How is Hashimoto’s disease diagnosed?

First, your healthcare provider will take your medical history and perform a physical exam. He or she will feel your thyroid gland to determine if it is enlarged. Blood tests are also ordered. These include:

  • Thyroid stimulating hormone (TSH) test. A high TSH level means the thyroid gland is not producing enough T4 hormone. This is a sign of hypothyroidism.
  • T4 test. A low T4 level suggests that the person has hypothyroidism.
  • Antithyroid antibody test. The presence of antibodies means that the person’s immune system is attacking the thyroid.

Imaging tests that may be ordered include ultrasound and a CT scan. The ultrasound shows the size of the thyroid and reveals the presence of any nodules or growths. The CT scan shows additional details about the size of the goiter and the health of the surrounding tissue.

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