{"id":"ige-ana-o-3","name":"Ana o 3 (cashew) IgE","shortName":"Ana o 3 IgE","aliases":["Ana o 3 IgE","rAna o 3","f443","Cashew Component rAna o 3","Cashew Component rAna o 3, IgE","Allergen, Cashew Component, rAna o 3","Allergen, Food, Cashew Component rAna o 3, IgE","F443-IgE Ana o 3","ImmunoCAP f443","Cashew allergen component (2S Albumin)","Cashew nut recombinant (rAna o) 3 IgE"],"abbreviations":["f443","rAna o 3"],"loinc":[{"code":"82539-8","primary":true},{"code":"113002-0","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":"Mayo Clinic Laboratories prints under 0.10 kU/L (class 0) as its reference value, and ARUP prints 0.09 kU/L or lower; ARUP says 0.10 to 0.34 is for specialist use because its clinical meaning is unclear. Higher values are graded in classes (see Bands), but studies place the level that goes with a true cashew allergy at different points: one study of 61 children estimated a 95% probability of allergy at 2.0 kU/L (Lange 2017). Labcorp runs this test as a follow-up when the whole-cashew IgE is above 0.10 kU/L. Results from different labs or test brands are not directly comparable.","sources":[{"title":"Cashew Component rAna o 3 (test ID FCCA3)","url":"https://www.mayocliniclabs.com/test-catalog/overview/75556","publisher":"Mayo Clinic Laboratories"},{"title":"Allergen, Food, Cashew Component rAna o 3, IgE (ARUP test 3018561)","url":"https://ltd.aruplab.com/Tests/Pub/3018561","publisher":"ARUP Laboratories"},{"title":"Allergen Profile, Cashew Nut, IgE With Component Reflex (Labcorp test 604159)","url":"https://www.labcorp.com/tests/604159/allergen-profile-cashew-nut-ige-with-component-reflex","publisher":"Labcorp"},{"title":"Ana o 3-specific IgE is a good predictor for clinically relevant cashew allergy in children","url":"https://pubmed.ncbi.nlm.nih.gov/27644013/","publisher":"Allergy","year":2017},{"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":"Peanut, IgE with Reflex to Peanut Components, IgE, Serum (test ID PEANT)","url":"https://www.mayocliniclabs.com/test-catalog/overview/64756","publisher":"Mayo Clinic Laboratories"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures IgE to Ana o 3, a protein stored in cashew seeds. Higher levels are more common in people with true cashew allergy, including strong reactions.","url":"https://bloodtesttracker.com/markers/ige-ana-o-3","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}