Aluminium hydroxide adsorbed allergens used in modified RAST

Area of Science:

• Immunology
• Allergy diagnostics
• Biochemistry

Background:

• The conventional radioallergosorbent test (RAST) is a standard method for detecting allergen-specific IgE.
• There is a need for faster and more cost-effective methods for allergy screening and standardization.

Purpose of the Study:

• To develop and validate a modified RAST using aluminium hydroxide gel (AlRAST).
• To assess the performance of AlRAST in terms of speed, cost, validity, sensitivity, and reproducibility.
• To explore the utility of AlRAST for standardizing allergen extracts and immunotherapy products.

Main Methods:

• Modification of the conventional RAST by replacing the solid-phase sorbent with aluminium hydroxide (Al(OH)3) gel.
• Optimization of AlRAST conditions, considering speed, cost, and patient-to-normal individual response ratios.
• Evaluation of AlRAST validity through specificity and parallelism of serum dilution curves.

Main Results:

• AlRAST preparation of allergosorbents is rapid (within 1 hour).
• The method is specific and demonstrates parallelism in serum dilution curves, fulfilling validity criteria.
• Sensitivity and reproducibility are slightly lower than conventional RAST but adequate for routine screening.
• AlRAST can be used for fast screening of unusual allergens and standardization of allergen extracts.

Conclusions:

• AlRAST offers a convenient and efficient alternative to conventional RAST for allergy diagnostics.
• The method is suitable for rapid screening of patients and standardization of allergen extracts and immunotherapy products.
• AlRAST provides a valuable tool for both clinical allergy testing and research applications.