Intradermal testing for food and chemical sensitivities: a double-blind controlled study
Summary
This summary is machine-generated.Provocation-neutralization testing for environmental sensitivities is unreliable. Symptoms alone do not accurately identify reactions to foods or chemicals, suggesting it should not guide clinical decisions.
Area Of Science
- Environmental Health
- Allergy and Immunology
- Clinical Diagnosis
Background
- Accurate diagnosis of adverse reactions to foods and chemicals is crucial for managing environmental sensitivities.
- Provocation-neutralization testing is a common but unevaluated method for diagnosing these sensitivities.
- The validity of this controversial technique remains unproven in clinical practice.
Purpose Of The Study
- To investigate the diagnostic validity of intradermal provocation-neutralization testing.
- To evaluate reported adverse reactions in patients at the Nova Scotia Environmental Health Centre.
- To assess the reliability of symptom and skin responses to various substances.
Main Methods
- A double-blind, randomized study involving 132 patients with suspected environmental sensitivities.
- Testing utilized provocation-neutralization guidelines from the American Academy of Environmental Medicine.
- A panel of 13 foods, 9 chemicals, and 4 saline placebos were administered; symptoms and skin reactions were recorded.
Main Results
- A high percentage of patients (70%) reported symptoms to saline placebo injections.
- Skin reactions (wheals) to saline were observed in 15% of patients.
- Patients reacting to saline showed higher reactivity to actual allergens, indicating potential unreliability of placebo testing.
Conclusions
- Provocation-neutralization testing using symptoms alone is not a reliable diagnostic tool for environmental sensitivities.
- Skin responses may offer more reliability but require validation with other challenge methods.
- Clinical decisions should not be based solely on symptom-based provocation-neutralization testing results.
View abstract on PubMed