was ist ft3 — can a microbiome test help?

FT3 (free triiodothyronine) is a thyroid hormone measured in blood that reflects active metabolic status. A microbiome test analyzes gut bacteria composition, not blood hormone levels. There is no validated scientific evidence that a microbiome test can directly inform about FT3 levels or thyroid function. Some companies claim indirect links (e.g., via inflammation markers or iodine metabolism), but these are speculative and not supported by clinical studies. Diagnosis of thyroid disorders requires blood tests (TSH, fT3, fT4). A microbiome test may provide general health insights but cannot replace medical evaluation. Be cautious of marketing hype: no stool test measures hormones or diagnoses thyroid disease.