Podcast
Questions and Answers
Which of the following is true regarding primary hypothyroidism?
Which of the following is true regarding primary hypothyroidism?
- Plasma free and total T4 and T3 levels are increased
- Thyroid stimulating antibody are directed against TSH receptor on thyroid cells
- TSH,T4, and T3 are all decreased
- Plasma [TSH] increases (correct)
What is a characteristic feature of secondary or tertiary hypothyroidism?
What is a characteristic feature of secondary or tertiary hypothyroidism?
- Thyroid stimulating antibody are directed against TSH receptor on thyroid cells
- Plasma free and total T4 and T3 levels are increased
- TSH,T4, and T3 are all decreased (correct)
- Plasma [TSH] increases
Which statement is true about medications that interfere with thyroid function testing?
Which statement is true about medications that interfere with thyroid function testing?
- Biotin can interfere with measurement of thyroid hormones in the lab (correct)
- Estrogens cause a decrease in the level of binding proteins
- Biotin should be taken for 2 days before blood is drawn for testing
- Estrogens result in normal levels of total T4 and T3
What is the purpose of determining the presence of autoimmune thyroid diseases such as Graves’ disease or Hashimoto’s thyroiditis?
What is the purpose of determining the presence of autoimmune thyroid diseases such as Graves’ disease or Hashimoto’s thyroiditis?
What is a characteristic feature of primary hyperthyroidism?
What is a characteristic feature of primary hyperthyroidism?
Which test is often considered the diagnostic 'gold standard' for thyroid disease?
Which test is often considered the diagnostic 'gold standard' for thyroid disease?
What is the effect of increased TBG level on the concentrations of total T4 and T3?
What is the effect of increased TBG level on the concentrations of total T4 and T3?
Which test provides a more reliable diagnosis of thyroid dysfunction than measurement of total T4 and T3?
Which test provides a more reliable diagnosis of thyroid dysfunction than measurement of total T4 and T3?
In primary hyperthyroidism, what are the levels of T4, T3, and TSH due to feedback inhibition?
In primary hyperthyroidism, what are the levels of T4, T3, and TSH due to feedback inhibition?
What is the effect of a normal TSH level on some patients with ongoing symptoms?
What is the effect of a normal TSH level on some patients with ongoing symptoms?
In primary hypothyroidism, both T4 and T3 levels are decreased, and TSH levels are increased.
In primary hypothyroidism, both T4 and T3 levels are decreased, and TSH levels are increased.
Elevated thyroid antibodies always indicate the presence of autoimmune thyroid diseases such as Graves’ disease or Hashimoto’s thyroiditis, despite a 'normal' TSH level.
Elevated thyroid antibodies always indicate the presence of autoimmune thyroid diseases such as Graves’ disease or Hashimoto’s thyroiditis, despite a 'normal' TSH level.
Secondary hypothyroidism is characterized by decreased levels of TSH, T4, and T3.
Secondary hypothyroidism is characterized by decreased levels of TSH, T4, and T3.
Primary hyperthyroidism is characterized by decreased plasma TSH levels due to feedback inhibition on the pituitary.
Primary hyperthyroidism is characterized by decreased plasma TSH levels due to feedback inhibition on the pituitary.
Estrogens, such as those found in birth control pills, can cause high levels of total T4 and T3 due to their effect on binding proteins.
Estrogens, such as those found in birth control pills, can cause high levels of total T4 and T3 due to their effect on binding proteins.
TSH level in the blood is not a reliable test for thyroid status for all patients with ongoing symptoms.
TSH level in the blood is not a reliable test for thyroid status for all patients with ongoing symptoms.
Total T4 and total T3 are more reliable for diagnosing thyroid dysfunction than free T3 and T4.
Total T4 and total T3 are more reliable for diagnosing thyroid dysfunction than free T3 and T4.
Changes in TBG level do not affect the concentrations of total T4 and total T3 in plasma.
Changes in TBG level do not affect the concentrations of total T4 and total T3 in plasma.
Thyroid antibody tests are used to determine the presence of autoimmune thyroid diseases such as Graves’ disease or Hashimoto’s thyroiditis.
Thyroid antibody tests are used to determine the presence of autoimmune thyroid diseases such as Graves’ disease or Hashimoto’s thyroiditis.
In primary hyperthyroidism, both T4 and T3 levels are decreased, and TSH level is increased due to feedback inhibition.
In primary hyperthyroidism, both T4 and T3 levels are decreased, and TSH level is increased due to feedback inhibition.
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