Allergen Test – Types, Procedure and Results
An allergen test is a diagnostic procedure used to identify substances that trigger allergic reactions in a person, enabling targeted treatment decisions.
Things worth knowing about "Allergen Test"
An allergen test is a diagnostic procedure used to identify substances that trigger allergic reactions in a person, enabling targeted treatment decisions.
What is an Allergen Test?
An allergen test is a medical examination designed to identify specific substances – known as allergens – that provoke an allergic response in a patient. Common allergens include pollen, dust mites, pet dander, foods, insect venom, and chemical agents. These tests are typically conducted by specialists such as allergists, dermatologists, or ENT physicians.
When is an Allergen Test Recommended?
An allergen test is recommended when patients experience recurring symptoms that suggest an allergic reaction, including:
- Persistent runny nose or sneezing fits
- Itching, skin rash, or hives
- Asthma-like symptoms or shortness of breath
- Watery or red eyes
- Gastrointestinal complaints after eating
- History of anaphylactic reactions
Types of Allergen Tests
Skin Prick Test
The skin prick test is the most commonly used method. Small amounts of different allergens are applied to the forearm skin and lightly pricked through. After approximately 15–20 minutes, the skin reaction is assessed. A raised wheal or redness indicates sensitization to the respective allergen.
Intradermal Test
In this procedure, a small amount of allergen is injected directly into the skin. It is more sensitive than the skin prick test and is used when the prick test is negative but an allergy is still suspected.
Patch Test (Epicutaneous Test)
The patch test is used to diagnose contact allergies. Suspected allergenic substances are applied to adhesive patches and placed on the patient's back for 48 hours. Skin reactions are evaluated at 48 and 72 hours.
Blood Test (Specific IgE)
A blood test involves taking a blood sample and analyzing it in the laboratory for specific IgE antibodies. Elevated IgE levels against a particular allergen confirm sensitization. This method is especially suitable for patients who cannot undergo skin testing, for example those with severe eczema or currently taking antihistamines.
Provocation Test
In a provocation test, the patient is deliberately and in a controlled manner exposed to an allergen to trigger and document an allergic reaction. This test is conducted under medical supervision and is primarily used for food or drug allergies.
Procedure and Preparation
Before an allergen test, patients should discontinue certain medications such as antihistamines or systemic corticosteroids in consultation with their doctor, as these can distort test results. The physician will also take a thorough medical history to determine which allergens are most relevant to test.
Interpretation of Results
A positive test result indicates sensitization to an allergen but does not necessarily confirm a clinically relevant allergy. Results must always be interpreted in the context of the patient's symptoms and medical history. A negative result does not entirely rule out an allergy.
Treatment Following an Allergen Test
Once the triggering allergen has been identified, several treatment approaches are available:
- Allergen avoidance: Consistently avoiding the identified allergen
- Pharmacological therapy: Antihistamines, corticosteroids, or biologics for symptom control
- Allergen immunotherapy (desensitization): A long-term treatment that gradually acclimates the body to the allergen, reducing hypersensitivity over time
References
- World Allergy Organization (WAO) – International Consensus on Allergy Testing Guidelines, 2022. Available at: www.worldallergy.org
- German Society for Allergology and Clinical Immunology (DGAKI) – Guidelines for the Diagnosis and Treatment of Allergies, 2021.
- Bousquet J. et al. – Allergic Rhinitis and its Impact on Asthma (ARIA) Guidelines. Allergy, 2019; 74(Suppl 108): 1–232.
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