Free Thyroxine (FT4) (Free T4)

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Thyroxine or Free T4 (FT4) is an inactive thyroid hormone produced by the thyroid gland. The liver and other tissues convert T4 into the active T3 thyroid hormone, which drives met abolism. Measuring FT4 levels can help detect thyroid problems that can lead to changes in weight, mood, or heart rate. Free Thyroxine (FT4) is a measure of unbound thyroxine (T4) that is available to the body’s tissues. Diagnostic Blood Test: Free Thyroxine (FT4) Note: This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin. Cease biotin supplementation at least 72 hours prior to blood draw. Show more