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Updated: Nov 30, 2025
Application of Biochip Microfluidic Technology to Detect Serum Allergen-specific Immunoglobulin E sIgE
Published on: April 21, 2019
Agreement Between Predictive, Allergen-Specific IgE Values Assessed by ImmunoCAP and IMMULITE 2000 3gAllergy™ Assay
Yasmeen Al Hawi1,2,3, Mizuho Nagao1,2, Kanae Furuya1,4
1Allergy Center and Institute for Clinical Research, National Hospital Organization Mie National Hospital, Tsu, Japan.
Purpose:
ImmunoCAP® (ImmunoCAP) and IMMULITE® 2000 3gAllergy™ (3gAllergy) systems are major quantitative allergen-specific immunoglobulin E (sIgE) assay methods. Due to the heterogeneous nature of allergenic extracts and differences in the assay format, quantitation of allergen-sIgEs is not expected to correlate well between different methods. However, we have recently reported good agreement between the methods in the diagnosis of egg allergy. This study aimed to determine and correlate the predictive values of sIgE by the two systems in the diagnosis of milk and wheat allergies.
Methods:
Children who had undergone oral food challenge (OFC) for the diagnosis of milk and wheat allergies were enrolled. The OFCs were performed to diagnose either true allergy in the 1-year-old group (A) or tolerance in the 2- to 6-year-old group (B). Milk, casein and β-lactoglobulin, and wheat and ω-5 gliadin sIgE values were measured using the 2 systems. The predictive accuracy of each sIgE for the OFC outcome was assessed using receiver operating characteristic (ROC) curves. The probability of a positive OFC outcome was estimated by logistic regression analysis.
Results:
A total of 395 patients were recruited from 7 primary care clinics and 19 hospitals in Japan. Milk and wheat OFCs were performed for 87 and 102 group A patients, and 124 and 82 group B patients, respectively. ROC analysis yielded similar areas under the curve for the 2 assays (0.7-0.9). The log-transformed sIgE data showed a strong linear correlation with the estimated probabilities (R > 0.9).
Conclusions:
The 2 systems may be interchangeable for diagnosis of milk and wheat allergies in young children.
