Can IgE help with fertility?

Whether IgE (immunoglobulin E) can influence fertility is not scientifically settled. IgE is primarily known for its role in allergies and parasite defense. Some studies suggest a possible involvement of IgE in the female reproductive tract, e.g., during embryo implantation or in recurrent pregnancy loss linked to immune dysregulation. However, the evidence is weak and inconsistent. There are no validated biomarkers or tests that recommend IgE levels for fertility assessment or optimization. Most findings come from mechanistic or animal studies. Clinically, IgE is measured mainly in allergy contexts. Individuals with fertility concerns should consult reproductive specialists rather than rely on direct-to-consumer IgE tests, which are not approved for fertility evaluation and may lead to misinterpretation.