T4 [Mass/Vol]
Total T4 measures the full amount of thyroxine in your blood—both bound and unbound. T4 is the main hormone produced by your thyroid and acts as the precursor to T3, the active form. Most of it is bound to transport proteins and inactive, so while it gives you a good sense of production, it doesn’t reflect actual activity without looking at T3, T3 Uptake, or Free T4. Still, it’s a valuable marker for thyroid output and upstream hormone availability.solve real problems with clean design and honest materials.
$6.88 USD