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Choosing between the various allergy blood tests on offer in the UK is genuinely confusing, here's the science you need — what each test actually measures, how to choose between the options, the role of total IgE, and how to actually understand the report.

Immunoglobulin E (IgE) is the allergy antibody. Two types of IgE testing are commonly used: Total Serum IgE — total circulating IgE — is a useful screening number; Specific IgE measures IgE bound to specific allergens such as cat dander, peanut or birch pollen. Specific IgE answers "what am I allergic to?" — Total IgE flags allergic phenotype without identifying triggers.

ALEX3 ( https://drderme.com/treatment/tear-trough-filler/ ) is a multiplex specific-IgE panel testing IgE against ~295 allergens in a single sample. It's especially valuable when several allergens are suspected, cross-reactivity is likely, symptoms span multiple categories, or skin prick testing is contraindicated.

Specific IgE results are reported in kU/L plus a 0–6 class score — Class 0 means no detectable IgE, Class 1 low-level, Class 2 moderate-level, Class 3 high-level, and Class 4–6 very-high level.

A positive IgE on its own does not equal a clinical allergy — symptoms matter. You can be IgE-positive to peanut but eat peanuts uneventfully. That's why interpretation matters.

https://drderme.com/our-clinics/birmingham-botox-fillers-clinic/ in several ways: it covers far more allergens — ~295 vs 10–40; skin prick can't be read on antihistamines, ALEX3 can; active eczema doesn't disqualify ALEX3 like it does skin prick; cross-reactivity components are an ALEX3 strength.

Choosing the right test depends on history and symptoms. Dr Derme's doctor-led pathway provides consult, sample, results and interpretation in one bundle. Book an allergy blood test at https://drderme.com/tests/comprehensive-alex3-food-environmental-allergy-testing/.