{"id":"ige-rough-pigweed","name":"Rough pigweed IgE","shortName":"Pigweed IgE","aliases":["Rough pigweed (w14) IgE","w14 IgE","Rough pigweed IgE","W014-IgE Pigweed, Common","Pigweed, Common IgE","Common pigweed IgE","Pigweed IgE","Redroot pigweed IgE","Allergen, Weed, Pigweed IgE","Allergen, Weed, Pigweed","Rough pigweed (Amaranthus retroflexus) w14","Amaranthus retroflexus IgE","ImmunoCAP w14"],"abbreviations":["w14","W014"],"loinc":[{"code":"7604-2","primary":true},{"code":"112243-1","primary":false}],"specimen":"serum","units":[{"ucum":"kU/L","display":"kU/L"},{"ucum":"U/mL","display":"UA/mL"}],"referenceRanges":[{"population":"Adults","low":0,"high":0.09,"unit":"kU/L","unitDisplay":"kU/L","note":"Class 0, under 0.10 kU/L, is the 'none detected' cutoff that Labcorp prints as its reference interval for this test, so the range is encoded as 0 to 0.09. Quest, Labcorp and ARUP all print a result under 0.10 kU/L as class 0, and a printed 0.10 is already class 0/1 (Labcorp 'equivocal/low'). Other labs flag higher: ARUP lists a reference interval of 0.34 kU/L or lower for pigweed in its regional respiratory panels (for example Region 12), and calls 0.10 to 0.34 'clinical relevance undetermined' and for specialist use. Thermo Fisher, which makes the ImmunoCAP system, says results of 0.1 kUA/L or more indicate sensitization. A result above the range shows sensitization, not that you have an allergy. Results from different labs or assay systems are not directly comparable (WAO 2020).","sources":[{"title":"W014-IgE Pigweed, Common (test 602484)","url":"https://www.labcorp.com/tests/602484/pigweed-common","publisher":"Labcorp"},{"title":"Sample patient report: W014-IgE Pigweed, Common (test 602484)","url":"https://files.labcorp.com/testmenu-d8/sample_reports/602484.pdf","publisher":"Labcorp"},{"title":"Allergen, Weed, Pigweed (test 0055025)","url":"https://ltd.aruplab.com/Tests/Pub/0055025","publisher":"ARUP Laboratories"},{"title":"Allergen, Region 12 Respiratory Panel IgE, Arid Southwest (S. AZ, S.E. CA) (test 3001722)","url":"https://ltd.aruplab.com/Tests/Pub/3001722","publisher":"ARUP Laboratories"},{"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":"Your quick guide to using ImmunoCAP Specific IgE testing","url":"https://corporate.thermofisher.com/content/dam/phadia/library/en/Quick_guide_to_using_ImmunoCAP_Specific_IgE_testing.pdf","publisher":"Thermo Fisher Scientific (Phadia)"},{"title":"Allergen Encyclopedia: w14 Common Pigweed","url":"https://www.thermofisher.com/phadia/wo/en/resources/allergen-encyclopedia/w14.html","publisher":"Thermo Fisher Scientific (Phadia)"},{"title":"IgE allergy diagnostics and other relevant tests in allergy, a World Allergy Organization position paper","url":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7044795/","publisher":"World Allergy Organization Journal","year":2020},{"title":"Marker allergens of weed pollen: basic considerations and diagnostic benefits in the clinical routine: Part 16 of the Series Molecular Allergology","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC4479474/","publisher":"Allergo Journal International","year":2014},{"title":"Reduction of Cross-Reactive Carbohydrate Determinants in Plant Foodstuff: Elucidation of Clinical Relevance and Implications for Allergy Diagnosis","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC3056789/","publisher":"PLoS ONE","year":2011},{"title":"Allergy Blood Test","url":"https://medlineplus.gov/lab-tests/allergy-blood-test/","publisher":"MedlinePlus (National Library of Medicine)"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures IgE antibodies to pigweed pollen, which shows whether your immune system has become sensitized to this late-summer weed.","url":"https://bloodtesttracker.com/markers/ige-rough-pigweed","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}