A laboratory result shows high TSH and low T4. Which explanation is correct?

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Multiple Choice

A laboratory result shows high TSH and low T4. Which explanation is correct?

Explanation:
When TSH is high and T4 is low, it shows a problem at the thyroid gland itself rather than in the pituitary. The pituitary increases TSH when thyroid hormone is low in an attempt to stimulate the thyroid to produce more T4. If T4 remains low despite high TSH, the thyroid isn’t responding adequately—this is primary hypothyroidism. So the best explanation is that the TSH is signaling the thyroid to increase production, but the thyroid isn’t producing enough hormone. The other interpretations aren’t as accurate for describing this pattern of thyroid function.

When TSH is high and T4 is low, it shows a problem at the thyroid gland itself rather than in the pituitary. The pituitary increases TSH when thyroid hormone is low in an attempt to stimulate the thyroid to produce more T4. If T4 remains low despite high TSH, the thyroid isn’t responding adequately—this is primary hypothyroidism. So the best explanation is that the TSH is signaling the thyroid to increase production, but the thyroid isn’t producing enough hormone. The other interpretations aren’t as accurate for describing this pattern of thyroid function.

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