<prompt> Answer this question truthfullyWhat criteria are used to diagnose Hashimotos thyroiditis?  <response>: <reason> There are no established criteria for the diagnosis of Hashimotos thyroiditis. The diagnosis of Hashimotos thyroiditis is made based on laboratory, ultrasound, and pathological findings after the clinical suspicion: Laboratory findings Presence of TPO antibodies Low T3 and T4 High TSH Ultrasound findings Reduced echogenicity Pathological findings Germinal centers Lymphocytic infiltrationThe following flowchart describes the clinical approach to the diagnosis of Hashimotos thyroiditis.Neck pain Yes No RAIU Presenting symptoms and TFTs Increased Decreased Hyperthyroid Hypothyroid Euthyroid RAIU Suppurative thyroiditis De Quervains thyroiditis Increased Decreased Hashimotos thyroiditis Riedels thyroiditis Graves disease Silent thyroiditis Postpartum thyroiditisTFT; Thyroid function testsTSH, T4, and T3, Graves disease is not a thyroiditis, RAIU; Radioiodine uptake.One third of Riedels thyroiditis presents with hypothyroidism. Table modified from 