{"id":"ige-ara-h-8","name":"Ara h 8 (peanut) IgE","shortName":"Ara h 8 IgE","aliases":["Ara h 8 IgE","rAra h 8","f352","Peanut Component Ara h 8, IgE","Mild Peanut IgE Ara h 8","Peanut F352 IgE Ara h 8","F352-IgE Ara h 8","Mild Peanut Ara h 8","Peanut recombinant (rAra h) 8 IgE","ImmunoCAP f352","rAra h 8 PR-10"],"abbreviations":["f352","rAra h 8"],"loinc":[{"code":"63477-4","primary":true},{"code":"112864-4","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 and the UW Medicine test guide (ARUP performs the test) print under 0.10 kU/L as negative. Mayo lists 0.10 to 0.34 kU/L as borderline and flags 0.70 and above, and its reference values apply to all ages. Quest's online directory tells users to rely on the range printed on their lab report. The ImmunoCAP maker suggests a 0.35 kUA/L cutoff for allergen IgE, and studies of Ara h 8 have used 0.35 kUA/L as the line for sensitization (Asarnoj 2012). Ara h 8 IgE is a weaker predictor of true peanut allergy than Ara h 2 (Klemans 2015). Detectable IgE shows sensitization, not necessarily allergy (NIAID 2010), and results from different labs or test brands are not directly comparable.","sources":[{"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"},{"title":"Mild Peanut IgE Ara h 8 (lab code RPTAH8)","url":"https://menu.labmed.uw.edu/view/RPTAH8","publisher":"UW Medicine Laboratory Medicine & Pathology","year":2026},{"title":"Peanut Component Panel (Quest test code 91681)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/91681/?cc=MASTER","publisher":"Quest Diagnostics"},{"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":"Diagnostic accuracy of specific IgE to components in diagnosing peanut allergy: a systematic review","url":"https://pubmed.ncbi.nlm.nih.gov/25226880/","publisher":"Clinical & Experimental Allergy","year":2015},{"title":"Peanut component Ara h 8 sensitization and tolerance to peanut","url":"https://pubmed.ncbi.nlm.nih.gov/22738678/","publisher":"Journal of Allergy and Clinical Immunology","year":2012}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures IgE to Ara h 8, a peanut protein that looks like a birch pollen protein. It is generally linked to milder, mouth-area symptoms, though stronger reactions are not ruled out.","url":"https://bloodtesttracker.com/markers/ige-ara-h-8","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}