Diagnosis of Hashimoto’s thyroiditis is primarily based on signs and symptoms as well as the results of blood tests which include these 2 tests:
- A hormone test. Blood tests can determine the amount of hormones produced by thyroid gland and pituitary gland. If thyroid is underactive, the levels of thyroid hormones are low. At the same time, the level of thyroid-stimulating hormone (TSH) is elevated since the pituitary gland tries to stimulate thyroid gland to produce more thyroid hormone. Early stage of Hashimoto’s thyroiditis, TSH level might be raised and a thyroxine hormone (T4) or free T4 and a triiodothyronine hormone (T3) subsequently decrease.
- An antibody test. Due to Hashimoto’s thyroiditis is an autoimmune disorder, the cause involves the production of certain antibodies. A blood test may confirm the presence of anti-thyroglobulin antibodies (anti-Tg) or/and antibodies against thyroid peroxidase (TPO antibodies), an enzyme normally found in the thyroid gland that plays an important role in the production of thyroid hormones.
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