{"id":"immature-granulocytes-absolute","name":"Immature Granulocytes (Absolute)","shortName":"IG (abs)","aliases":["Immature Gran (Abs)","Immature Grans (Abs)","Absolute Immature Granulocytes","IG#","IG Abs","Immature Granulocytes #","Abs Immature Granulocytes","IG Absolute","Immature Granulocytes, Absolute","Immature Granulocyte Count","IG Count","Immature Grans (Absolute)","Immature Granulocytes (Abs)","Abs Imm Gran","Absolute IG","Immature Granulocytes Absolute Count","Granulocytes Immature (Absolute)"],"abbreviations":["IG#","IG Abs","IG (abs)"],"loinc":[{"code":"53115-2","primary":true},{"code":"51584-1","primary":false}],"specimen":"whole-blood","units":[{"ucum":"10*3/uL","display":"×10³/µL"},{"ucum":"10*9/L","display":"×10⁹/L"},{"ucum":"/uL","display":"cells/µL"}],"referenceRanges":[{"population":"18+","low":0,"high":0.1,"unit":"10*3/uL","unitDisplay":"×10³/µL","note":"Labcorp prints 0.0–0.1 ×10³/µL on its sample reports for adults (ages 40 and 46). Labcorp does not publish its age cut-offs in those samples, so the range is entered for ages 18 and over. Labcorp's pediatric reference table lists the same 0.0–0.1 for every age over 30 days and no established range up to 30 days. Other sources vary: ARUP gives 0.01–0.09 for ages 18 and over (0.2–0.9% as a percent; from its March 2021 hotline, since the ARUP test page is no longer listed), a Brazilian healthy-donor study found 0–0.06 and a Turkish hospital study of 25,431 routine results on a Sysmex XN-1000 found 0.01–0.04. A Boston outpatient study suggested upper limits of about 0.07 above age 10, with no difference between men and women. One hospital laboratory (MHCC) lists 0.0–0.5. Analyzers and populations differ, so use the range printed on your own report.","sources":[{"title":"CBC with Diff, Platelet, NLR, sample patient report (test 005013)","url":"https://files.labcorp.com/testmenu-d8/sample_reports/005013.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":"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":"Complete Blood Count (CBC) with Automated Differential (MHCC Laboratory, test CBCD)","url":"https://mhcclab.testcatalog.org/show/CBCD","publisher":"MHCC Laboratory (catalog powered by Mayo Clinic Laboratories)"},{"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"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The number of young white blood cells (immature granulocytes) in a microliter of blood. Most healthy adults have very few.","url":"https://bloodtesttracker.com/markers/immature-granulocytes-absolute","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}