Email updates

Keep up to date with the latest news and content from AACI and BioMed Central.

Open Access Highly Accessed Research

Skin prick testing with extensively heated milk or egg products helps predict the outcome of an oral food challenge: a retrospective analysis

Zein Faraj1 and Harold L Kim12*

Author Affiliations

1 Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada

2 Department of Medicine, University of Western Ontario, London, ON, Canada

For all author emails, please log on.

Allergy, Asthma & Clinical Immunology 2012, 8:5  doi:10.1186/1710-1492-8-5

Published: 16 May 2012

Abstract

Background

Cow’s milk and hen’s egg are the most frequently encountered food allergens in the pediatric population. Skin prick testing (SPT) with commercial extracts followed by an oral food challenge (OFC) are routinely performed in the diagnostic investigation of these children. Recent evidence suggests that milk-allergic and/or egg-allergic individuals can often tolerate extensively heated (EH) forms of these foods. This study evaluated the predictive value of a negative SPT with EH milk or egg in determining whether a child would tolerate an OFC to the EH food product.

Methods

Charts from a single allergy clinic were reviewed for any patient with a negative SPT to EH milk or egg, prepared in the form of a muffin. Data collected included age, sex, symptoms of food allergy, co-morbidities and the success of the OFC to the muffin.

Results

Fifty-eight patients had negative SPTs to the EH milk or egg in a muffin and underwent OFC to the appropriate EH food in the outpatient clinic. Fifty-five of these patients tolerated the OFC. The negative predictive value for the SPT with the EH food product was 94.8%.

Conclusions

SPT with EH milk or egg products was predictive of a successful OFC to the same food. Larger prospective studies are required to substantiate these findings.