Is Leaky Gut Test useful for Allergie?

A 'leaky gut' test (e.g., zonulin measurement or lactulose-mannitol test) is not scientifically validated for diagnosing or managing allergies. Allergies are primarily diagnosed via IgE antibody tests, skin prick tests, or clinical history. The theory that increased intestinal permeability triggers allergies is mechanistically plausible but lacks robust clinical evidence. Most commercial tests are not standardized and are not recommended by medical societies. Instead, consult an allergist for proper allergy evaluation. Evidence: mechanistic/unclear.