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T3 |
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- This test measures the amount of T3, which is a form of thyroid hormone, in the blood. The test is done to evaluate thyroid function, especially when a person is thought to have an overactive or underactive thyroid. |
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T4 |
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- This test measures the amount of T4, which is also called thyroxine. T4 is a form of thyroid hormone in the blood. The test is usually performed to evaluate thyroid function. The levels of thyroid hormone in the blood are important to health. Thyroid hormone controls the body's rate of basal metabolism, which is the energy needed to keep the body functioning at rest. |
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Hashimoto's thyroiditis |
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