Nut component testing is being used more and more these days to better identify nut allergies. In previous posts we have spoken about peanut component testing and hazelnut component testing.
The FDA recently approved nut component testing for the following nuts, Walnut, Cashew and Brazil Nut Allergen components. The tests are performed in the Phadia laboratory system.
Allergen nut component testing, in conjunction with whole allergen test results help you better diagnose allergy, allowing you to prepare a more comprehensive management plan.
Walnut Component Testing
Walnut is one of the most common causes of allergic reactions to tree nuts. The estimated prevalence of walnut allergy in the general population is 0.7%. Walnut allergy is potentially life-threatening, increasing in prevalence and rarely outgrown. The walnut allergen components tested for are Jug r 1 and Jug r 3. Jug r 1 is a storage protein, heat and digestion stable, highly abundant in walnut, it is associated with systemic reactions. Jug r 3 is associated with local as well as systemic reactions. If you are allergic to either component, walnuts should be avoided. If you are allergic to the whole walnut allergen but not to any component, speak to your allergy doctor about further testing.
Cashew Component Testing
Cashew nut sensitized patients have a risk of experiencing severe allergic reactions; the risk has been reported to be even higher than for peanut allergic patients. Cashew nut allergy is increasing as consumption increases-snacking on cashew nuts has become more popular, and their use as a common ingredient in Asian foods, baked goods, nut butters and pestos is growing. Cashew nut allergy is potentially life-threatening, can start early in life and is rarely outgrown. The component that is tested is Ana o 3, it is a storage protein, highly abundant in cashew nut and associated with systemic reactions. If the cashew nut test is positive, and the component nut testing for cashew (Ana o 3) is negative, speak to your allergist about further testing.
Brazil Nut Component Testing
Brazil nut component testing is Ber e 1. It is a storage protein, heat and digestion stable, highly abundant in brazil nut and associated with systemic reactions. A positive test to this is highly reflective of a true Brazil Nut allergy.
As always speak to your allergist regarding your food allergies. The component nut testing can better elucidate true allergies to these nuts.
To learn more about component testing to other foods such as Milk and Eggs, please click below.