How are FT3 and Allergie related?

The relationship between FT3 (free triiodothyronine) and allergies is not scientifically well-established. FT3 is the active thyroid hormone regulating metabolism, while allergies are immune-mediated hypersensitivities. Mechanistically, thyroid hormones can modulate immune function – for example, by influencing T-cell differentiation or cytokine production. Some studies suggest a link between thyroid dysfunction (e.g., Hashimoto's thyroiditis) and increased allergy prevalence, but the evidence is weak and mostly associative. The provided context contains no specific data on FT3 and allergies. Direct genetic or lab-based predictions are not possible. An FT3 level alone does not indicate allergy risk. If thyroid or allergy issues are suspected, medical evaluation (TSH, fT4, fT3, antibodies, allergy testing) is required. Evidence is rated as 'unclear'.