{"id":"ige-cor-a-14","name":"Cor a 14 (hazelnut) IgE","shortName":"Cor a 14 IgE","aliases":["Cor a 14 IgE","rCor a 14","f439","Cor a 14 (hazelnut) IgE","Hazelnut Cor a 14 IgE","rCor a 14 IgE","f439 IgE","Cor a 14 (f439) IgE","Cor a 14 (F439)","Hazelnut (rCor a 14) IgE"],"abbreviations":["Cor a 14","f439","rCor a 14"],"loinc":[{"code":"81788-2","primary":true}],"specimen":"serum","units":[{"ucum":"kU/L","display":"kU/L"},{"ucum":"U/mL","display":"UA/mL"}],"referenceRanges":[{"population":"Adults","low":0,"high":0.1,"unit":"kU/L","unitDisplay":"kU/L","note":"Labcorp prints results under 0.10 kU/L as class 0 (negative), and its hazelnut component sample report shows Cor a 14 results in kU/L with the same class table as whole allergens. 0.10 is also the lowest value the ImmunoCAP assay reports. Thermo Fisher, which makes the assay, treats results of 0.1 kUA/L or more as detected sensitization. Labcorp flags results from 0.10 kU/L upward and calls 0.10 to 0.31 class 0/I (equivocal or low). The older cutoff of 0.35 kU/L is still used in many studies, including the pooled Cor a 14 analysis in children (Caffarelli 2021). Labs print results below the limit as '<0.10', and a printed 0.10 is already class 0/1. A result above the range shows sensitization, not that you have an allergy (NIAID 2010, WAO 2020). The numbers on a Cor a 14 result are not a prediction of how severe a reaction would be. One Dutch study (Masthoff 2013) found that IgE to Cor a 9 of 1 kUA/L or higher or to Cor a 14 of 5 kUA/L or higher in children (or Cor a 14 of 1 kUA/L or higher in adults) had specificity above 90% for hazelnut allergy with symptoms on challenge, but those cutoffs came from one population and one assay and aren't general.","sources":[{"title":"Allergen Profile, Hazelnut, IgE With Component Reflexes (test 604734)","url":"https://www.labcorp.com/tests/604734/allergen-profile-hazelnut-ige-with-component-reflexes","publisher":"Labcorp"},{"title":"Sample patient report: Allergen Profile, Hazelnut, IgE With Component Reflexes (test 604734)","url":"https://files.labcorp.com/testmenu-d8/sample_reports/604734.pdf","publisher":"Labcorp","year":2019},{"title":"ImmunoCAP Specific IgE blood test results: Interpretation (respiratory results interpretation guide)","url":"https://corporate.thermofisher.com/content/dam/phadia/library/en/Respiratory%20Results%20Interpretation%20Guide.pdf","publisher":"Thermo Fisher Scientific (Phadia)","year":2023},{"title":"ImmunoCAP Seed, Legume and Nut Component Allergens (Thermo Fisher product page for component f425; states component results run from 0.1 to 100 kUA/L)","url":"https://www.thermofisher.com/order/catalog/product/14496801","publisher":"Thermo Fisher Scientific"},{"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":"NIAID / Journal of Allergy and Clinical Immunology","year":2010},{"title":"IgE allergy diagnostics and other relevant tests in allergy, a World Allergy Organization position paper","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC7044795/","publisher":"World Allergy Organization Journal","year":2020},{"title":"ImmunoCAP Specific IgE: Hazelnut allergy (testing algorithm)","url":"https://corporate.thermofisher.com/content/dam/phadia/library/en/immunocap-testing-algorithms/Immunocap-testing-algorithm-Hazelnut-EN.pdf","publisher":"Thermo Fisher Scientific (Phadia)","year":2026},{"title":"Component-Resolved Diagnosis of Hazelnut Allergy in Children","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC7920284/","publisher":"Nutrients","year":2021},{"title":"Sensitization to Cor a 9 and Cor a 14 is highly specific for a hazelnut allergy with objective symptoms in Dutch children and adults","url":"https://pubmed.ncbi.nlm.nih.gov/23582909/","publisher":"Journal of Allergy and Clinical Immunology","year":2013}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures IgE to Cor a 14, a hazelnut storage protein. It is more often found in people who react to eating hazelnut.","url":"https://bloodtesttracker.com/markers/ige-cor-a-14","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}