Baked egg food challenges - clinical utility of skin test to baked egg and ovomucoid in children with egg allergy

被引:50
|
作者
Tan, J. W. -L. [1 ,2 ]
Campbell, D. E. [1 ,2 ]
Turner, P. J. [2 ]
Kakakios, A. [1 ,2 ]
Wong, M. [1 ,2 ]
Mehr, S. [1 ,2 ]
Joshi, P. [1 ,2 ]
机构
[1] Childrens Hosp Westmead, Sydney, NSW, Australia
[2] Univ Sydney, Sydney, NSW 2006, Australia
来源
CLINICAL AND EXPERIMENTAL ALLERGY | 2013年 / 43卷 / 10期
关键词
baked egg; egg allergy; food challenge; ovomucoid; IGE CONCENTRATIONS; WHEAT-FLOUR; RESOLUTION; MILK;
D O I
10.1111/cea.12153
中图分类号
R392 [医学免疫学];
学科分类号
100102 ;
摘要
BackgroundMany children with IgE-mediated egg allergy can tolerate products containing extensively heated (baked) egg. Aside from food challenge, there are no tests which reliably predict tolerance to baked egg in egg-allergic individuals. ObjectivesTo determine if skin prick test (SPT) to baked egg (muffin) and ovomucoid can predict the outcome of baked egg challenges in egg allergic patients. MethodsIn this prospective study, children with a recent history of immediate allergic reactions to egg [and corroborative positive SPT or serum-specific IgE (ssIgE) to egg] or those with SPT/ssIgE >95% PPV for egg allergy were invited to undergo an open standardized baked egg (muffin) challenge. SPT to egg white, ovomucoid, and fresh muffin were performed immediately prior to challenge. ResultsOne hundred and forty-three egg allergic children underwent baked egg challenge and of these, 90 (63%) tolerated 1g of egg protein in a baked muffin. Of the 53 positive challenges, eight (15%) had respiratory and/or cardiovascular symptoms. The median SPT diameters in positive challenges compared with negative challenges were baked muffin - 6.0mm/4.0mm and ovomucoid 7.5mm/5.0mm respectively. Receiver operating characteristic (ROC) curves were generated for SPT to baked egg and ovomucoid. The area under the curve was 0.68 for baked egg, and 0.67 for ovomucoid. A muffin SPT of <2mm had a negative predictive value of 88% and an ovomucoid SPT 11mm had a positive predictive value of 100%. Conclusions and Clinical RelevanceA SPT of <2mm to muffin had a high negative predictive value to baked egg challenge. Ovomucoid SPT 11mm was very likely to predict a reaction to baked egg. In these children, deferring the challenge would be appropriate.
引用
收藏
页码:1189 / 1195
页数:7
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