{"id":"ige-perennial-ryegrass","name":"Perennial Rye Grass IgE","shortName":"Ryegrass IgE","aliases":["G005-IgE Perennial Rye Grass","g5","Perennial Rye Grass IgE","G005-IgE Rye Grass, Perennial","Rye Grass, Perennial","Perennial Rye Grass","Perennial Ryegrass IgE","Ryegrass IgE","Rye grass (g5) IgE","g5 IgE","Allergen, Grass, Perennial Rye IgE","Allergen, Grass, Perennial Rye Grass","Perennial rye grass (Lolium perenne) g5","Lolium perenne IgE","ImmunoCAP g5"],"abbreviations":["g5","G005"],"loinc":[{"code":"7369-2","primary":true},{"code":"112116-9","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 perennial rye 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. The older 0.35 kU/L cutoff is still used in many studies, including the US NHANES survey. 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":"G005-IgE Rye Grass, Perennial (test 602543)","url":"https://www.labcorp.com/tests/602543/rye-grass-perennial","publisher":"Labcorp"},{"title":"Sample patient report: G005-IgE Rye Grass, Perennial (test 602543)","url":"https://files.labcorp.com/testmenu-d8/sample_reports/602543.pdf","publisher":"Labcorp"},{"title":"Allergen, Grass, Perennial Rye Grass (test 0055028)","url":"https://ltd.aruplab.com/Tests/Pub/0055028","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: g5 Rye grass","url":"https://www.thermofisher.com/phadia/wo/en/resources/allergen-encyclopedia/g5.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":"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":"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 perennial ryegrass pollen, which shows whether your immune system has become sensitized to this common grass.","url":"https://bloodtesttracker.com/markers/ige-perennial-ryegrass","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}