A classic type I allergy is when the immune system produces specific IgE antibodies (immune globulins of the subclass E). These antibodies lead to an immediate allergic reaction. The symptoms appear within seconds or minutes: severe swelling, breathing difficulty, rash, itching skin or even anaphylactic shock.
Someone who has a type I allergy will most probably know which food is causing problems because the symptoms appear right away. Therefore, blood testing is not necessarily needed to identify this kind of allergy. IgE tests are mainly performed for confirmation. ImmuPrint does not detect type I food allergies.