Thyroid Gland Function and Anatomy

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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?

T3 Signup and view all the answers

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

Posterior Signup and view all the answers

What reference range is considered normal for Total T3 levels?

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

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

Hyperthyroidism Signup and view all the answers

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

Present in seafood and dairy products Signup and view all the answers

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

Biotin Signup and view all the answers

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

Thyroxine-binding globulin (TBG) Signup and view all the answers

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

In patients with abnormal thyroid binding proteins Signup and view all the answers

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

Thyroglobulin Signup and view all the answers

Which method can be used to measure thyroglobulin?

ELISA Signup and view all the answers

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

Thyroglobulin autoantibodies Signup and view all the answers

What is the most useful test in assessing thyroid function?

Third-generation TSH assay Signup and view all the answers

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

Third-generation TSH assay Signup and view all the answers

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

35% Signup and view all the answers

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

Specificity of the antibody used Signup and view all the answers

What is the principal secretory product of the thyroid gland?

Thyroxine (T4) Signup and view all the answers

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

Thyroxine (T4) Signup and view all the answers

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

Triiodothyronine (T3) Signup and view all the answers

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

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