{"id":"ige-common-ragweed","name":"Common Ragweed (Short) IgE","shortName":"Short ragweed IgE","aliases":["Common Ragweed IgE","W001-IgE Common Ragweed","Common ragweed (w1) IgE","w1 IgE","W001-IgE Ragweed, Short","Ragweed, Short IgE","Short Ragweed IgE","Allergen, Weed, Common/Short Ragweed IgE","Common ragweed (short) (Ambrosia elatior) IgE","Ambrosia artemisiifolia IgE"],"abbreviations":["w1","W001"],"loinc":[{"code":"6085-5","primary":true},{"code":"112156-5","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 lists 0.34 kU/L or less as its reference interval for this test), 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. Ragweed IgE can rise after the pollen season (in one older US study, peaks fell between mid-September and mid-October, Henderson 1975), and cross-reaction with mugwort, sunflower and other daisy-family plants, or IgE to plant sugar groups, can make a ragweed result positive (Cheng 2025).","sources":[{"title":"ImmunoCAP Weed Pollen Allergens (Thermo Fisher product page; lists w1 common ragweed; measuring range 0.1 to 100 kUA/L)","url":"https://www.thermofisher.com/order/catalog/product/14424701","publisher":"Thermo Fisher Scientific"},{"title":"Allergens, Weed Profile (test 0055110)","url":"https://ltd.aruplab.com/Tests/Pub/0055110","publisher":"ARUP Laboratories"},{"title":"Allergens, Inhalants, Comprehensive Profile IgE (test 0055312)","url":"https://ltd.aruplab.com/Tests/Pub/0055312","publisher":"ARUP Laboratories"},{"title":"Allergen Profile With Component Reflexes, Respiratory, Area 2 (test 607111)","url":"https://www.labcorp.com/tests/607111/allergen-profile-with-component-reflexes-respiratory-area-2","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":"Global Ragweed Allergy: Molecular Allergens and Integrated Control Strategies","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC11911648/","publisher":"Journal of Asthma and Allergy","year":2025},{"title":"Maximal rise in IgE antibody following ragweed pollination season","url":"https://pubmed.ncbi.nlm.nih.gov/45925/","publisher":"Journal of Allergy and Clinical Immunology","year":1975},{"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 short ragweed pollen, a common cause of late-summer and fall hay fever.","url":"https://bloodtesttracker.com/markers/ige-common-ragweed","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}