This test is a key part of our comprehensive autoimmune thyroid panel. It detects antibodies against thyroglobulin, a protein your thyroid uses to make hormones. Its presence, often along with Anti-TPO, is a strong indicator of Hashimoto's disease or Graves' disease. This test is essential for confirming that your thyroid symptoms have an autoimmune cause. For a complete picture, this test is vital. It helps your doctor confirm the root cause of your thyroid condition, not just the symptoms.