15/04/2026
Serum allergy testing in horses is one of the most misunderstood tools in equine medicine. 🐴
A common misconception is that a “positive” blood test confirms an allergy—and a “negative” result rules it out. In reality, serum IgE testing is far more complex. Results can reflect exposure, cross-reactivity, or normal immune variation, rather than true clinical disease.
That’s why interpretation matters more than the test result itself. Serum allergy testing results are best used to direct immunotherapy development, not to confirm allergy as a condition or direct elimination of anything in the horse’s environment. And an important PSA: Allergy testing is not a reliable means of testing food allergies, unfortunately.
Good medicine is about interpretation of specific test results in the context of individual patients. 🤓