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Application of Biochip Microfluidic Technology to Detect Serum Allergen-specific Immunoglobulin E sIgE
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Racial differences in food allergy diagnostics: Utilization and outcomes at a single center.

Luke Detlor1, Brittany Bindon2, Elizabeth Carr2

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Summary

Racial disparities in food allergy testing may exist. Black patients show higher specific immunoglobulin E (sIgE) levels, potentially leading to fewer oral food challenges (OFCs) and overdiagnosis.

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Area of Science:

  • Immunology and Allergy Research
  • Health Disparities in Clinical Practice
  • Diagnostic Bias in Medicine

Background:

  • Food allergy (FA) prevalence is higher in Black populations in the U.S. compared to White populations.
  • The underlying reasons for this observed racial disparity in food allergy prevalence remain unclear.

Purpose of the Study:

  • To investigate potential bias in food allergy testing contributing to racial differences in FA prevalence.
  • To test the hypothesis that Black patients experience higher rates of false-positive food allergy testing compared to White patients.

Main Methods:

  • Retrospective analysis of 6251 patients evaluated for food allergy at a single center.
  • Comparison of diagnostic test utilization, oral food challenge (OFC) outcomes, and specific immunoglobulin E (sIgE) and skin prick test (SPT) results across racial groups.

Main Results:

  • Black patients exhibited higher average sIgE levels for tree nuts and all food allergens combined compared to White patients.
  • No significant differences were observed in skin prick test (SPT) wheal or flare diameters between racial groups.
  • Black patients underwent OFCs less frequently than White patients (2.2% vs. 4.8%) despite having higher OFC tolerance rates (90.6% vs. 85.7%).

Conclusions:

  • Elevated sIgE levels in Black patients may result in less frequent OFC referrals, potentially contributing to food allergy overdiagnosis.
  • Further research is needed to explore tailoring OFC referral thresholds based on racial and ethnic differences in clinical markers like sIgE.