Lack of uniformity in the investigation and management of suspected β-lactam allergy in children.

Background: Beta-lactam allergy is commonly suspected in childhood with health implications for the individual and wider public. Diagnostic modalities include skin prick tests (SPT), specific immunoglobulin-E (sp-IgE) tests, intradermal tests (IDT) and drug provocation challenges (DPC). The aim of this research was to establish whether variation exists around the world in the investigation and management of beta-lactam allergy.

Methods: Anonymized electronic questionnaire surveys were distributed over 3 months through International Allergy Societies for completion by clinicians who investigate drug allergy in children.

Results: Eighty-one clinicians, practising in 16 countries, completed the questionnaire. There is variability in the selection of diagnostic tests used by clinicians around the world and poor agreement on positive cut-off values (sp-IgE, SPT and IDT) and practical techniques used to measure SPT or IDT wheal diameters. DPC were considered the gold standard investigation with 94% of respondents undertaking DPC over the last 12 months; 64% of respondents considered DPC extremely useful for both exclusion and confirmation of beta-lactam allergy. However, there is a lack of consensus on when and how DPC should be performed. Overall, DPC are safe - only 3% of our respondents had patients who required intramuscular adrenaline and none had patients requiring admission to intensive care.

Conclusions: There is lack of consistency amongst clinicians in different countries in the diagnosis and management of suspected beta-lactam allergy. The development of a standardized approach is a priority.