Understanding how to prepare for an allergy test is essential for accurate results and effective diagnosis. Whether you’re experiencing symptoms like itchy eyes, hives, or breathing difficulties, allergy tests can provide vital insights into the causes of your reactions. At The London Allergy Clinic, with locations in Marylebone and High Barnet, our expert team offers comprehensive testing and guidance to help you navigate your allergy concerns.
Preparation is key to ensuring your test delivers reliable results. Different types of allergy tests require different approaches. In this blog, we’ll explore what to expect and how to prepare for the two main allergy tests: skin prick tests and blood allergy tests.
Preparing for a Skin Prick Test
A skin prick test is a quick and effective method to identify allergies. It works by introducing small amounts of allergens to your skin to measure the specific IgE antibodies that cause reactions. Results are typically available within a few minutes meaning they can be immediately discussed and analysed with the doctor, making it an efficient choice for many patients.
Steps to Prepare:
Avoid Antihistamines: Medications like fexofenadine, loratadine, cetirizine, and Piriton should be discontinued at least 72 hours before the test, if it is safe to do so. These medications can suppress allergic responses, potentially leading to false negative results.
Steroid Use: High-dose steroids, such as prednisolone, may interfere with the test. However, low-dose steroids like Beconase or Dymista nasal sprays are acceptable.
Health Considerations: You cannot undergo a skin prick test if:
You are experiencing a flare-up of hives (urticaria) or swelling (angioedema).
You have recently experienced a major allergic reaction. It is recommended to wait at least four weeks after such an event to ensure accurate results.
Ongoing Allergies: For ongoing conditions like hay fever or pollen-food syndrome, there is no need for a waiting period.
These precautions help ensure the test results are as reliable as possible, providing you with clear insights into potential allergens.
Preparing for a Blood Allergy Test
Blood allergy tests, including the ALEX Allergy Explorer test, measure specific IgE antibodies in your blood to identify allergic sensitivities. These tests can analyse individual allergens or an extensive panel, such as the ALEX test, which examines 295 allergens.
Steps to Prepare:
Medication: Unlike skin prick tests, blood allergy tests do not require you to stop taking antihistamines or other medications. This makes them a more convenient option for some patients.
Timing: Similar to skin prick tests, blood tests should not be performed within four weeks of a major allergic reaction to avoid the refractory period, which can lead to false negative results.
Results Timeline: Blood test results are typically available within 2-3 days, providing a detailed breakdown of your specific sensitivities.
This flexibility makes blood tests a valuable tool for patients who cannot alter their medication schedules.
How The London Allergy Clinic Can Help
The London Allergy Clinic specialises in accurate and evidence-based allergy testing, offering services tailored to your specific needs. Our highly qualified team of specialist clinicians ensures that your results are interpreted within the context of your medical history and symptoms.
Tests We Offer:
Skin Prick Testing: A rapid and reliable method for identifying common allergens.
Specific IgE Blood Tests: Conducted in UKAS-accredited laboratories for precise and dependable results.
Molecular-Component IgE Testing: Provides deeper insights into allergen components for complex cases.
Allergy Explorer Testing: Offers the most comprehensive analysis of 295 allergens in a single test.
The ALEX Allergy Explorer Test
For those seeking the convenience of at-home testing, The London Allergy Clinic provides the ALEX Allergy Explorer panel test. This state-of-the-art test is suitable for adults and children over 18 months and delivers highly accurate results.
Key Features:
Comprehensive Coverage: Tests for 295 allergens, including food allergens (nuts, dairy, wheat), environmental allergens (pollen, dust mites, pet dander), moulds (Aspergillus, Cladosporium), and insect venom (bee, wasp).
Accredited Laboratory: Processed in a UKAS-accredited lab for accuracy.
Ease of Use: No appointment required, with easy-to-read results that help guide diagnosis and treatment.
Trusted by Experts: Regularly used by allergists worldwide.
FAQs About Preparing for an Allergy Test
Can I take medication before an allergy test?
For a skin prick test, avoid antihistamines for at least 72 hours beforehand. However, medications are not restricted for blood allergy tests.
How long should I wait after a major allergic reaction?
It is advisable to wait at least four weeks after a severe reaction before undergoing either type of allergy test to avoid false-negative results.
What allergens can be tested?
The range of allergens includes food (e.g., nuts, dairy), environmental triggers (e.g., pollen, dust mites), and insect venom. The ALEX Allergy Explorer test covers 295 allergens.
How can I book an appointment?
Visit our contact page to schedule a consultation at our Marylebone or High Barnet clinics.
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