{"id":"ige-pecan","name":"Pecan Nut IgE","shortName":"Pecan IgE","aliases":["F201-IgE Pecan Nut","Pecan Nut IgE","Pecan Nut (f201) IgE","Pecan (f201) IgE","f201 IgE","Pecan-Food, IgE","Pecan-Food, IgE, Serum","Pecan Nut, IgE","Allergen, Food, Pecan IgE","Carya illinoinensis IgE","ImmunoCAP f201","IgE Pecan Nut","Pecan or Hickory Nut IgE"],"abbreviations":["f201"],"loinc":[{"code":"6208-3","primary":true},{"code":"112234-0","primary":false}],"specimen":"serum","units":[{"ucum":"kU/L","display":"kU/L"}],"referenceRanges":[{"population":"Adults","low":0,"high":0.09,"unit":"kU/L","unitDisplay":"kU/L","note":"Most labs print a result under 0.10 kU/L as negative (class 0). Mayo Clinic Laboratories lists 0.10 to 0.34 kU/L as borderline or equivocal and flags 0.70 and above, with the same values at all ages. ARUP Laboratories lists 0.34 kU/L or lower as its pecan reference interval and says 0.10 to 0.34 kU/L is for specialist use because its meaning is unclear. The ImmunoCAP maker suggests a 0.35 kUA/L cutoff and tells each lab to set its own range. A result above these lines means sensitization, which is not the same as an allergy. Pecan and walnut are close relatives, and in studies most people allergic to pecan were also allergic to walnut (Elizur 2018, Jeong 2025). Results from different labs or test brands are not directly comparable.","sources":[{"title":"Pecan-Food, IgE, Serum (test ID PEC)","url":"https://www.mayocliniclabs.com/test-catalog/overview/82880","publisher":"Mayo Clinic Laboratories"},{"title":"Allergens, Food, Tree Nuts Profile IgE (ARUP test 3017913)","url":"https://ltd.aruplab.com/Tests/Pub/3017913","publisher":"ARUP Laboratories"},{"title":"510(k) Decision Memorandum K173726: ImmunoCAP Specific IgE (ImmunoCAP Allergen f447, rAra h 6, Peanut)","url":"https://www.accessdata.fda.gov/cdrh_docs/reviews/K173726.pdf","publisher":"U.S. Food and Drug Administration","year":2018},{"title":"Guidelines for the diagnosis and management of food allergy in the United States: report of the NIAID-sponsored expert panel","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC4241964/","publisher":"Journal of Allergy and Clinical Immunology","year":2010},{"title":"NUT Co Reactivity - ACquiring Knowledge for Elimination Recommendations (NUT CRACKER) study","url":"https://pubmed.ncbi.nlm.nih.gov/29127694/","publisher":"Allergy","year":2018},{"title":"Update on Tree Nut and Seed Allergies: Prevalence, Clinical Characteristics, Diagnosis, and Management","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC12683745/","publisher":"Allergy, Asthma & Immunology Research","year":2025},{"title":"Allergy Blood Test","url":"https://medlineplus.gov/lab-tests/allergy-blood-test/","publisher":"MedlinePlus, National Library of Medicine"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures IgE antibodies to pecan nut in your blood. A detectable result means you are sensitized to pecan, which is not the same as an allergy.","url":"https://bloodtesttracker.com/markers/ige-pecan","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}