was ist ft3 und ft4 — can a DNA test help?

FT3 (free triiodothyronine) and FT4 (free thyroxine) are thyroid hormones measured in blood to assess thyroid function – for example in hypo- or hyperthyroidism. A DNA test like MyBody-X cannot measure these hormones; that requires a blood test. However, certain genetic variants (e.g., in DIO2, TSHR, PDE8B) can influence T4-to-T3 conversion or thyroid regulation. Effect sizes are generally small, and clinical relevance for individuals is often unclear. Based on available context, MyBody-X does not offer a dedicated thyroid panel. If you want actual FT3/FT4 levels, you need a medical blood test. A DNA test can only provide supplementary hints, not a diagnosis. Caution: direct-to-consumer tests often overstate their utility. For thyroid symptoms, consult an endocrinologist.