Thyroid
Total T4
Unit: μg/dLID: T009
What This Test Measures
Total thyroxine (bound + unbound)
Conventional vs. Functional Optimal Range
Conventional "Normal"
4.5-12.0 μg/dLYour doctor says you're "fine" anywhere in this range
Functional Optimal
6.0-11.9 μg/dLThis is where you actually feel great
The gap between these ranges is why you feel terrible with "normal" labs. Conventional medicine waits for disease. Functional medicine optimizes for health.
Gabriel's Take
Total T4 includes bound (inactive) hormone. Less useful than Free T4, but Gabriel's optimal band is 6.0-11.9. Low Total T4 suggests inadequate production. Functional medicine prefers Free T4/Free T3 for precision.
When This Test Is High
Hyperthyroidism, excessive T4 medication
When This Test Is Low
Hypothyroidism, poor thyroid production
Related Conditions
Overall thyroid production capacity
Recommended Follow-Up
Check Free T4 and Free T3 for more accurate functional assessment