A commercially available immunoglobulin E-based test for food allergy gives inconsistent results in healthy ponies.
Authors: Dupont S, De Spiegeleer A, Liu D J X, Lefère L, van Doorn D A, Hesta M
Journal: Equine veterinary journal
Summary
# Editorial Summary: IgE-Based Allergy Testing in Ponies Food allergy diagnosis in equine practice relies heavily on commercial serum immunoglobulin E (IgE) testing, yet these assays remain largely unvalidated in horses despite well-documented reliability issues in human and small animal medicine. Researchers evaluated a commercially available IgE test by analysing serum samples from clinically healthy ponies, assessing the consistency and reproducibility of results across multiple testing occasions. The test produced inconsistent findings in these healthy animals, with significant variation between repeated samples—raising serious questions about its diagnostic utility when applied to symptomatic cases. Given that these tests cannot reliably distinguish between healthy and allergic individuals, practitioners should be cautious about basing management or therapeutic decisions solely on positive IgE results; instead, diagnosis should rely on clinical history, dietary elimination trials, and response to dietary modification. The findings underscore the need for more rigorous validation of serological allergy testing in equines and suggest that current commercial IgE assays may lack the specificity and consistency necessary for confident clinical application.
Read the full abstract on PubMed
Practical Takeaways
- •Do not rely on commercial IgE-based allergy tests for diagnosing food allergies in horses and ponies—they produce inconsistent and unreliable results even in healthy animals
- •Consider alternative diagnostic approaches such as elimination diets or clinical assessment rather than serology-based testing for suspected equine food allergies
- •Be cautious of positive IgE test results in your practice, as they may not correlate with actual clinical food allergy and could lead to unnecessary dietary restrictions
Key Findings
- •Commercial IgE-based tests gave inconsistent results in healthy ponies without clinical signs of food allergy
- •Tests demonstrated unreliability as a diagnostic screening method in equids, consistent with findings in other species
- •Results suggest these commercially available tests may produce false positives and are not suitable for equine food allergy diagnosis