The expanded allergy package (295 food and inhalant allergens) is an advanced immunoassay using microarray or multi-immunoassay technology. It simultaneously measures the level of immunoglobulin E (IgE) antibodies specific to a very large and diverse range of inhalant (airborne) and food allergens in a single serum sample. This comprehensive package allows for a wide-ranging screening to identify specific immune responses, which aids in the differential diagnosis of allergies and guides appropriate therapeutic management.