Free T3
Free T3 is the active thyroid hormone responsible for carrying out many of the thyroid's effects throughout the body. It helps regulate energy production, metabolism, body temperature, mental focus, and how efficiently your cells produce and use energy.
Sample Type
ARM BLOOD
Fast results
3 DAYS
What is Free T3?
While TSH acts as the signal and Free T4 serves as the storage form of thyroid hormone, Free T3 is the hormone that actively interacts with cells throughout the body. It helps determine how efficiently your body converts nutrients into energy and plays a major role in metabolic function, cognitive performance, physical stamina, and overall vitality.
Because Free T3 represents the biologically active thyroid hormone available to tissues, it often provides valuable insight into how well thyroid signaling is working at the cellular level.
Some individuals may have TSH and Free T4 levels within expected ranges while still experiencing symptoms associated with suboptimal Free T3 activity.
Tracking Free T3 alongside other thyroid markers can provide a more complete picture of thyroid function, metabolic health, and energy production.
Symptoms of Imbalanced Free T3
Low or high levels may show up in many ways.
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Increased sensitibity to cold
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Brain fog
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Mood changes
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Dry skin
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Fatigue
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Slower metabolism
Frequently paired with:
TSH
You may also consider:
Free T4
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