ImmunoCAP assays: Pros and cons in allergology

Area of Science:

• Allergology and Immunology
• Diagnostic Assay Technology
• Molecular Medicine

Background:

• Allergy diagnosis relies on allergen-specific IgE measurements and clinical history.
• Advancements in allergen extract characterization and assay technology have improved diagnostic capabilities.
• ImmunoCAP IgE assays, including singleplex and multiplex (ISAC) formats, are widely used.

Purpose of the Study:

• To review the uses, benefits, drawbacks, and limitations of ImmunoCAP IgE assays.
• To compare traditional allergen extracts with newer allergen molecules in diagnostic assays.
• To highlight the role of molecular allergology in advancing precision medicine.

Main Methods:

• Discussion of ImmunoCAP IgE assays (singleplex) and Immuno Solid-phase Allergen Chip (ISAC) (multiplex).
• Evaluation of assay performance, including quantification, interference, and range.
• Analysis of allergen extracts versus specific allergen molecules for IgE detection.

Main Results:

• ImmunoCAP provides quantified IgE levels without IgG interference, but extracts have limited composition.
• ISAC offers comprehensive IgE profiling from small serum volumes but is semiquantitative and costly.
• Allergen molecules enhance analytic specificity, enabling molecular-level IgE response analysis.

Conclusions:

• ImmunoCAP allergen extracts serve as effective screening tools.
• Allergen molecules provide detailed IgE responses, crucial for precision medicine in allergy.
• Molecular allergology represents a significant step towards personalized allergy diagnosis and treatment.