{"id":"immature-granulocytes-percent","name":"Immature Granulocytes (Percent)","shortName":"IG %","aliases":["Immature Granulocytes","Immature Grans","Immature Granulocytes %","IG%","Immature Gran %","Immature Grans (%)","IG %","Immature Granulocytes, %","Immature Granulocyte Percent","Immature Granulocyte %","IG Percent","Imm Gran %"],"abbreviations":["IG%"],"loinc":[{"code":"71695-1","primary":true},{"code":"38518-7","primary":false}],"specimen":"whole-blood","units":[{"ucum":"%","display":"%"}],"referenceRanges":[{"population":"18+","low":0,"high":0.9,"unit":"%","unitDisplay":"%","note":"ARUP lists 0.2 to 0.9 for ages 18 and over, and an outpatient study of more than 2,400 samples recommended 0.90% as the upper limit above age 10. OHSU lists 0.0 to 1.0 from age 1 month, a Brazilian study of 115 healthy donors found 0 to 0.63%, and a Sysmex XN-1000 hospital study found 0.10 to 0.60%. The lower limit is shown as 0 because OHSU and the Brazilian study start at 0 and the outpatient study recommends an upper limit only. Labcorp prints 'Not Estab.' (no range established) for the percent, and one health-system lab catalog lists 0 to 5%. IG depends on the analyzer, so use the range printed on your own report first.","sources":[{"title":"CBC with Platelet Count and Automated Differential (test 0040003), hotline effective March 1, 2021","url":"https://ltd.aruplab.com/api/ltd/hotline/0040003/44232","publisher":"ARUP Laboratories","year":2021},{"title":"CBC with Differential","url":"https://www.ohsu.edu/lab-services/cbc-differential","publisher":"Oregon Health & Science University (OHSU Lab Services)"},{"title":"Age-dependent reference ranges for automated assessment of immature granulocytes and clinical significance in an outpatient setting","url":"https://pubmed.ncbi.nlm.nih.gov/21466364/","publisher":"Archives of Pathology & Laboratory Medicine","year":2011},{"title":"Definition of Reference Range for the Immature Granulocytes Parameter Provided by a Hematology Analyzer","url":"https://pubmed.ncbi.nlm.nih.gov/33491418/","publisher":"Clinical Laboratory","year":2021},{"title":"Local reference intervals for MacroR, MicroR, IG% and IG# on Sysmex XN-1000: A retrospective indirect LIS-based study","url":"https://pubmed.ncbi.nlm.nih.gov/42470060/","publisher":"Medicine (Baltimore)","year":2026},{"title":"Pediatric Testing Reference Ranges","url":"https://www.labcorp.com/content/dam/labcorp/drupal/178250_DX_TL_PediatricTestRef_Final.pdf","publisher":"Labcorp"},{"title":"CBC With Differential/Platelet, sample patient report (test 005009)","url":"https://files.labcorp.com/testmenu-d8/sample_reports/005009.pdf","publisher":"Labcorp"},{"title":"Complete Blood Count (CBC) with Automated Differential (test code CBCD)","url":"https://mhcclab.testcatalog.org/show/CBCD","publisher":"MHCC Laboratory (test catalog powered by Mayo Clinic Laboratories)"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The share of your white blood cells that are young, not-yet-mature granulocytes. Clinicians read it with the rest of your CBC.","url":"https://bloodtesttracker.com/markers/immature-granulocytes-percent","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}