Is FT4 useful for Allergie?

FT4 (free thyroxine) is a thyroid hormone and not a direct marker for allergies. Allergies are primarily diagnosed via IgE antibodies, skin prick tests, or provocation tests. While thyroid function can influence the immune system, there is no specific or clinically established link between FT4 levels and allergic conditions. Therefore, using FT4 for allergy assessment lacks scientific evidence and is not recommended. Evidence: unclear – no validated studies support FT4 as an allergy marker. Consumers should rely on established allergy diagnostics and consult an allergist.