Allergy Testing: Specific IgE, Skin Prick, Component Testing, and Why Large Panels Create More Problems Than They Solve
Allergy Testing: Specific IgE, Skin Prick, Component Testing, and Why Large Panels Create More Problems Than They Solve A positive allergy test doesn't mean allergy. Sensitization ≠ clinical allergy. And shotgun IgE panels are how patients end up on unnecessary elimination diets. The Fundamental Principle Sensitization ≠ Clinical Allergy. A positive specific IgE or skin prick test means the patient has IgE antibodies against that allergen (sensitization). It does NOT mean they will have a clinical reaction on exposure. Up to 50–60% of food-specific IgE positives are clinically irrelevant. The test must ALWAYS be interpreted in the context of clinical history. The Tests Skin Prick Testing (SPT) The clinical gold standard for aeroallergen and food allergy testing. Immediate (15–20 minute) wheal-and-flare response. Advantages: rapid, inexpensive, high sensitivity. Limitations: must stop antihistamines 3–7 days prior; cannot perform on patients with severe eczema, dermatographi...