Thyroid
Free Thyroxine Index
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Thyroid
Iodine [Mass/Vol]
Iodine is essential for building thyroid hormones — it's literally the “I” in T3 and T4. Low iodine means your thyroid struggles to function, leading to fatigue, cold intolerance, brain fog, and weight gain. On the flip side, too much iodine (especially in supplement form) can disrupt thyroid function, especially in those with autoimmune tendencies like Hashimoto’s.
- Unit
- ug/mL
- Health impacts
- Mood · Energy · Thyroid
In your dashboard
Your trend, against your optimal range.
Example data · how your trend would appear once you test
At every level
What we'd do at any value.
Exploring
65.0ug/mL
LowOptimal 40.0–90.0High
In your optimal zone
Habits that hold this position.
No specific guidance for this zone yet. We're working on it and will update this soon.
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LabCorpTest code: 070034$55
QuestTest code: 16599$55
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