Is it necessary to test both english walnut and black walnut when evaluating for a walnut allergy?
Both are often on food panels but there is cross reactivity so shouldnt 1 suffice? How do you interpret 1 that is sufficiently positive at 10 mm but the other is 0 mm as well as pecan?
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Do you test both english walnut and black walnut when evaluating for a walnut food allergy?
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2 Answers
Mednet MemberInvited Expert
Allergy & Immunology · University of Rochester Medical Center
Answered on
English walnuts are the standard grocery store walnut, and are great for everyday baking and snacks. Compared to Black walnut, they are mild, sweet, and buttery. Black walnuts are used in some specialty desserts, but are less commonly used. The two walnuts are greatly cross-reactive, so testing for ...
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Mednet MemberInvited Expert
Allergy & Immunology · Scripps Clinic Carmel Valley
Answered on
Studies show high, near-complete cross-reactivity between English walnuts (Juglans regia) and black walnuts (Juglans nigra), with very similar allergenic proteins (like Jug r 1, a 2S albumin) causing reactions in patients sensitive to either.
The patient in question must be reacting to a unique prot...
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