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Actually when there is a suspicion of food allergy, the OPT is the gold standard for the diagnosis. During the OPT we give increasing doses of the allergen to the patient and evaluate threshold causing a clinical reaction. This test is associated with a risk of strong allergic reaction and need a medical supervision.
Standard allergy test, like skin test or specific IgE test, can't be use for the diagnosis of these allergy. Some publications demonstrate that these tests lack sensibility and specificity for child food allergy diagnosis.
New tests have to be develop to diagnosis child food allergy without risks. The BAT is a cellular test able to evaluate the basophiles activation by specific allergen in vitro. This test allow us to evaluate more physiologically the sensitization of patients to an allergen. It is already used in drug allergy and it has been evaluated in infant milk allergy in an other clinical trial.
In this study we want to evaluate the sensitivity of BAT to the diagnosis of child food allergy compare to the gold standard test OPT. We will evaluate the BAT on 140 children with food allergy and compare this results with the OPT at the same time. If the BAT results can predict the sensitivity of children to food allergen, it could limit the use of the OPT and reduce the risk of this test.
Child food allergy represent 6 to 8% of child in industrialised country. One third of these child will develop severe reactions and one third will experience multiple allergy. In France, there is few epidemiologic data but in 2005 F. Rancé evaluated the prevalence of these allergy to 6.7% of school child. Within the food allergen, peanut, egg and milk are the most common.
Currently, there is two diagnostic possibilities:
- A strong allergic reaction with identified allergens and specific IgE positive, making it highly probable diagnosis.
- A moderate allergic reaction with only suspicion on the allergen, without definitive diagnosis.
When there is a suspected allergy, the gold standard to the diagnosis is the OPT. This test consist of the gradual ingestion of the suspected food allergen to evaluate the threshold causing a clinical reaction. The OPT must be performed under medical supervision in a hospital due to the risk of severe allergic reaction.
The OPT is the gold standard in allergy diagnosis. The other tests (prick test, IgE specific measure…) are not sensitive enough. Furthermore, the level of IgE specific was not related to the risk to develop clinical reaction to the food allergen. Some studies have try to combine skin tests with the result of IgE specific measure but the sensitivity did not improve enough.
New tests have to be develop to diagnosis child food allergy without risks. The BAT is a cellular test able to evaluate, in blood, the basophiles activation by specific allergen in vitro. This test measure by flow cytométrie the expression of activation molecule (CD63) on basophiles (CCR3+) after incubation with the allergen. If the patient is sensitize to the allergen, the percentage of active basophiles will be higher than in non sensitize people. This test allow us to evaluate more physiologically the sensitization of patients to an allergen. This test has already been tested for drug allergy and milk allergy in child. This clinical trial demonstrated that in mill allergy, the BAT had a good sensitivity (91% and sensibility (96%). Furthermore, this study could determined the threshold of the BAT in child food allergy (6% of activated basophiles).
In light of these results, we want to evaluate the advantage of BAT compare to OPT in child with allergy to egg or peanut.
During this study, we will perform BAT on a blood sample from child suspected of food allergy (egg or peanut) before OPT and we will compare its results with the OPT results. The primary objective of this study is to evaluate the BAT interest to predict the results of OPT by analysing the sensibility, specificity, positive predictive value, negative predictive value of BAT.
If these study demonstrate that BAT can predict OPT results for child food allergy, we will be able to reduce the number of OPT for these patients and reduce the risk of anaphylactic shock during OPT.
Endpoint Classification: Bio-equivalence Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Diagnostic
Allergy to Egg
Basophil Activation Test
University Hospital, Rouen
Published on BioPortfolio: 2015-02-16T21:18:29-0500
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An in vitro test used in the diagnosis of allergies including drug hypersensitivity. The allergen is added to the patient's white blood cells and the subsequent histamine release is measured.
The secretion of histamine from mast cell and basophil granules by exocytosis. This can be initiated by a number of factors, all of which involve binding of IgE, cross-linked by antigen, to the mast cell or basophil's Fc receptors. Once released, histamine binds to a number of different target cell receptors and exerts a wide variety of effects.
A projective test used to evaluate a broad range of personality variables including pathology of thought and perception. The subject's responses to inkblot prints are scored along with subjective interpretation by the test administrator.
A test to determine the lowest sound intensity level at which fifty percent or more of the spondaic test words (words of two syllables having equal stress) are repeated correctly.
Tests of accuracy in pronouncing speech sounds, e.g., Iowa Pressure Articulation Test, Deep Test of Articulation, Templin-Darley Tests of Articulation, Goldman-Fristoe Test of Articulation, Screening Speech Articulation Test, Arizona Articulation Proficiency Scale.
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