The Thyroglobulin Antibody (TgAb) test measures antibodies that target thyroglobulin, a protein produced by the thyroid gland and essential for thyroid hormone production. When the immune system mistakenly attacks this protein, it can interfere with normal thyroid function and signal an underlying autoimmune thyroid disorder. Elevated thyroglobulin antibodies are most commonly associated with autoimmune thyroid conditions such as Hashimoto’s thyroiditis and Graves’ disease. These disorders can cause a wide range of symptoms—including fatigue, weight changes, hair thinning, neck swelling, and heart rate changes—that often develop gradually and may be overlooked without testing. This test also plays an important role in thyroid cancer monitoring. In individuals treated for differentiated thyroid cancer, thyroglobulin is used as a tumor marker. The presence of TgAb can interfere with thyroglobulin measurements, making antibody testing essential for accurate follow-up and detection of recurrence. In addition, thyroid autoimmunity can impact fertility and pregnancy outcomes. Identifying thyroglobulin antibodies helps uncover immune-related thyroid dysfunction early, allowing for targeted treatment and better long-term thyroid health management. What Is Included In This Test? This test measures the level of thyroglobulin antibodies (TgAb) in your blood. Your results can help: Detect autoimmune thyroid disease Support diagnosis of Hashimoto’s thyroiditis or Graves’ disease Clarify abnormal thyroid hormone test results Improve accuracy of thyroid cancer monitoring Evaluate immune-related fertility or pregnancy concerns TgAb testing is often interpreted alongside other thyroid function and antibody tests for a complete assessment. Who Should Consider This Test? This test is ideal for individuals with symptoms, conditions, or risk factors related to thyroid autoimmunity. You should consider this test if you: Have unexplained fatigue, weight changes, or hair thinning Experience neck swelling or thyroid enlargement Have abnormal TSH or thyroid hormone levels Have a family history of autoimmune thyroid disease Are being monitored after thyroid cancer treatment Are experiencing infertility or pregnancy complications linked to thyroid health Early detection supports accurate diagnosis and more effective thyroid management. Convenient, No-Appointment Testing To complete your test: Order online through our website Use the lab locator to find a nearby testing location Walk in; no appointment required Access your results securely in your HealthLabs.com account within one to three business days 110% Price Guarantee! If you find the same test for a lower price from a comparable provider, contact us. We not only match the price, we beat it by an additional 10 percent of the difference.