The Anti Thyroglobulin Antibody test is done to measure the antibodies known as thyroglobulin, a protein that is found in the thyroid cells in the thyroid gland. The thyroid gland is a small butterfly shaped gland situated in the lower front of the neck and is responsible for making T3 and T4 hormones. These two hormones help in controlling your metabolism that is used in providing energy to your body. This test helps in diagnosing thyroid issues, including Hashimoto's thyroiditis and autoimmune thyroid disease.