What is the Brazil Nut IgE Level Test?

The Brazil Nut IgE Level test measures allergen-specific immunoglobulin E (IgE) antibodies directed against proteins found in Brazil nuts. IgE antibodies are responsible for Type I (immediate) allergic reactions, which can range from mild symptoms to severe anaphylaxis.

When the immune system incorrectly identifies Brazil nut proteins as harmful, it produces IgE antibodies. On exposure, these antibodies trigger the release of histamine and other inflammatory mediators, leading to allergic symptoms.

This blood test provides objective evidence of sensitisation and is particularly useful when skin testing is unsuitable or inconclusive.

Why do I need a test for Brazil Nut IgE?

You may need this test if you experience symptoms after consuming Brazil nuts or foods that may contain nut traces. Tree nut allergies are among the most common causes of severe allergic reactions and often persist into adulthood.

Testing helps confirm sensitisation, assess allergy risk and guide dietary avoidance strategies. It is also useful for evaluating cross-reactivity with other tree nuts and monitoring allergy development over time.

Symptoms and scenarios where testing is recommended:

• Itching or swelling of lips, mouth or throat
• Hives or skin rash after nut exposure
• Abdominal pain, nausea or vomiting
• Wheezing or shortness of breath
• Anaphylaxis or severe allergic reaction
• Known or suspected tree nut allergy
• Family history of nut allergy
• Dietary planning and risk assessment

Benefits of the Brazil Nut IgE Test

·      Confirms IgE-mediated nut allergy
Identifies immune sensitisation to Brazil nut proteins.

·      Assesses risk of immediate allergic reactions
Supports evaluation of reaction severity.

·      Improves dietary safety
Helps guide accurate nut avoidance.

·      Useful when skin tests are unsuitable
Ideal for patients with eczema or medication interference.

·      Supports cross-reactivity assessment
Helps evaluate reactions to related tree nuts.

·      Non-invasive testing method
Requires only a blood sample.

·      Supports personalised allergy management
Helps guide clinical advice and emergency planning.

·      Useful for monitoring sensitisation over time
Tracks changes in IgE levels.

Step-by-Step: How Testing Works

Choose your preferred testing method

You can attend one of our UK partner clinics or arrange a home or hotel visit with a mobile phlebotomist.

Option 1 – In-Clinic Blood Draw

1. Select your nearest UK clinic and book an appointment.
2. A clinician or phlebotomist collects a venous blood sample.
3. The sample is analysed for Brazil nut–specific IgE.
4. Results are delivered securely online.

Option 2 – Home or Hotel Phlebotomy (+£60)

1. Book a UK-wide home or hotel visit at a convenient time.
2. A trained phlebotomist collects your blood sample on-site.
3. The sample is packaged and transported to the laboratory.
4. Results are uploaded digitally without the need to travel.

Access your report

You can download and share your results with your GP or allergy specialist.

Your Results Explained

Low Levels

Low or undetectable Brazil nut–specific IgE suggests a low likelihood of IgE-mediated allergy.
Clinical correlation is still important if symptoms persist.
Typical UK reference: <0.35 kUA/L.

Normal / Borderline Levels

Borderline results may indicate mild sensitisation.
Further assessment or repeat testing may be recommended.

High Levels

Elevated Brazil nut IgE levels indicate sensitisation and increased allergy risk.
Higher levels are often associated with more significant clinical reactions, though severity varies between individuals.