Normal results of an antithyroglobulin antibody test results are negative; there should not be antibodies present in the bloodstream, according to Healthline. Small amounts may indicate thyroid cancer, type 1 diabetes, pernicious anemia, rheumatoid arthritis or another autoimmune disease.
The antibodies are formed when the body's immune system mistakenly attacks thyroglobulin, a protein produced by the thyroid gland that helps produce hormones, states Healthline. Doctors test for the antibodies when patients exhibit signs of a malfunctioning thyroid, including fatigue, weight gain, constipation and dry skin. Patients with enlarged thyroid glands and autoimmune conditions -such as Graves' disease and Hashimoto thyroiditis- may also have the test administered.