Finding out what you are allergic to is an important first step to effective allergy treatment. Today allergy tests are more convenient and accurate than ever before. When combined with a detailed medical history, allergy testing can identify the specific things that trigger your allergic reactions.
Types of Allergy Blood Tests
Allergy blood tests detect and measure the amount of allergen-specific antibodies in your blood. When you come into contact with an allergy trigger, known as an allergen, your body makes antibodies against it.
Allergy blood tests usually screen for at least 10 of the most common allergy triggers, including dust, pet dander, trees, grasses, weeds, and molds related to where you live.
They are also particularly helpful in diagnosing food allergies.
Allergy blood testing is recommended if you:
- Are using a medicine known to interfere with test results and cannot stop taking it for a few days. This would include antihistamines, steroids, and certain antidepressants.
- Cannot tolerate the many needle scratches required for skin testing.
- Have an unstable heart condition.
- Have poorly controlled asthma.
- Have severe eczema, dermatitis, psoriasis, or another severe skin condition.
- Might have an extreme reaction during skin testing or have a history of life-threatening allergic reaction called anaphylaxis.
Allergy blood tests may be referred to as immunoassay tests and include:
Immunoglobulin E (IgE):
IgE antibodies appear in human serum and plasma as a result of sensitization to a specific allergen. Measuring circulating IgE antibodies provides an objective assessment of sensitization to an allergen.
Immunoglobulin E (IgE) is an antibody that’s strongly linked to the body’s allergy response.
Elevated concentrations of IgE are generally thought of in the context of allergic disease.
Enzyme-linked immunosorbent assay (ELISA, or EIA)- ImmunoCAP Specific IgE(PhadiaTop):
ImmunoCAP Phadiatop is a blood test designed to differentiate atopic from non-atopic patients.
Quantifying IgE antibodies with ImmunoCAP Specific IgE accurately evaluates allergy patients.
Using ImmunoCAP Complete Allergens or ImmunoCAP Allergen Components to determine the presence of IgE antibodies offers a broad range of allergens or allergen components to aid the reliable diagnosis of patients with suspected allergy.
ImmunoCAP Phadiatop/Phadiatop Infant
In younger children aged 0-3, allergic sensitization is mostly related to food allergens (such as egg, milk, fish, soybean and peanut) rather than inhalant allergens.
However, antibodies to inhalant allergens such as house dust mites and pets can still appear early in life.
With this in mind, a combination of Phadiatop and the most common food allergens is recommended when testing children for atopy.
Phadiatop and Phadiatop Infant are assays for the graded determination of atopy with semiquantitative or qualitative results.
Accuracy of ImmunoCAP Specific IgE allergen test (Phadiatop)
Living and Managing Allergies
If something irritates you, avoid it. That’s the motto that allergy sufferers must adopt. By tuning into your allergy triggers, you can rein in your reactions.
Tests to remember
- Total IgE (previously called ‘Allergy Phadiatop’)
- Allergy Panels