Allergic Skin Rash Testing
View All TestsWhat Causes Allergic Skin Rashes?
Allergic skin rashes can take many forms, including hives (urticaria), eczema flares, and contact dermatitis. They occur when the immune system reacts to a substance the body perceives as harmful, releasing chemicals such as histamine that cause inflammation in the skin.
Common triggers for allergic skin reactions include foods, environmental allergens (dust mites, pet dander, pollen), medications, insect stings, and contact substances such as nickel and latex. In some cases, the trigger may not be immediately obvious.
Allergy blood testing can help identify whether IgE-mediated sensitisation to specific allergens is present, offering a useful starting point for understanding your skin reactions. Results should be shared with your GP or dermatologist for clinical interpretation.
How Testing Works
Choose Your Test
Select from our range of allergy blood tests and book a convenient time at our South Kensington clinic. No GP referral needed.
Nurse Blood Draw
A qualified nurse takes a small blood sample at our clinic. The appointment is quick and straightforward.
Get Your Results
Results are sent directly to you, typically within a few working days. Share them with your GP or specialist to guide your next steps.
Recommended Tests for Skin Rash Investigation
ALEX² Allergy Test (Venous)
Allergy Profile 1 (Food & Inhalants)
Atopic Dermatitis/Eczema Profile (14 allergens)
Eosinophil Cationic Protein
Latex Components
Nickel (Serum)
Total IgE
Why Choose a Diagnostic-Only Clinic?
Unlike clinics that provide both testing and treatment, our nurse-led service focuses solely on accurate diagnostic testing. Because we don't offer treatments or prescriptions, there is no commercial incentive to recommend unnecessary tests — just honest, impartial results you can trust.
Nurse-Led & Impartial
Our qualified nurses collect your sample — we don't prescribe, treat, or have any reason to upsell.
Results You Own
Your results are sent directly to you. Take them to your GP or a specialist to discuss what's best for your situation.
You Stay in Control
Understand your allergy profile, then decide with your healthcare professional what steps to take next.
Related Reading
Frequently Asked Questions
Can a blood test tell me what is causing my skin rash?
A specific IgE blood test can identify whether you are sensitised to particular allergens. However, not all skin rashes are allergic in origin. Your GP or dermatologist can help correlate test results with your clinical picture.
Which test is best for investigating an allergic rash?
The ALEX² test provides our broadest panel, screening for over 300 allergens. The Atopic Dermatitis/Eczema Profile targets allergens most commonly associated with skin conditions. Your choice may depend on the pattern and timing of your symptoms.
Do I need a GP referral for allergy testing?
No. You can book directly with our clinic without a GP referral. Simply choose your test and select a convenient appointment time. If you're unsure which test is right for your symptoms, our team can help guide your selection.
Do I need to stop taking antihistamines before a blood test?
No. Unlike skin prick testing, IgE blood tests are not affected by antihistamines or other allergy medications. You can continue taking your regular medications before your appointment.
What should I do with my results?
As a diagnostic-only clinic, we provide results directly to you. We recommend sharing them with your GP or dermatologist for interpretation and to discuss whether further investigations may be appropriate.
Investigate Your Skin Rash Triggers
Book a blood test at our South Kensington clinic
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