From hay fever to food intolerances and skin rashes, allergies affect millions of people across the UK. In fact, according to Allergy UK, over 20% of the population suffers from one or more allergic conditions. Yet, many people continue to live with unexplained symptoms because they don’t know what’s triggering them.
This is where professional allergy testing comes in.
By identifying your specific allergens through medically approved tests, you can receive targeted treatment, reduce flare-ups, and enjoy a better quality of life. In this guide, we’ll walk you through exactly what allergy testing involves, what to expect, and how it can make a real difference to your health.
What Is Allergy Testing?
The Purpose of Allergy Tests
Doctors use allergy testing to determine whether your immune system reacts to certain substances (allergens). These reactions can range from mild itching to severe respiratory or digestive symptoms.
The primary goals of allergy testing are:
- To pinpoint specific allergens causing your symptoms
- To inform a personalised treatment plan
- To help prevent more serious reactions in the future
Who Should Get Allergy Tested?
You should consider allergy testing if you experience:
- Repeated sneezing, itchy eyes, or nasal congestion
- Eczema, hives, or other skin irritations
- Digestive issues after eating certain foods
- Unexplained fatigue or headaches
- Asthma that worsens during specific seasons or environments
Children, adults, and elderly individuals can all safely undergo allergy testing under clinical supervision.
Types of Allergy Tests Available
There’s no one-size-fits-all when it comes to allergy testing. The right method depends on your symptoms, history, and suspected triggers.
Skin Prick Test (SPT)
How it works:
A small amount of a suspected allergen is placed on the skin, usually the forearm or back. A sterile needle is used to gently prick the skin beneath the substance.
What it detects:
- Pollen (hay fever)
- Animal dander
- Mould
- Dust mites
- Foods
- Insect venom
Pros:
- Fast results (within 20 minutes)
- Minimally invasive
Limitations:
- Not ideal if you’re taking antihistamines
- Risk of mild swelling or irritation
Blood (IgE) Testing
How it works:
A small sample of blood is tested in a lab for immunoglobulin E (IgE) antibodies, which indicate an allergic response.
When it’s used:
- If skin testing isn’t suitable (e.g., eczema, dermatographism)
- When you’re unable to stop antihistamines
- For small children
Pros:
- No skin reaction
- Can test for multiple allergens at once
Limitations:
- Results take longer (a few days)
- Slightly less sensitive than skin prick tests for some allergens
Patch Testing
Used for:
Diagnosing delayed allergic reactions, such as those seen in contact dermatitis.
How it works:
Allergens are applied to patches, which are placed on the back and left for 48 hours.
Best for:
- Nickel allergy
- Cosmetic product sensitivities
- Latex
- Detergents
Oral Food Challenge / Elimination Diet
Gold-standard for food allergies.
- Patients consume small amounts of the suspected food under medical supervision.
- Any reactions are carefully monitored.
- Often preceded by an elimination diet, where specific foods are removed, then reintroduced.
What to Expect During Your Allergy Testing Appointment
Initial Consultation and Medical History
Before any testing, your allergist will:
- Take a full medical history, including symptoms, triggers, family history, and current medications
- Discuss lifestyle and diet
- Explain which test(s) are most appropriate
This consultation helps ensure that the testing is safe and effective.
The Testing Process Step-by-Step
Depending on the type of test:
- Skin tests are performed in-clinic and typically take less than an hour
- Blood tests require a simple blood draw; results are available within a few days
- Patch tests involve wearing the patches for 48–72 hours
- Food challenges may take place over several hours with close observation
You’ll usually be asked to stop taking antihistamines 48–72 hours prior.
Safety and Side Effects
- Mild itching, redness, or swelling at the test site is common
- Rarely, some patients may experience a stronger allergic reaction—clinics are fully equipped to manage this
- Always follow your allergist’s preparation and aftercare advice
How Allergy Testing Helps Improve Your Health
Targeted Treatment Options
Once the allergens are identified, your doctor can tailor treatment that may include:
- Antihistamines or corticosteroid sprays
- Desensitisation therapy (immunotherapy) for long-term control
- Lifestyle adjustments (e.g., avoiding dust mites or specific foods)
Preventing Severe Reactions
Timely testing can prevent serious complications such as:
- Anaphylaxis
- Chronic asthma flare-ups
- Severe skin conditions
Better Quality of Life
Knowing your triggers empowers you to:
- Avoid allergic episodes
- Sleep better
- Breathe more freely
- Reduce time off work or school
- Regain energy and focus
Choosing the Right Clinic for Allergy Testing
What to Look for in a Private Allergy Clinic
- GMC-registered consultants or immunologists
- Full range of allergy testing services
- Rapid appointment availability
- Clear pricing and aftercare plans
- CQC (Care Quality Commission)-registered facilities
Questions to Ask Before Booking
- “Which allergy tests do you offer?”
- “Do I need a GP referral?”
- “Will I get a personalised treatment plan?”
- “Are follow-up consultations included?”
FAQs About Allergy Testing
Q: How long does allergy testing take?
SPTs take around 30–45 minutes. Blood tests are quicker, but results may take a few days.
Q: Does allergy testing hurt?
Most patients describe the sensation as a light prick or tickle. It’s not painful.
Q: Can children be tested?
Yes. Allergy testing is safe for children, especially those with asthma, eczema, or food sensitivities.
Q: Will insurance cover the testing?
Some private medical insurers cover allergy testing. Check your policy or speak to your provider.
Conclusion
Allergy testing is a vital step toward finding long-term relief from bothersome or even dangerous symptoms. Whether you’re struggling with seasonal allergies, food reactions, or skin issues, identifying the cause is the first step toward personalised, effective treatment. Don’t let allergies limit your quality of life. Book your allergy testing in London today and start your journey toward clearer breathing, healthier skin, and symptom-free living.
