Comprehensive Thyroid Panel: Why TSH Alone Misses Low T3 and Sluggish Fat Loss
Your standard thyroid test came back "normal," but your temperature is low, energy is crashed, and fat won't budge. Understanding peripheral T4-to-T3 conversion and Reverse T3.
Biomarker Specification
The thyroid gland serves as the metabolic furnace of the human body, setting the baseline rate of oxygen consumption and basal metabolic expenditure in every nucleated cell.
The Deiodinase Bottleneck
The thyroid produces mostly T4 (thyroxine), which is an inactive pro-hormone. For your metabolism to fire, T4 must have an iodine atom removed by the enzyme 5'-deiodinase in liver, kidney, and skeletal muscle cells to become active Free T3. Caloric deprivation and chronic cortisol divert T4 into Reverse T3 (rT3), an inactive decoy that plugs into thyroid receptors and blocks fat burning.
Get The 7-Day Medical Tests Action Protocol
Download our actionable, 1-page clinical protocol summary, printable testing sheet, and weekly dosage tracker to put this guide into practice immediately.
