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The Brazil nut IgE test is a vital diagnostic tool for detecting IgE antibodies in individuals suspected of having a Brazil nut allergy. This test is essential for confirming sensitization to Brazil nut allergens, which can lead to severe allergic reactions, including anaphylaxis. The procedure involves collecting a serum sample, typically using a serum gel or red-top tube, and analyzing it through Fluorescent Enzyme Immunoassay (FEIA) to detect specific IgE antibodies. If the initial test indicates a significant IgE level, a reflex test for the Brazil nut allergen component Ber e 1 is conducted. Results are categorized based on IgE concentration, with levels above 0.70 kU/L considered positive. Clinical correlation with patient history is crucial, as positive results suggest sensitization, while negative results do not entirely rule out allergic responses. The test is particularly useful for patients with suspected tree nut allergies, offering a turnaround time of 3 to 4 days.

Price of test:£34

The lowest price from the last 30 days: £34

Awaiting result:

One day

Collect material:

Blood

Prepare:

Learn more

Purpose of the test

The Brazil nut IgE test is essential for diagnosing Brazil nut allergies by detecting IgE antibodies in serum. It involves:

- Collecting a serum sample in a serum gel or red-top tube.
- Centrifuging and aliquoting the serum into a plastic vial.
- Using Fluorescent Enzyme Immunoassay (FEIA) to identify specific IgE antibodies.

Results are classified as:

- Negative: <0.10 kU/L
- Positive: ≥0.70 kU/L

Clinical correlation with patient history is crucial. The test's reflexive nature aids in assessing allergenic response strength, with a typical turnaround time of 3-4 days.

Who Should Get Tested

The Brazil nut IgE test is essential for diagnosing Brazil nut allergies, particularly in individuals with suspected tree nut allergies. This test identifies IgE antibodies in the serum, confirming sensitization to Brazil nut allergens, which can cause severe reactions like anaphylaxis. Key steps include:

- Sample Collection: Serum is collected and prepared.
- Immunoassay: IgE reacts with allergens.
- Enzyme Labeling: Forms a detectable complex.
- Result Interpretation: IgE levels indicate allergy severity.

Results guide clinical decisions, considering patient history and symptoms, ensuring accurate allergy management.

Blood Test Preparation Guidelines

Time of day

It is recommended to schedule your appointment for blood tests in the morning hours between 7:00-10:00.

Fasting

It is recommended to fast for approximately 12 hours before blood sampling. The last meal of the previous day should ideally be consumed around 6:00 p.m. On the day before the test, avoid heavy and fatty meals as well as alcohol.

Stay hydrated

Drinking water prior to testing can help with sample collection.

Other factors

Tests should not be performed after a sleepless night or intense physical activity. It is recommended to avoid exercise and stress immediately before blood collection and to not smoke. A short rest is recommended.

Medications and supplements:

Blood samples should be collected before the morning dose. Some drugs can interfere with test results. Consult with your doctor whether you can delay your dose because of lab tests.

Biotin supplements:

High doses of biotin supplements can affect test results, causing false elevation or reduction. It's recommended to avoid taking biotin for at least 72 hours before blood collection. If you are taking biotin, inform the personnel collecting the blood so that they can provide specific instructions.

Interpreting Test Results

Understanding test results is crucial for managing Brazil nut allergies. Here's a concise guide:

- Negative: <0.10 kU/L
- Borderline/Equivocal: 0.10-0.34 kU/L
- Equivocal: 0.35-0.69 kU/L
- Positive: 0.70-3.49 kU/L
- Positive: 3.50-17.4 kU/L
- Strongly Positive: 17.5-49.9 kU/L
- Strongly Positive: 50.0-99.9 kU/L
- Strongly Positive: ≥100 kU/L

Results ≥0.70 kU/L suggest a significant allergy. Clinical correlation with patient history is essential for accurate diagnosis and management.

Price of test:£34

The lowest price from the last 30 days: £34

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