Thyroglobulin Antibody
Thyroglobulin Antibody can be requested without a referral, and this overview covers what to expect. A thyroglobulin antibody test checks for antibodies that target thyroglobulin, a protein made by the thyroid gland. It is ordered to help evaluate autoimmune thyroid conditions and to interpret thyroglobulin levels in people treated for thyroid cancer.
- Sample type
- blood
- Category
- Thyroid
- Turnaround
- 1-3 business days
- Price
- $138
- Referral
- Not required
A thyroglobulin antibody test checks for antibodies that target thyroglobulin, a protein made by the thyroid gland. It is ordered to help evaluate autoimmune thyroid conditions and to interpret thyroglobulin levels in people treated for thyroid cancer.
What it measures
- Thyroglobulin Antibodies — The amount of these autoantibodies in the blood.
- Thyroglobulin — Often measured alongside; antibodies can interfere with this test.
- Thyroid-Stimulating Hormone (TSH) — A hormone that reflects thyroid function.
- Free Thyroxine (Free T4) — A thyroid hormone that helps assess gland activity.
Who it is for
A healthcare provider may order this test if you have symptoms of a thyroid disorder, abnormal thyroid test results, or are being monitored for thyroid cancer.
Preparation
No fasting or special preparation is usually required. Tell your provider about any medications or supplements you take, as some can affect results.
Results and what they mean
Results are reported as a number with a reference range; a positive result means antibodies were detected. Your clinician interprets the result along with your symptoms, other thyroid tests, and medical history. This is general information, not medical advice.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the thyroglobulin antibody is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Do I need to fast for this test?
No, fasting is not typically needed.
What does a positive result mean?
It means thyroglobulin antibodies were found, which can happen in autoimmune thyroid conditions. Your clinician will explain what it means for you.
Can this test diagnose thyroid cancer?
No, it is not used alone to diagnose cancer. It helps monitor people already treated for thyroid cancer.
How long do results take?
Results are usually available within 1–3 business days.