Is food allergy testing reliable in pediatric atopic dermatitis? A population-based study

Area of Science:

• Pediatrics
• Allergy and Immunology
• Dermatology

Background:

• Infants with atopic dermatitis (AD) are at increased risk for developing food allergies.
• Accurate prediction of clinical food allergy is crucial for appropriate management and prevention strategies.

Purpose of the Study:

• To evaluate the predictive value and reliability of serologic testing (specific serum IgE) for identifying clinical food allergy in infants with AD.
• To assess the performance characteristics of IgE testing in a population-based cohort.

Main Methods:

• A cohort of 40 infants (3-18 months) with AD was followed for 3 years.
• Clinical food allergy was assessed through parental interviews regarding immediate reactions (skin, gut, respiratory).
• Specific serum IgE levels for six common foods were measured at 3-5 years of age.

Main Results:

• 23% of infants developed clinical food allergy to at least one food.
• Observed reaction rates were 5% for milk, 11% for peanut, and 18% for egg.
• 30% of food-specific IgE tests were above normal, with generally low predictive reliability, especially for egg allergy.

Conclusions:

• Serologic testing for food allergy in infants with AD has limited predictive reliability, particularly for egg allergy.
• Misinterpretation of allergy test results by physicians and patients can lead to inappropriate management of AD and food allergies.