FPIES isn’t a typical food allergy, as it can’t be diagnosed with the food allergy tests that we provide at Arcadia Allergy & Asthma, such as skin prick testing, or blood testing. These tests are ineffective against FPIES as they measure for IgE antibodies and FPIES is a non-IgE food allergy. They are more suited for identifying causes for regular food allergies that result in immediate symptoms like hives, wheezing, and swelling.
FPIES is usually diagnosed by considering the history of the characteristic symptoms and exclusion of various alternative illnesses. The only true way to diagnose this condition is the use of a medically supervised oral food challenge. The food is introduced to the patient in a controlled environment, allowing us to find the cause of your FPIES.