A medical assistant is reviewing the laboratory results for a patient with a diagnosis of primary hyperthyroidism. Which of the following levels of Thyroid-Stimulating Hormone (TSH) is the expected finding for this condition?
In primary hyperthyroidism, the thyroid gland is overactive and produces an excess of thyroid hormones (T3 and T4). These high levels of circulating thyroid hormones signal the pituitary gland, via a negative feedback mechanism, to reduce its production of Thyroid-Stimulating Hormone (TSH). Consequently, the expected laboratory finding for primary hyperthyroidism is a decreased TSH level. An increased TSH level is characteristic of primary hypothyroidism, where the pituitary gland attempts to stimulate an underactive thyroid.
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What is primary hyperthyroidism?
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How does the feedback mechanism between the thyroid gland and TSH work?
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What are the differences between TSH and thyroid hormones?
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