The client with hyperthyroid symptoms is having hormone studies done to confirm the diagnosis. Which set of values indicates non–Graves' disease hyperthyroidism?
A. Elevated T3, elevated T4, high TSH levels
B. Elevated T3, normal T4, low TSH levels
C. Elevated T3, low T4, low TSH levels
D. Low T3, normal T4, high TSH levels
A
With hyperthyroidism, both the T3 and T4 blood levels are elevated, causing the hypermetabol-ism. In Graves' disease, the autoantibodies bind to the TSH receptor and activate it, causing an overproduction of thyroid hormones. The increased metabolic rate negatively feeds back and suppresses hypothalamic secretion of thyrotropic hormone, which in turn suppresses thyro-id-stimulating hormone (TSH). When the TSH levels are elevated, causing an increased synthesis of thyroid hormones, the hyperthyroidism is not a result of Graves' disease.
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