Thyroid Gland Function and Anatomy
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Questions and Answers

What is the primary source of the hormone Triiodothyronine (T3)?

  • It is released by the pituitary gland
  • It is derived from the deiodination of T4
  • It is synthesized in the adrenal glands
  • It is produced by the thyroid gland (correct)
  • Which gland is responsible for the production of thyroid hormone and calcitonin?

  • Pancreas
  • Thyroid gland (correct)
  • Thymus gland
  • Pituitary gland
  • What is the main role of thyroid hormones in the body?

  • Controlling heart rate
  • Regulating blood glucose levels
  • Aiding digestion
  • Regulating body metabolism (correct)
  • Which thyroid hormone is more biologically active?

    <p>T3</p> Signup and view all the answers

    Where is the parathyroid gland positioned in relation to the thyroid gland?

    <p>Posterior</p> Signup and view all the answers

    What reference range is considered normal for Total T3 levels?

    <p>80-200ng/dL</p> Signup and view all the answers

    What does an increased Free Thyroxine (FT4) value suggest?

    <p>Hyperthyroidism</p> Signup and view all the answers

    What is the key determinant in thyroid function related to iodine?

    <p>Present in seafood and dairy products</p> Signup and view all the answers

    Which substance may interfere with Free Thyroxine (FT4) measurements?

    <p>Biotin</p> Signup and view all the answers

    Which type of proteins are responsible for binding the majority of thyroid hormones in the body?

    <p>Thyroxine-binding globulin (TBG)</p> Signup and view all the answers

    When might a Free Triiodothyronine (FT3) test be less commonly performed?

    <p>In patients with abnormal thyroid binding proteins</p> Signup and view all the answers

    What is the ideal tumor marker and post-treatment thyroid cancer surveillance test?

    <p>Thyroglobulin</p> Signup and view all the answers

    Which method can be used to measure thyroglobulin?

    <p>ELISA</p> Signup and view all the answers

    What antibodies are most commonly associated with Hashimoto’s thyroiditis?

    <p>Thyroglobulin autoantibodies</p> Signup and view all the answers

    What is the most useful test in assessing thyroid function?

    <p>Third-generation TSH assay</p> Signup and view all the answers

    Which generation of TSH assay is preferred for monitoring and adjusting thyroid hormone replacement therapy?

    <p>Third-generation TSH assay</p> Signup and view all the answers

    In patients with hypothyroidism due to autoimmune disease, what percentage have anti-Tg autoantibodies?

    <p>35%</p> Signup and view all the answers

    What is the primary factor influencing the accuracy of the thyroglobulin assay?

    <p>Specificity of the antibody used</p> Signup and view all the answers

    What is the principal secretory product of the thyroid gland?

    <p>Thyroxine (T4)</p> Signup and view all the answers

    Which hormone's plasma concentration is a good indicator of the thyroid secretory rate?

    <p>Thyroxine (T4)</p> Signup and view all the answers

    To what is Thyroxine (T4) converted in peripheral tissue?

    <p>Triiodothyronine (T3)</p> Signup and view all the answers

    What range is considered a normal reference range for Thyroxine (T4) in plasma concentration?

    <p>0.4-4.0 mIU/L</p> Signup and view all the answers

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