FPIES DIAGNOSIS: INTERVIEW & PHYSICAL EXAM
With no lab test to identify FPIES, it must be diagnosed the classic way: with an interview and physical exam by a doctor. An allergist or pediatric gastroenterologist will take a detailed history of the symptoms, including foods eaten and a timeline of reactions.
The onset of acute symptoms after a history of chronic symptoms confirms the diagnosis of chronic FPIES — which is often only diagnosed looking back or after ruling out more common digestive problems.
Once FPIES is suspected, an oral food challenge may be performed under medical supervision to confirm the diagnosis.