Thyroid-Stimulating Hormone Stimulation Test
(TSH Stimulation Test)

TSH is a hormone produced by the pituitary gland when stimulated by low blood levels of T3 and T4. This test is used to diagnose thyroid disease (primary) that results in low blood levels of TSH, such as thyroid removal or chemotherapy, an under-active thyroid gland, inherited thyroid conditions, or infection. Secondary under-active thyroid is caused by other glands (pituitary or hypothalamus), which results in low production of TSH as the result of trauma, injury, or cancer. You will be given a dose of thyroid hormone, and blood samples will be taken. TSH levels will not increase if the disease is within the thyroid gland; TSH levels will increase if disease is within the pituitary or hypothalamus glands.

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