TOTAL THYROXINE (T4) (THY)
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A T4 blood test measures the amount of the T4 hormone in the blood.
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A T4 blood test measures the amount of the T4 hormone in the blood. T4 is produced by the thyroid gland. T4 levels are important, because T4 increases numerous enzymes that produce energy for the body. Alternative Name: Thyroxine test.