Flow-cytometric cellular allergen stimulation test in latex allergy

Area of Science:

• Immunology
• Allergy Diagnostics
• Flow Cytometry

Background:

• Flow-cytometric basophil activation tests are increasingly recommended for allergen diagnosis.
• This study evaluates the diagnostic reliability of the flow-cytometric allergen stimulation test (FAST) specifically for latex allergy.
• The correlation of FAST with other in vitro diagnostic parameters was also assessed.

Purpose of the Study:

• To analyze the diagnostic reliability of the flow-cytometric allergen stimulation test (FAST) for latex allergy.
• To assess the reproducibility and accuracy of FAST in an in vitro setting.
• To evaluate the correlation between FAST results and other established allergy diagnostic markers.

Main Methods:

• The study included 43 patients with confirmed latex allergy and 30 control subjects.
• FAST involved stimulating basophils in vitro with latex allergen and measuring CD63 expression via flow cytometry.
• Monoclonal antibodies anti-CD63-PE and anti-IgE FITC were used for double labeling.

Main Results:

• FAST demonstrated excellent reproducibility with an intraclass correlation coefficient of 0.995 (p < 0.0001).
• Using ROC curves, FAST achieved 93% sensitivity and 100% specificity for latex allergy diagnosis.
• Significant positive correlations were found between FAST, specific IgE (CAP), histamine release, and leukotriene production (CAST).

Conclusions:

• The flow-cytometric allergen stimulation test (FAST) is a highly reliable diagnostic tool for IgE-mediated latex allergy.
• FAST exhibits high sensitivity (93%) and specificity (100%) in vitro.
• The test shows excellent reproducibility and correlates well with other allergy diagnostic methods.