Individual Allergen
Private Individual Allergen blood test in London for £55, measuring specific IgE sensitisation to one selected food, pollen or environmental allergen.
Turnaround time
1 business day
Biomarkers count
1
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Overview of the Individual Allergen Test
The Individual Allergen blood test measures specific IgE antibodies directed against one selected allergen.
The test contains 1 biomarker: Allergy - Individual Allergens.
The selected allergen may be a food, pollen, animal allergen, house dust mite, mould, insect venom or another substance available through the laboratory's allergen menu.
IgE-mediated allergy occurs when the immune system becomes sensitised to a particular allergen and produces IgE antibodies directed against it.
On subsequent exposure, this immune response can trigger release of histamine and other inflammatory mediators.
The resulting symptoms can include sneezing, itchy eyes, hives, swelling, gastrointestinal symptoms, wheezing or, in some circumstances, anaphylaxis.
Specific IgE testing is most useful when the allergen being measured has been chosen according to a credible history of symptoms and exposure.
A positive specific-IgE result means sensitisation has been detected.
Sensitisation is not identical to clinical allergy.
Some people have detectable IgE to an allergen but can tolerate exposure without developing symptoms.
Similarly, the concentration of specific IgE does not reliably predict how severe a future allergic reaction will be.
A negative result makes IgE-mediated sensitisation to the tested allergen less likely but does not provide a complete explanation for every possible reaction.
The test is therefore best interpreted alongside the nature, timing and reproducibility of symptoms.
What Does the Individual Allergen Test Check?
The test focuses on one specifically chosen suspected trigger rather than screening large numbers of unrelated allergens. This test measures 1 biomarker.
Allergy - Individual Allergens
Measures specific IgE antibodies against one selected allergen to assess whether IgE sensitisation to that particular substance is present.
Who May Benefit From the Individual Allergen Test?
Targeted testing may be particularly useful where symptoms repeatedly follow exposure to one suspected food, pollen, animal or environmental trigger.
People who repeatedly react after eating one particular food - Targeted specific-IgE testing may provide more useful information than broad indiscriminate screening.
People with seasonal symptoms linked to a particular pollen period - An individual pollen allergen can be selected according to the clinical history.
People whose symptoms occur around a particular animal - Cat, dog or other animal-specific IgE may be appropriate.
People with suspected house dust mite or mould allergy - Environmental allergens can be assessed individually.
People with a previous uncertain allergy result - Repeat or targeted testing may clarify whether sensitisation remains detectable.
People taking antihistamines who cannot easily stop them - Serum specific-IgE testing is generally not suppressed by antihistamines in the way skin-prick testing can be.
People with eczema or extensive skin disease that makes skin-prick testing difficult - Blood testing provides a non-skin alternative.
People who want to avoid unnecessary broad allergy panels - One carefully selected allergen may be more clinically meaningful than testing many unrelated substances.
How to Prepare
The test should be chosen according to the clinical history rather than selecting an unrelated allergen simply because it is available.
No deliberate allergen challenge is required.
Symptoms and Reasons to Consider the Individual Allergen Test
IgE-mediated allergy generally causes symptoms soon after exposure, although the pattern depends on the allergen and route of contact.
Sneezing or nasal congestion after a particular exposure - Environmental allergens can trigger allergic rhinitis.
Itchy or watery eyes - Ocular allergy commonly accompanies pollen or animal-allergen exposure.
Hives following a suspected allergen - Urticaria can occur during an IgE-mediated reaction.
Lip or facial swelling - Angioedema may accompany allergic reactions.
Itching or tingling in the mouth after a particular food - Oral symptoms can occur with food allergy or pollen-food syndrome.
Vomiting or gastrointestinal symptoms soon after eating a suspected food - These may form part of an immediate allergic reaction.
Wheezing after exposure to a suspected trigger - Allergens can exacerbate asthma in sensitised individuals.
Repeated symptoms in a specific season or environment - A consistent exposure pattern makes targeted testing more informative.
Throat tightness, difficulty breathing, collapse or rapidly progressive swelling can represent anaphylaxis and requires emergency treatment.
Do not deliberately expose yourself to a food or other allergen that has previously caused a significant reaction simply to see whether symptoms recur.
How to Book Your Individual Allergen Test
The Individual Allergen test allows one suspected trigger to be selected for targeted specific-IgE analysis.
Choose the Individual Allergen
Select the individual allergen blood test and identify the specific allergen you want measured.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy according to availability.
Attend your appointment
A trained healthcare professional collects the required venous blood specimen.
Laboratory analysis
Your serum is analysed for specific IgE antibodies directed against the selected allergen.
Receive your results securely
Your authorised allergy result is delivered securely and can be interpreted alongside your reaction and exposure history.
When Will I Receive My Results?
The current expected turnaround for the Individual Allergen test is approximately 1 day after your sample reaches the laboratory.
Specific-IgE testing is routinely performed within specialist allergy laboratories.
The sample undergoes analysis, laboratory quality control and result authorisation before reporting.
Turnaround starts from laboratory receipt rather than necessarily from the exact time of blood collection.
Certain uncommon allergens or additional specialist component testing may have different turnaround times if ordered separately.
Understanding Your Results
A result below the laboratory detection or reporting threshold means significant specific IgE sensitisation to the selected allergen was not identified.
This reduces the likelihood of an IgE-mediated reaction to that allergen but does not completely exclude allergy.
A positive result demonstrates sensitisation.
The higher the specific-IgE concentration, the more likely the sensitisation may be clinically relevant in some settings, but there is substantial overlap.
The result cannot reliably predict the severity of a future reaction.
A positive result in someone who has never developed symptoms on exposure may have limited clinical importance.
Conversely, a consistent clinical reaction deserves appropriate assessment even when a blood result is negative.
The most useful interpretation therefore combines the laboratory value with exposure history and, where necessary, allergy-specialist review.
Why Book With London Blood Tests?
London Blood Tests provides targeted private allergy testing when one particular trigger is suspected.
Focused allergen testing - Tests one selected allergen rather than automatically screening hundreds of unrelated substances.
Measures specific IgE - Provides more targeted information than total Immunoglobulin E alone.
No allergen exposure required - The test does not require you to eat or deliberately contact the suspected trigger.
Suitable while taking antihistamines - Antihistamines generally do not prevent laboratory measurement of serum specific IgE.
Useful for food and environmental allergens - A wide range of individual allergens can be selected.
Private blood testing in London - Professional clinic and mobile phlebotomy options are available.
Fast results - Current turnaround is approximately 1 day.
Clear pricing - The Individual Allergen test costs £55.
Private Individual Allergen Blood Test in London
London Blood Tests provides private Individual Allergen blood testing for people seeking targeted investigation of one suspected allergic trigger.
The test costs £55 and measures 1 biomarker: Allergy - Individual Allergens.
Results are expected approximately 1 day after laboratory receipt.
A positive result confirms sensitisation rather than automatically proving clinical allergy, so the result should be interpreted with the person's actual reaction history.