{"id":"ige-walnut","name":"Walnut IgE","shortName":"Walnut IgE","aliases":["F256-IgE Walnut","f256","Walnut IgE","Walnut-Food, IgE, Serum","Allergen, Food, Walnut (Juglans spp.) IgE","Walnut (f256) IgE","f256 IgE","ImmunoCAP f256","Juglans regia IgE","English Walnut IgE","Persian Walnut IgE","Walnut Specific IgE"],"abbreviations":["f256"],"loinc":[{"code":"6273-7","primary":true}],"specimen":"serum","units":[{"ucum":"kU/L","display":"kU/L"}],"referenceRanges":[{"population":"Adults","low":0,"high":0.09,"unit":"kU/L","unitDisplay":"kU/L","note":"This test shows whether your blood has IgE to walnut. Mayo Clinic Laboratories, ARUP and the ImmunoCAP class system print a result under 0.10 kU/L as class 0 (negative), so the usual range here ends at 0.09 and a printed 0.10 counts as above it. Labs draw the line in different places. Mayo Clinic Laboratories lists 0.10 to 0.34 kU/L as borderline or equivocal and 0.35 to 0.69 as equivocal, and flags 0.70 kU/L and above as high; its reference values apply to all ages. ARUP lists 0.10 to 0.34 kU/L as clinical relevance undetermined and says those results are for specialist use. The ImmunoCAP maker recommends a 0.35 kUA/L cutoff and tells each lab to set its own range. A result above these lines shows sensitization, which is not the same as an allergy. Use the range printed on your own lab report.","sources":[{"title":"Walnut-Food, IgE, with Reflex to Walnut-Food Components, IgE, Serum (test ID BLWRF)","url":"https://www.testcatalog.org/show/BLWRF","publisher":"Mayo Clinic Laboratories (catalog mirrored at testcatalog.org)"},{"title":"Allergen, Food, Walnut (Juglans spp.) IgE (ARUP test 0055209)","url":"https://ltd.aruplab.com/Tests/Pub/0055209","publisher":"ARUP Laboratories"},{"title":"ImmunoCAP Specific IgE (allergen component f447) 510(k) decision memorandum K173726","url":"https://www.accessdata.fda.gov/cdrh_docs/reviews/K173726.pdf","publisher":"U.S. Food and Drug Administration"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures IgE antibodies to walnut. A raised result can reflect a true walnut allergy or a pollen-related pattern, and it does not confirm an allergy on its own.","url":"https://bloodtesttracker.com/markers/ige-walnut","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}