Frequently asked question: How is Hashimoto's thyroiditis diagnosed?

Blood tests are run to determine if your thyroid gland is working too slowly. Tests are then done to see how much free T4 and TSH are present in your blood. In the case of Hashimoto's thyroiditis, the problem lies in the thyroid gland itself, and the free T4 is too low while the TSH is too high. You blood is also tested for antibodies against thyroid peroxidase (anti-TPO antibodies). These antibodies are found in the blood of most children (more than 90%), but we also see them in children who do not have thyroid problems or in children suffering from Graves' disease.

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