Skin prick tests should be carried out routinely to determine if the rhinitis is allergic or non-allergic...” “Serum-specific IgE may be requested when skin tests are not possible...” “Allergen immunotherapy within the United Kingdom is recommended in patients with a history of symptoms on allergen exposure and objective confirmation of IgE sensitivity (skin prick test positive and/or elevated allergen-specific IgE)...” [40]. Here, IGHE is linked to rhinitis.