Specific IgE (sIgE) for food is reported in kU/L and grouped into classes: Class 0 <0.35 kU/L (negative), Class 1 0.35–0.7 (low), Class 2 0.7–3.5 (moderate), Class 3 3.5–17.5 (high), Class 4 17.5–50 (very high), Class 5 50–100, Class 6 >100. Total IgE varies widely. Laboratory results must be interpreted with clinical history; sIgE alone doesn’t confirm allergy—oral food challenge is gold standard.

A specific IgE test is a blood test that measures IgE antibodies to particular allergens (foods, pollens, pets, molds). It detects sensitization and helps confirm suspected allergies when combined with clinical history and skin tests. Results give quantitative IgE levels to guide diagnosis and management, but a positive result shows sensitization—not necessarily clinical allergy—and does not reliably predict reaction severity.

IgE tests (skin-prick or specific IgE blood tests) detect sensitization to foods but aren't perfectly accurate for diagnosing clinical food allergy. They can give false positives and negatives, so results must be interpreted with your clinical history and, when needed, supervised oral food challenges—the diagnostic gold standard. Component-resolved testing and evaluation by an allergist can improve accuracy and risk assessment.

To lower kids’ IgE or allergic burden, identify triggers and reduce exposure (dust mites, pets, pollen), maintain skin barrier with emollients for eczema, avoid tobacco smoke, and manage infections. For persistent allergies, see a pediatrician/allergist — options include allergen immunotherapy (desensitization) and, for eligible severe cases, anti‑IgE biologic therapy (e.g., omalizumab). Always follow specialist testing and guidance.

Total serum IgE varies by age and lab. Generally, values below about 100–150 IU/mL are considered normal; 150–300 IU/mL is mildly raised, >300 IU/mL is high, and levels above roughly 1,000 IU/mL are very high and may indicate severe atopy, parasitic infection, or rare disorders (e.g., hyper‑IgE syndrome). Clinical context and local reference ranges determine significance.

A food allergy blood test measures specific IgE antibodies to particular foods (reported in kUA/L, often with an associated class). Low or undetectable levels make an allergy unlikely; higher levels increase the probability but don’t prove clinical allergy. False positives occur and results must be interpreted with your symptoms and history. Discuss skin testing or a supervised oral food challenge with an allergy specialist for definitive diagnosis.