Free T4 [Mass/Vol]
Free T4 measures the amount of unbound thyroxine (T4) circulating in your blood—the form that’s available to convert into active T3. It reflects how well your thyroid is producing hormone, and how much is actually available for metabolic use. It’s more meaningful than Total T4 because it excludes the portion that’s bound to proteins and inactive. Free T4 is especially useful alongside TSH and Free T3 to assess thyroid function, conversion efficiency, and energy regulation.solve real problems with clean design and honest materials.
$4.55 USD