T4, or thyroxine, is a hormone produced by the thyroid gland to help control metabolism and growth. It is also prepared synthetically for treatment of hypothyroidism and myxedema. Laboratories commonly measure Total T4, which reflects the total amount of T4 present in the blood, both unavailable and free; Free T4 reflects the amount of biologically active T4. Synthroid (Levothyroxine) is a synthetic form of thyroxine.
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