{"id":"ige-codfish","name":"Codfish IgE","shortName":"Codfish IgE","aliases":["Codfish IgE","Cod IgE","F003-IgE Codfish","Codfish (f3) IgE","Cod (f3) IgE","Codfish, IgE","Allergen, Food, Codfish IgE","f3 IgE"],"abbreviations":["f3","F003"],"loinc":[{"code":"6082-2","primary":true},{"code":"112163-1","primary":false}],"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":"Quest, Labcorp and ARUP all print a result under 0.10 kU/L as class 0 (absent, negative or no significant level), and 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. Labs disagree about the 0.10 to 0.34 zone: Quest calls it a very low level, ARUP calls its clinical relevance undetermined, and Labcorp flags results from 0.10 kU/L upward, calling 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 US NHANES survey, and a few labs go further: Children's Minnesota reports anything under 0.35 kU/L as negative. 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), and results from different labs or assay systems may not be comparable. For food allergens, a positive result is only one piece of the picture: IgE to codfish often reflects the shared fish protein parvalbumin, so it can be positive for other fish too (Hansen 1997), and IgE cross-reactivity between fish does not always match what happens when you eat them (Dijkema 2022).","sources":[{"title":"ImmunoCAP Fish, Shellfish and Mollusk Allergens (Thermo Fisher product page; lists f3 codfish; measuring range 0.1 to 100 kUA/L)","url":"https://www.thermofisher.com/order/catalog/product/14446501","publisher":"Thermo Fisher Scientific"},{"title":"Allergens, Food, Fish Profile IgE (test 2007036)","url":"https://ltd.aruplab.com/Tests/Pub/2007036","publisher":"ARUP Laboratories"},{"title":"F003-IgE Codfish (test 602465)","url":"https://www.labcorp.com/tests/602465/codfish","publisher":"Labcorp"},{"title":"Sample patient report: Allergens with Component Reflex, Area 20 (test 607120)","url":"https://files.labcorp.com/testmenu-d8/sample_reports/607120.pdf","publisher":"Labcorp","year":2021},{"title":"ImmunoCAP Specific IgE Blood Test: Allergy Test List (interpretation table and test codes)","url":"https://www.questdiagnostics.com/content/dam/corporate/restricted/documents/hcp/about-our-tests/TL3930_Allergy%20Test%20list%202017.pdf","publisher":"Quest Diagnostics","year":2017},{"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":"Prevalence of allergic sensitization in the United States: results from the National Health and Nutrition Examination Survey (NHANES) 2005-2006","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC4119838/","publisher":"Journal of Allergy and Clinical Immunology","year":2014},{"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":"Fish Allergy: Fishing for Novel Diagnostic and Therapeutic Options","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC8818006/","publisher":"Clinical Reviews in Allergy & Immunology","year":2022},{"title":"Codfish allergy in adults: IgE cross-reactivity among fish species","url":"https://pubmed.ncbi.nlm.nih.gov/9048527/","publisher":"Annals of Allergy, Asthma & Immunology","year":1997},{"title":"Allergen IgE (laboratory test manual entry; class table and reporting rules)","url":"https://www.childrensmn.org/Manuals/Lab/chemistry/allergen-ige.pdf","publisher":"Children's Minnesota","year":2018}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Shows whether your immune system has made IgE antibodies to codfish. This is called sensitization and doesn't always mean a fish allergy.","url":"https://bloodtesttracker.com/markers/ige-codfish","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}