202) ANSWER
B) An elevated TSH and decreased T4 levels
RATIONALE
In hypothyroidism, the thyroid gland does not produce thyroxine (T4), despite being stimulated by the pituitary gland (TSH, thyroid-stimulating hormone) to do so. Elevated TSH and T4 levels are seen with secondary hyperthyroidism caused by excessive TSH production by the pituitary. A decreased TSH and elevated T4 are seen with primary hyperthyroidism. Decreased TSH and T4 levels are seen in hypothyroidism secondary to insufficient pituitary secretions. The question requires knowledge of pituitary and thyroid hormone functions. Recall the negative feedback loop of the endocrine system. Eliminate options 1 and 4 because there is an increased T4 level, which would not be seen with primary hypothyroidism.
B) An elevated TSH and decreased T4 levels
RATIONALE
In hypothyroidism, the thyroid gland does not produce thyroxine (T4), despite being stimulated by the pituitary gland (TSH, thyroid-stimulating hormone) to do so. Elevated TSH and T4 levels are seen with secondary hyperthyroidism caused by excessive TSH production by the pituitary. A decreased TSH and elevated T4 are seen with primary hyperthyroidism. Decreased TSH and T4 levels are seen in hypothyroidism secondary to insufficient pituitary secretions. The question requires knowledge of pituitary and thyroid hormone functions. Recall the negative feedback loop of the endocrine system. Eliminate options 1 and 4 because there is an increased T4 level, which would not be seen with primary hypothyroidism.
No comments:
Post a Comment