This test measures the level of the hormone thyroxine (T4) in your blood. The hormone is made by your thyroid gland. The thyroid gland makes T4 in response to thyroid-stimulating hormone (TSH)
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This test measures the level of the hormone thyroxine (T4) in your blood. The hormone is made by your thyroid gland. The thyroid gland makes T4 in response to thyroid-stimulating hormone (TSH)
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