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Walnut Allergy Test in Guru Tegh Bahadur Nagar West, Mumbai

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  • Walnut Allergy Test

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About

blood sample
Sample

BLOOD

Gender
Gender

Both

users
Age group

7 years & above

A walnut allergy occurs when the body’s immunoglobulin E (IgE) antibodies react with the protein components in a walnut. That reaction releases a pro-inflammatory mediator (histamine) that causes the manifestation of clinical symptoms.

The severity of the allergic reaction differs between individuals. Some examples of mild symptoms include:

  • Itching sensation in the throat or mouth
  • Excessive sneezing
  • Diarrhoea
  • Conjunctivitis
  • Difficulty in swallowing food

While most affected individuals experience the symptoms listed above, clinical manifestations of a walnut allergy can sometimes be more severe. In such cases, patients suffer from dermatological conditions such as hives or eczema along with facial swelling and breathing difficulties.

In rare circumstances, a walnut allergy can induce anaphylactic shock. The condition can be fatal if the affected individual does not receive immediate medical attention. Symptoms of anaphylaxis include:

  • Unusual sweating or clammy skin
  • Nausea and vomiting
  • Blood pressure
  • Rapid pulse
  • Fainting or dizziness

People allergic to walnuts can also have other variants of nut allergies. Allergenic components in nuts share cross-species similarities, which can induce the same hypersensitive reactions. This phenomenon is called cross-reactivity.

Examples of nuts that have similar allergenic components as walnuts are:

  • Almonds
  • Pecans
  • Pistachios
  • Cashews
  • Hazelnuts

A walnut allergy test can diagnose allergic reactions to the protein components present in walnuts. Moreover, the nut allergy test can assess an individual’s potential response to other nut allergens.

The assessment involves in-vitro serum testing, where the patient’s specimen reacts with the associated walnut allergens to form a complex. Testers remove non-specific IgE antibodies and add a labelled enzyme (anti-IgE antibody). After another removal process, the complex incubates alongside a developing agent. Fluorescent light is passed through the complex to assess the IgE antibodies in the sample. A high fluorescence value indicates an increased IgE concentration. Anything equal to or above the value of 0.7 ku/L leads to the diagnosis of a walnut allergy.

A few factors can render a nut allergy test invalid. If an individual has received prior immunotherapy, it can reduce IgE concentrations temporarily and, thus, deliver false test results. Additionally, a person may not manifest medically significant symptoms but still have a measurable IgE concentration in their sample. In such circumstances, test results are interpreted in that specific clinical context. A walnut allergy test can also deliver false results if the patient specimen binds to non-specific antigens.

Allergic reactions often aggravate existing respiratory issues. Hence, anybody with a history of such problems must seek immediate medical advice when they experience allergic symptoms.

Apollo 24|7 offers a comprehensive walnut allergy test that can diagnose an allergic response to walnuts. Some other aspects that a nut allergy test can help with are:

  • Determining the severity of the allergic response.
  • Outlining necessary treatment options.

Additionally, allergen response observed in a walnut allergy test can help doctors determine an individual’s cross-reactive sensitivity. 
 

 Medically reviewed by Dr Jatin Ahuja, Infectious Diseases, Apollo Hospitals Indraprastha, South Delhi.

faqFrequently Asked Questions (FAQs)

Is a walnut allergy common?

Nut allergies fall under the broader category of food allergies. Children are commonly affected by this allergy, even more than adults. This implies that affected individuals often outgrow such hypersensitive responses as they progress from childhood to adulthood.

When do you need to consult a doctor in case of a suspected allergy?

A walnut allergy can vary in terms of severity. Mild symptoms can be suppressed with over-the-counter medications such as Allegra-D and do not necessarily need additional medical attention. However, individuals must seek immediate medical care when they experience the following: Breathing difficulties Dizziness An unusual drop in blood pressure Rapid pulse

What should you do to prepare for a nut allergy test?

There are no specific requirements for a nut allergy test. However, if an individual has received prior immunotherapy, they must inform the doctor. Additionally, any over-the-counter medication, such as Allegra or Benadryl, must be avoided for up to 7 days before the test.

Does an allergic reaction to walnuts indicate a predisposition towards other nut allergies?

Some allergenic components are shared or similar across different nuts. Consequently, an allergic response to walnuts may also indicate the presence of other nut allergies. Examples of nuts that share similar allergens include: Almonds Pecans Pistachios Cashews Hazelnuts Therefore, it is essential to supplement a walnut allergy test with additional assessments.

Are there any risks associated with a walnut allergy test?

There are no commonly associated risks with a walnut allergy test. However, in rare cases, the test site (from where the sample is collected) may become slightly swollen or feel itchy. This side-effect is known as wheals. If this condition persists for more than a week, it is necessary to consult a doctor.

What are some food items that usually contain walnut as an ingredient?

Walnuts are usually found in the following: Baked goods such as cookies or pastries Granola or cereal bars Candy  Frozen desserts or other sweet items such as pudding and ice cream  Trail mix Consequently, anyone diagnosed with a nut allergy must ensure that they check the listed ingredients when purchasing any packaged food items.

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The information mentioned above is meant for educational purposes only and should not be taken as a substitute to your Physician’s advice. It is highly recommended that the customer consults with a qualified healthcare professional to interpret test results