Skip to main content

Home kit

Allergy Test (ALEX3)

A single blood sample tested against around 300 allergens at once, covering foods, pollens, animals, moulds, insect venoms and latex.

  • Doctor-reviewed results
  • Laboratory analysis
  • 3 to 5 working days from lab receipt
  • No fasting required
Allergy Test (ALEX3), home test kit

What’s included

300 allergens + total IgE

  • Allergen-specific IgE array (ALEX3)

    Measures IgE antibodies in the blood to a wide panel of allergens, such as house dust mite, pollens and animal dander. IgE levels do not always match how strongly someone reacts, so results are read alongside symptoms and history.

Which allergens does it cover?

ALEX3 measures specific IgE antibodies against 300 allergen extracts and components, plus total IgE. The 300 measurements include different proteins from the same source: they do not represent 300 different foods or 300 diagnosed allergies.

PrivateTests panel assistant

Is your allergen included?

Ask a coverage question or search a food, animal, pollen or component. For example: “Does it include peanut?”

Answers use our verified 300-entry list, not an AI diagnosis or live clinician. Questions stay in this page’s memory; this tool does not send or save them.

Ask a question to check coverage.

Examples from the panel, grouped to make them easier to find. This is not the complete allergen list.

Milk & egg
Cow's, goat's and sheep's milk; egg white and yolk.
Nuts & seeds
Peanut, cashew, hazelnut, walnut, almond and sesame.
Grains & legumes
Wheat, rye, oat, soy, lentil and pea.
Fruit & vegetables
Apple, peach, kiwi, celery and tomato.
Fish & shellfish
Cod, salmon, prawn, crab and lobster.
Meat
Beef, pork and chicken, plus the alpha-gal component.
Grass, tree & weed pollens
Timothy grass, birch, olive, mugwort and ragweed.
Pets & other animals
Cat, dog, horse, rabbit and guinea pig.
Mites & moulds
House dust mites; Alternaria and Aspergillus moulds.
Insects, venoms & latex
Honeybee, wasp, cockroach and natural rubber latex.
View our complete ALEX3 allergen guide (PDF, opens in a new tab)

PrivateTests guide, checked against the panel specification on 7 September 2026. Looking for a specific allergen? Check the full guide before ordering.

Overview

ALEX3 is a broad blood test for IgE sensitisation across food and environmental allergens. It may help when a clinician is investigating several possible triggers. Its value is in interpreting the pattern alongside your symptoms and history, not in treating every positive result as an allergy. If you suspect one particular trigger, ask whether a targeted test would be more appropriate.

One small blood sample, taken with a finger-prick kit at home or by a nurse at a clinic, is tested against 300 allergens in a single run: 82 whole allergen extracts and 218 individual allergen proteins. It reports specific IgE antibodies, which show sensitisation. Sensitisation is not the same as an allergy: many people have antibodies to a food they eat without any problem. A doctor reads your results alongside your symptoms and history, and explains which ones are likely to matter and which are unlikely to explain what is happening to you.

Who this is for and who it isn’t

Who it’s for

  • Adults aged 18 and over
  • People with reactions to particular foods, or seasonal symptoms, who want a broad look before an allergy assessment
  • People preparing for an allergy clinic appointment

Who it isn’t for

  • This is not a food-intolerance test or a test for every type of allergy. A positive IgE result is not on its own an allergy diagnosis or a prediction of reaction severity. Do not remove foods you tolerate solely because of a result.
  • Previous severe reactions need specialist assessment; current breathing difficulty or sudden throat swelling needs emergency help, not a home test.
  • Anyone with a new, severe or worsening symptom: contact your GP or call NHS 111. A test you buy today is not a substitute for being examined.

Common reasons people choose this test

  • A clinician is investigating more than one possible allergy trigger
  • Reactions associated with particular foods or environments
  • Seasonal symptoms for which allergy testing has been advised
  • Preparing for an allergy assessment with your clinician

These are reasons people choose to test, not signs that something is wrong. A result is one part of a picture your doctor puts together with your history and an examination.

What your result looks like

Individual specific IgE results

Results for the allergens on the panel, not a single allergy score. Components are particular proteins within an allergen source.

Total IgE

An additional measurement of overall IgE. It does not identify a particular trigger on its own.

Doctor-reviewed interpretation

Your results are reviewed alongside your reported symptoms and history, with advice on appropriate next steps. Further allergy assessment may be needed.

This describes the report contents; it is not an example of your results or a diagnosis.

