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Updated: May 24, 2025
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Published on: May 31, 2021
Accuracy of bead-based epitope assay testing for peanut allergy diagnosis: Real-world pediatric population study
Jessica M Palmieri1, Vibha Szafron2, Melissa Hearrell2
1Section of Allergy and Immunology, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois; Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Center for Food Allergy & Asthma Research, Part of the Institute for Public Health and Medicine at Northwestern University Feinberg School of Medicine and Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois.
Background:
Peanut allergy accounts for 25% of children with food allergy, but current testing has a poor positive predictive value (PPV) and low accuracy, with peanut allergy overdiagnoses estimated to be greater than 60% in clinical settings. New methods for peanut allergy diagnosis through bead-based epitope assay (BBEA) testing with Ara h 2.008 and Ara h 2.019 epitopes have retrospectively demonstrated improved accuracy in peanut allergy diagnosis.
Objective:
To prospectively evaluate BBEA testing for peanut allergy in a real-world racially diverse clinical population with determination of BBEA testing accuracy, PPV, negative predictive value (NPV), sensitivity, and specificity.
Methods:
Patients from a tertiary food allergy clinic underwent standard testing for peanut allergy, including skin prick testing, specific IgE testing, and evaluation of peanut IgE component (Ara h 1, 2, 3, 6, 8, and 9) testing. BBEA evaluation to the Ara h 2.008 and Ara h 2.019 epitopes was performed on all patients, and oral food challenges were offered to patients with indeterminate standard testing.
Results:
In this real-world population study, BBEA testing has a 96% accuracy, 96% PPV, 94% NPV, 98% sensitivity, and 89.5% specificity. For children younger than 2 years and Black children, the accuracy, PPV, NPV, sensitivity, and specificity were 100%. The NPV was 100% in patients with no peanut ingestion or reaction history.
Conclusion:
The use of BBEA testing has a higher diagnostic accuracy compared with standard food allergy testing and may decrease need for unnecessary oral food challenges in clinical settings.
