“…This leads to a variety of clinical symptoms, including gastrointestinal, cutaneous, respiratory, systemic and anaphylaxis [1,2]. Because the gastrointestinal mucosa is in most cases the first to contact with various allergens, the gastrointestinal form ranks second (48-67 %) in the overall structure of clinical symptoms of FA [3][4][5], which therefore explains the interest of scientists to investigate its course and early diagnosis in greater depth. Wide variability of clinical manifestations, concomitant sensitization to household and pollen allergens, lack of unified diagnostic algorithms, difficulties in verification of allergic gastrointestinal lesions in children at primary contact with food allergens, high risk of developing anaphylactic reactions when carrying out oral provocation test as the gold standard of FA diagnosis determine prospects for further research, finding noninvasive diagnostic markers of allergy and creating standardized recommendations [6,7].…”