How it works

  1. Your kit arrivesPosted to your door, with instructions and what you need to send your sample back.
  2. You take your sampleFinger-prick sample at home, or a clinic blood draw, your choice
  3. The laboratory analyses itYour sample is processed for the measurements included in this test. Lab processing typically takes 3 to 5 working days from receipt of your sample.
  4. A doctor reviews and releases itA GMC-registered doctor reads every result and signs the report before it reaches you.
Sample
Home finger-prick kit
Preparation
No fasting required
Who it's for
Any sex · ages 18+

How to prepare

What we can and can’t tell you

The reference range beside each result is the laboratory’s own. A result in range is not a clean bill of health and a result outside it is not a diagnosis. Most ranges cover about 95% of healthy people, so about 1 in 20 healthy people fall just outside any one range. No test result replaces an examination or your own doctor’s judgement, and none of these panels is a cancer screening programme.

Read the full note

ALEX3 measures IgE sensitisation, which is not the same as having symptoms from an allergy. It cannot assess every cause of a reaction or predict how severe a future reaction will be, and it is not a food-intolerance test. A negative result does not explain away persistent symptoms.

Decisions about avoiding foods or changing treatment need clinical advice.

Frequently asked questions

Which allergens are included?

The panel covers food and environmental allergens, including milk, egg, nuts, grains, legumes, fruit, vegetables, seafood, meat, pollens, animals, mites, moulds, insects, venoms and latex. You can see examples in the coverage section above, with a link to our full allergen guide.

Does 300 allergens mean 300 different foods?

No. The panel contains 82 allergen extracts and 218 molecular components. Several components can come from the same food, plant or animal. Total IgE is reported in addition to these 300 measurements.

What does a positive result mean?

It shows IgE sensitisation to the measured allergen. This may or may not explain your symptoms. The result needs clinical interpretation; do not stop eating foods you tolerate based on a positive result alone.

Is this a food-intolerance test?

No. This tests IgE sensitisation, not food intolerance such as lactose intolerance. Some allergic reactions also involve mechanisms other than IgE and need a different assessment.

Should I choose ALEX3 or a targeted allergy test?

ALEX3 measures many allergens together. A targeted test may be more appropriate when your history points to a particular trigger. Ask your GP or allergy clinician which approach would help answer your specific question.

Do I have to stop antihistamines first?

No. That is one of the advantages of a blood test over skin-prick testing. Antihistamines block the skin reaction that a skin test depends on, but they do not change the antibody level in your blood, so you can carry on with your usual medicines.

Can children have it?

Not through us. Our tests are for adults from 18. Allergy in children is assessed through a GP and, where needed, an NHS paediatric allergy service, because the interpretation and the next steps are different at that age.

How is the sample taken?

Either a finger-prick sample using the kit we post you, or a nurse-taken sample at a clinic if you prefer. The laboratory needs a small amount of serum either way.

How long do results take?

The laboratory typically takes 3 to 5 working days from receiving your sample. This does not include kit delivery, sample collection or return postage. A doctor reviews your results before they are released.

Can I choose a home kit or a clinic?

Both, it is your choice at checkout. Either collect a finger-prick sample at home with the posted kit and send it back as the instructions explain, or book a clinic appointment and have a trained clinician take the sample for you.

Is a doctor involved?

Yes. Every result is reviewed by a GMC-registered doctor who signs it off and explains what it means and what to do next.

Is it confidential?

Your results are available through your secure patient portal. Our privacy policy explains how your information is handled and when it may be shared to provide your care.

What happens to my sample and results?

Your sample is analysed at a UKAS-accredited laboratory (ISO 15189). A GMC-registered doctor then reads every result and signs the report before it is released to your secure portal, so nothing reaches you unreviewed. The report lists your specific IgE result for each allergen on the panel, plus your total IgE, with the laboratory's own units and reporting criteria. The doctor's note explains which results may be relevant to your symptoms and what usually happens next, which may be a conversation with your GP or an allergy clinic. A blood test does not replace an allergy assessment with a clinician, which can include a food challenge: eating small, increasing amounts of a food under medical supervision.

Doctor-reviewed results
In plain English, signed by a GMC-registered doctor
Laboratory testing
Read each test’s coverage and limitations
No GP referral
Order directly, no waiting list
Private & discreet
Secure results, your own private portal

Cookies on privatetests

We only use the cookies this shop needs to work, like your basket and sign-in. No analytics, advertising or session-recording cookies. Cookie policy