Tree Nut Allergy Test London | Cashew, Walnut, Hazelnut
This guide groups the common tree nuts, explains peanut cross-reactivity context, and outlines component-resolved testing options. Our service is CQC-registered and diagnostic-only: we provide nurse-led venous sample collection and laboratory reporting, while diagnosis and treatment decisions remain with your GP or specialist.
Safety note
If severe breathing symptoms, throat swelling, collapse, or suspected anaphylaxis occur, call 999 immediately. Blood testing is not an emergency service and does not predict the severity of future reactions.
Tree nut group and component markers
| Tree nut | Example components | Context |
|---|---|---|
| Cashew | Ana o3 | Storage protein component used in cashew sensitisation assessment |
| Walnut | Jug r1, Jug r3 | Components relevant in walnut sensitisation patterns |
| Hazelnut | Cor a9, Cor a14, Cor a1 | Components can help distinguish severity-associated vs pollen-related patterns |
| Brazil nut | Ber e1 | Storage protein component for Brazil nut assessment |
| Almond | Whole-allergen IgE | Tested as part of broader nut profiles where appropriate |
| Pistachio | Related to cashew | Botanically related to cashew; cross-reactivity can occur |
Component markers are examples for context only and do not predict reaction severity. Interpretation should always be made by your GP or specialist.
Cross-reactivity with peanut
Peanut is a legume and botanically distinct from tree nuts, but some people are sensitised to both. Cross-reactivity between certain tree nuts and peanut can occur, though it is not universal.
Component-resolved testing can help your clinician understand whether reactions relate to shared protein families or separate sensitisations.
Allergy Profile 4
Nut-focused IgE screening profile for structured pathway assessment.
View Profile 4 →Nut Allergy Testing Hub
Overview of nut testing pathways and how component tests are used.
Explore nut testing →Individual tree nut component tests
Cashew Components
Component-level support for individual tree nut sensitisation assessment.
View test →Walnut Components
Component-level support for individual tree nut sensitisation assessment.
View test →Hazelnut Components
Component-level support for individual tree nut sensitisation assessment.
View test →Frequently asked questions
Which tree nuts are commonly tested?
Common tree nuts include cashew, walnut, hazelnut, almond, Brazil nut, pistachio, pecan, and macadamia. Tree nuts are a distinct group from peanut, which is a legume.
Is there cross-reactivity between tree nuts and peanut?
Cross-reactivity can occur between certain tree nuts and peanut in some people, although it is not universal. Component-resolved testing can help characterise individual sensitisation patterns.
Can a blood test alone diagnose tree nut allergy?
No. Specific IgE and component results are supportive markers and should be interpreted with your reaction history by your GP or specialist. Our clinic provides nurse-led sample collection and laboratory reporting only.
What should I do about severe reactions?
If severe breathing difficulty, throat swelling, collapse, or suspected anaphylaxis occurs, call 999 immediately. Blood testing is not an emergency service and does not predict the severity of future reactions.