{"id":"ige-johnson-grass","name":"Johnson Grass IgE","shortName":"Johnson grass IgE","aliases":["Johnson Grass IgE","G010-IgE Johnson Grass","g10","Johnson Grass (g10) IgE","g10 IgE","Sorghum halepense IgE","Allergen, Grass, Johnson Grass","ImmunoCAP g10","Johnson Grass IgE Ab","Johnsongrass IgE","Johnson grass specific IgE"],"abbreviations":["g10"],"loinc":[{"code":"6152-3","primary":true},{"code":"102339-9","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":"Quest, Labcorp and ARUP all print a result under 0.10 kU/L as class 0 (absent, negative or no significant level detected), so this range ends at 0.09, the highest value that prints below 0.10 at two decimals. A result of 0.10 or more falls in the next class: Labcorp calls 0.10 to 0.31 class 0/I (equivocal or low), and ARUP calls 0.10 to 0.34 'clinical relevance undetermined' and says it is meant for specialist use. Thermo Fisher, which makes the ImmunoCAP assay, says results above 0.1 kUA/L are indicative of sensitization, and the older cutoff of 0.35 kU/L is still used in many studies, including the US NHANES survey. A result above the range shows sensitization, not necessarily an allergy. Use the cutoffs printed on your own report.","sources":[{"title":"Johnson Grass (test 602503)","url":"https://www.labcorp.com/tests/602503/johnson-grass","publisher":"Labcorp"},{"title":"Sample report for test 602503 (G010-IgE Johnson Grass), showing the class table","url":"https://files.labcorp.com/testmenu-d8/sample_reports/602503.pdf","publisher":"Labcorp"},{"title":"Allergen, Grass, Johnson Grass (test 0055047)","url":"https://ltd.aruplab.com/Tests/Pub/0055047","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":"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}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures IgE antibodies to Johnson grass pollen, a grass of warm climates. A higher level means sensitization, which doesn't always cause symptoms.","url":"https://bloodtesttracker.com/markers/ige-johnson-grass","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}