Determination of total and specific IgE using UNICAP 100: comparative study with the CAP system

Area of Science:

• Allergy diagnostics
• Immunology
• Clinical chemistry

Background:

• Serum specific IgE tests historically had lower sensitivity than skin tests.
• The CAP system improved sensitivity but remained semi-automatic with daily calibration needs.
• The UNICAP 100 was developed as a fully automated system for IgE and Eosinophil Cationic Protein analysis.

Purpose of the Study:

• To evaluate the practicality and reliability of the UNICAP 100.
• To compare UNICAP 100 performance against the CAP System for total and specific IgE.
• To assess diagnostic sensitivity and specificity using skin tests as a reference in pediatric patients.

Main Methods:

• Comparison of UNICAP 100 with the CAP System in 150 pediatric patients.
• Assessment of total and specific IgE determination.
• Skin tests used as the gold standard for diagnostic accuracy evaluation.

Main Results:

• UNIPAC 100 demonstrated excellent interchangeability with the CAP System (correlation coefficients 0.985-0.998).
• Intra-series imprecision for total IgE was 2.1-3.6% and specific IgE was 2.2-5.1%.
• Inter-series imprecision was 3.3-7.7% for total IgE and 5.2-8.9% for specific IgE, with diagnostic sensitivity of 70-95% and specificity of 87-100%.

Conclusions:

• UNIPAC 100 provides interchangeable results with the CAP System.
• The UNICAP 100 offers significant advantages through complete automation and simplified calibration.
• This automated system enhances the practicality and reliability of specific IgE testing in allergy diagnostics.