Do not waste your money on quackery/dubious tests: "The following procedures are not valid for managing food allergies: Neurological Stress Reduction Therapy (NRST) purports to use a BAX 3000 device to assess and treat allergies and many other conditions with a 'light and sound energy relaxation technique' that supposedly identifies problematic substances and conditions the body not to react negatively to them."
Source: https://quackwatch.org/related/Tests/allergytests/
Proceed with caution: "There are methods of allergy testing that the American Academy of Allergy, Asthma & Immunology (AAAAI) believes are not useful, effective or may lead to inappropriate diagnosis and treatment. These include: allergy screening tests done in supermarkets or drug stores, home testing, applied kinesiology (allergy testing by testing muscle strength or weakness), cytotoxicity testing for food allergy, Rinkel skin titration method, provocative neutralization testing, Immunoglobulin G (IgG) testing for food allergy or sublingual provocation."
Source: https://www.aaaai.org/conditions-and-treatments/library/allergy-library/allergy-testing