Outcome Predictors of Oral Food Challenge in Children

Area of Science:

• Pediatric Allergy and Immunology
• Clinical Immunology
• Diagnostic Medicine

Background:

• Food allergy is a significant cause of severe reactions in children, often necessitating restrictive diets.
• Oral food challenge (OFC) is the gold standard for diagnosis but is resource-intensive and carries risks.
• Identifying predictors for OFC outcomes and reaction severity is crucial for optimizing diagnosis and management.

Purpose of the Study:

• To identify epidemiological, clinical, and laboratory predictors of OFC outcomes in children with suspected immediate-type food allergies.
• To determine factors associated with the severity of reactions during OFC.
• To establish thresholds for allergy tests that predict positive OFC results.

Main Methods:

• Retrospective review of 148 children undergoing hospital-based, open OFCs for suspected immediate-type food reactions.
• Analysis of demographic data, comorbidities, initial reaction characteristics, and sensitization profiles (specific IgE [sIgE], skin prick test [SPT]).
• OFC outcomes and reaction severity (Ring and Messmer scale) were analyzed.

Main Results:

• OFC was positive in 29.7% of children.
• Atopic comorbidities (asthma, atopic dermatitis, allergic rhinitis), elevated sIgE, and larger SPT wheal diameters were significantly associated with positive OFCs (p < 0.01).
• No clinical or laboratory parameters predicted reaction severity during OFC. Optimal thresholds for positive OFC were 0.73 IU/mL for sIgE and 3.5 mm for SPT.

Conclusions:

• OFC remains essential for confirming food allergies in children.
• Predicting OFC reaction severity is unreliable; therefore, OFCs must be conducted in controlled medical settings.
• Low cut-off values for allergy tests predict positive OFC outcomes, highlighting the need for careful interpretation in children with atopic comorbidities.