Hypothyroidism should be treated with daily administration of which of the following thyroid hormone preparations ?
Correct answer: D. Thyroxine (T4)
- A. Thyroid extract
- B. Thyroglobulin
- C. Triiodothyronine (T3)
- D. Thyroxine (T4)
Explanation
Daily levothyroxine, synthetic T4, is preferred because it has a longer half-life and is converted in tissues to the active hormone T3. T3 has a shorter action and produces more rapid peaks, making routine replacement less stable.
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