Human basophil degranulation test in drug allergy.

Area of Science:

• Immunology
• Pharmacology
• Allergy Diagnostics

Background:

• Drug allergies pose a significant diagnostic challenge.
• In vitro diagnostic methods are sought to complement traditional allergy testing.
• The histamine blood degranulation test (HBDT) is one such method under investigation.

Purpose of the Study:

• To evaluate the diagnostic utility of the HBDT for various drug sensitizations.
• To assess the reliability of HBDT across different drug classes and patient populations.

Main Methods:

• Analysis of 236 patients with suspected drug sensitization (penicillin, streptomycin, sulfamides, pyrazolones, aspirin).
• Inclusion criteria involved confirmed allergies via in vivo methods, clinical history, or negative provocation tests.
• Statistical analysis of 10 parameters for each drug to determine HBDT's diagnostic accuracy.

Main Results:

• HBDT demonstrated usefulness for penicillin, sulfamides, pyrazolones, and aspirin, with 79% positive degranulation in allergic patients.
• The test was less reliable for streptomycin allergy diagnosis.
• In aspirin-sensitive asthmatics, 80% showed positive basophil degranulation; however, it was negative in patients with urticaria/angioedema from aspirin and NSAIDs.

Conclusions:

• HBDT is a potentially valuable in vitro tool for diagnosing allergies to several common drugs.
• Further refinement is needed for streptomycin allergy diagnosis.
• HBDT can help differentiate basophil involvement in specific drug-induced hypersensitivity reactions.