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Inicio Allergologia et Immunopathologia Predictive value of the number of adverse reaction episodes for the IgE-mediated...
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Vol. 47. Issue 3.
Pages 277-281 (May - June 2019)
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Vol. 47. Issue 3.
Pages 277-281 (May - June 2019)
Original Article
DOI: 10.1016/j.aller.2018.10.006
Predictive value of the number of adverse reaction episodes for the IgE-mediated food allergy diagnosis
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S. Miceli Sopoa,
Corresponding author
, G. Gurnaria, S. Monacoa, A. Romanoa, L. Liottib, B. Cuomoc, I. Dello Iaconod, L. Badinae, G. Longoe, M. Calvanif, A. Giannonef, C. Calabròg, G. Scalag, M.C. Vergah
a Allergy Unit, Pediatrics Area, Department of Woman and Child Health, Policlinico Gemelli Universitary Foundation IRCCS, Catholic University of Sacre Hearth, Rome, Italy
b Allergy Unit, Pediatric Clinic, Civil Hospital, Senigallia, Italy
c Allergy Unit, Pediatric Clinic, Belcolle Hospital, Viterbo, Italy
d Allergy Unit, Fatebenefratelli Hospital, Benevento, Italy
e Allergy Unit, Institute for Maternal and Child Health, IRCCS “Burlo Garofolo”, Trieste, Italy
f Pediatric Department, San Camillo de Lellis Hospital, Rome, Italy
g Allergy Unit, Loreto Crispi Hospital, Naples, Italy
h Primary Care Pediatrics, ASL Salerno, Italy
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Tables (2)
Table 1. Outcome of the OFC in relation to the number of ARE.
Table 2. Diagnostic accuracy of the number of ARE.
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Abstract
Introduction and objectives

The reproducibility of the adverse reaction increases the suggestiveness of a history of food allergy. However, the positive predictive value (PPV) of multiple adverse reaction episodes for the diagnosis of IgE-mediated food allergy is not known. This evaluation was the objective of our study.

Patients and methods

We retrospectively studied 180 children with a history of non-anaphylactic adverse reactions after the ingestion of a food. All children had the prick test positive for the offending food and performed the oral food challenge (OFC) within 12 months after the last adverse reaction episode (ARE). We have evaluated whether increasing the number of ARE increased the probability that the OFC would be positive (failed).

Results

93 patients (52%) presented one ARE, 49 (27%) presented two ARE, 24 (13%) presented three ARE, 14 (8%) patients presentedfour ARE. The OFC was positive in 94/180 (52%). The outcome of the OFC was found to be positively correlated with the number of ARE (OR=1.56; 95% CI=1.16–2.09; p=0.003). A PPV=100% was observed with a number of AREfive.

Conclusions

The number of ARE is an important predictor of the diagnosis of food allergy, although less than we would have imagined. The number of ARE could be used to increase the predictability of the diagnostic tests currently in use, to define clinical prediction rules alternative to OFC and easy to use in clinical practice.

Keywords:
Diagnosis
Food allergy
History
Oral food challenge
Positive predictive value
Abbreviations:
ARE
CI
EAACI
IF
IgE-FA
LR+
LR−
NPV
OFC
OR
PbP
PPV
ROC
SD
SPT

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