1,25-dihydroxyvitamin D (calcitriol)
This test measures 1,25-dihydroxyvitamin D, the biologically active form of vitamin D. It is used to investigate calcium imbalance, kidney disease and...
The Individual Allergen test measures specific IgE antibodies to a single allergen. It helps accurately identify what is triggering allergic symptoms.
Turnaround time
1 day
Biomarkers count
1
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Home visits require at least 24 hours notice.
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The Individual Allergen test, also known as a specific IgE test, measures the immune system’s response to one specific allergen. This could be a food, pollen, animal dander, mould, insect venom, or environmental substance.
When the body is sensitised to an allergen, it produces IgE antibodies directed specifically against that trigger. Measuring allergen-specific IgE allows targeted identification of allergic sensitisation rather than general allergy tendency.
This test is commonly used when symptoms point to a particular suspected allergen and precise identification is required.
Identifying the exact allergen responsible for symptoms allows targeted avoidance, treatment, and improved symptom control.
You may need an Individual Allergen test if you:
Symptoms commonly linked to allergen sensitisation include:
You can access Individual Allergen testing UK-wide through two options:
Your blood sample is analysed in an accredited UK laboratory for allergen-specific IgE, and results are delivered securely.
Low or undetectable specific IgE
No sensitisation detected to the tested allergen.
Typical UK interpretation:
Moderate specific IgE levels
Indicates sensitisation; symptoms may occur on exposure.
Typical UK interpretation:
High specific IgE levels
Strong sensitisation with higher likelihood of clinical reaction.
Typical UK interpretation:
Clinical symptoms and exposure history are essential when interpreting results.
Simple steps to get your results
Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
Take control of your health with London Blood Tests
WhatsApp UsFollow these guidelines for accurate results
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.
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