New research has uncovered significant racial disparities in the diagnosis and testing of food allergies, particularly affecting Black patients. The study, published in the Annals of Allergy, Asthma & Immunology, reveals that Black patients tend to have higher levels of specific immunoglobulin E (sIgE) but are less frequently subjected to oral food challenge tests (OFCs) compared to their White counterparts.
Conducted by a team at the University of Chicago, the retrospective study examined 6,251 patients diagnosed with food allergies at a single healthcare center. The analysis focused on three key diagnostic tests: OFCs, skin prick tests, and sIgE tests. The findings showed that Black patients, despite exhibiting higher mean sIgE values for allergens like tree nuts and other foods, were less likely to receive OFC tests (2.2% compared to 4.8% for White patients).
Interestingly, the study also found that when Black patients did undergo OFCs, they had a higher success rate, with 90.6% tolerating the foods compared to 85.7% of White patients. This suggests a potential overdiagnosis in Black patients who might benefit from more frequent OFC testing.
Dr. Christina E. Ciaccio, the study’s corresponding author, emphasized the need for a deeper understanding of how various factors such as social and environmental influences affect sIgE interpretations. The study indicates that current diagnostic thresholds might not be equally effective across different racial groups.
Limitations of the study include its retrospective nature, which restricted the ability to explore individual reasons behind the disparities in OFC usage. The researchers also faced challenges in analyzing allergen-specific outcomes due to sample size constraints.
The study was led by Luke Detlor from the University of Chicago’s Pritzker School of Medicine, with no conflicts of interest or funding sources reported.
