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1. What is the primary biological function of Free Thyroxine (FT4) in the human body?

A. To store iodine in the thyroid gland for future hormone synthesis.

B. To lower blood calcium levels by acting on bone tissue.

C. To stimulate the adrenal glands to produce cortisol.

D. To regulate the body's metabolic rate, oxygen consumption, and heat production.

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2. Which of the following best represents a typical reference range for serum Free Thyroxine (FT4) in adults?

A. 30 to 100 ng/mL

B. 0.9 to 1.7 ng/dL

C. 0.4 to 4.0 mIU/L

D. 5.0 to 12.0 mcg/dL

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3. Which of the following clinical conditions or situations is most likely to cause a temporary elevation in Free Thyroxine (FT4) levels?

A. Early phase of subacute thyroiditis

B. Severe iodine deficiency

C. A pituitary tumor secreting excess TSH

D. Overt hypothyroidism

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4. Which of the following physiological responses is primarily mediated by Free Triiodothyronine (FT3) at the cellular level?

A. Promotion of glycogenesis in the liver

B. Stimulation of the sympathetic nervous system and increased basal metabolic rate

C. Inhibition of protein synthesis in skeletal muscle

D. Decreased heart rate and cardiac output

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5. Which laboratory profile is most consistent with over hyperthyroidism?

A. Low TSH and low FT4

B. High TSH and high FT4

C. High TSH and low FT4

D. Low TSH and high FT4

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6. In a healthy adult, what is the primary source of circulating Triiodothyronine (T3)?

A. Direct secretion by the anterior pituitary gland

B. Peripheral conversion of Thyroxine (T4) by deiodinases in tissues

C. Direct secretion by the hypothalamus

D. Direct secretion solely from the adrenal glands

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7. Why is Free Thyroxine (FT4) often preferred over Total T4 when assessing thyroid function?

A. FT4 measures the biologically active portion of the hormone, unaffected by changes in binding proteins.

B. Total T4 cannot be accurately measured in a standard laboratory setting.

C. FT4 can be measured using a simple urine test, making it less invasive.

D. FT4 is more stable and does not fluctuate throughout the day

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8. If a patient has a normal Free Thyroxine (FT4) level but a suppressed (abnormally low) TSH level, what is the most likely diagnosis?

A. Subclinical hyperthyroidism

B. Secondary hypothyroidism

C. Euthyroid sick syndrome

D. Primary hyperthyroidism

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9. What does a Free Thyroxine (FT4) blood test primarily measure?

A. The speed of blood flow through the thyroid gland

B. The level of calcium regulated by the parathyroid glands

C. The total amount of thyroid-stimulating hormone produced by the brain

D. The amount of thyroid hormone that is active and unbound to proteins

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10. Which of the following laboratory profile results is classically expected in a patient with primary hypothyroidism?

A. High TSH, Low Free T3 and Free T4

B. High TSH, High Free T3 and Free T4

C. Low TSH, Normal Free T3, High Free T4

D. Low TSH, High Free T3 and Free T4

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FT4 iClia Quiz

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