TG and Hashimoto thyroiditis: High titers of anti-thyroid peroxidase (anti-TPO) or anti-thyroglobulin (anti-Tg)antibodies in serum confirm the diagnosis; Serum titers of thyroid stimulatinghormone (TSH) and free T4 (FT4) hormone measurements and imaging studies, such asthe ultrasound (US), are used to diagnose Hashimoto's thyroiditis.