A client is undergoing tests to confirm a diagnosis of hyperthyroidism. What test would be ordered for this client?
A) Thyroid scan
B) Thyroid suppression test
C) TSH stimulation test
D) TRH stimulation test
A
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Thyroid scan (radioscan or scintiscan) is used. For this test, the client ingests radioactive iodine or receives it intravenously (IV). Then a scanogram (x-ray study) is obtained to indicate the amount of radioactivity in the entire body. If the thyroid absorbs a great deal of the radioactive iodine, the thyroid is hyperactive, suggesting possible hyperthyroidism. Thyroid suppression test measures levels of radioactive iodine uptake and serum T4 after 7 to 10 days of receiving thyroid hormone. TSH stimulation test measures body's response to TSH by following levels of radioactive iodine uptake and protein-bound iodine uptake. TRH stimulation test measures TSH levels repeatedly after thyroid-releasing hormone (normally produced by the hypothalamus to stimulate TSH) is given IV.
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