein the thyroid gland uses to make thyroid hormones. The presence of these antibodies suggests an autoimmune process affecting the thyroid. The test is usually ordered with other thyroid tests and interpreted by a qualified healthcare provider.
What this test measures
Thyroglobulin is a protein stored in the thyroid gland and used as a building block for thyroid hormones. In some autoimmune conditions, the immune system mistakenly produces antibodies against this protein. Measuring these antibodies can support the evaluation of conditions such as Hashimoto thyroiditis and Graves disease, which involve immune activity against the thyroid.
The test requires a blood sample, drawn from a vein. The laboratory measures thyroglobulin antibodies using an immunoassay and reports a level with a reference range. Because these antibodies can be present alongside other thyroid antibodies, the result is often reviewed together with TSH, free T4, and thyroid peroxidase antibodies.
A positive result supports the possibility of an autoimmune thyroid condition but does not confirm one by itself. Some healthy people have low levels of these antibodies, and results must be combined with hormone levels and clinical findings. A qualified healthcare provider makes the diagnosis and decides on any follow-up.
- Thyroglobulin antibodies (TgAb)
- Thyroid peroxidase antibodies (TPOAb) when paired
- Thyroid-stimulating hormone (TSH)
- Free thyroxine (free T4)
- Free triiodothyronine (free T3)
- Thyroglobulin level (when ordered separately)
- Antibody titer level
Why people order this test
- Support evaluation of autoimmune thyroid disease
- Follow up on an abnormal thyroid hormone result
- Investigate goiter or thyroid swelling with a provider
- Check for autoimmune thyroid activity before or after treatment
- Complete a thyroid antibody panel
How to prepare
No fasting is usually needed for this blood test. A sample is collected from a vein, usually at the arm. Follow any timing instructions provided by the laboratory, especially if other thyroid tests are included.
Understanding your results
Results are typically available within one to three business days. The report shows the thyroglobulin antibody level and its reference range. A positive result suggests autoimmune thyroid activity, and a qualified healthcare provider interprets it with other thyroid tests and clinical findings.
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Frequently Asked Questions
What is thyroglobulin?
It is a protein made and stored in the thyroid gland. The body uses it to produce thyroid hormones that regulate metabolism.
What do thyroglobulin antibodies mean?
They are autoantibodies that target thyroglobulin. Their presence suggests the immune system is reacting against the thyroid gland.
Does a positive result mean I have a thyroid disease?
Not on its own. The result supports evaluation of an autoimmune thyroid condition, but diagnosis also depends on hormone levels and clinical findings.
Why are other thyroid tests ordered too?
Thyroglobulin antibodies are usually reviewed with TSH, free T4, and thyroid peroxidase antibodies to build a complete picture of thyroid function.
Do I need to fast?
Fasting is not usually required for this test unless it is combined with other panels that call for it.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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