{"id":"wbc","name":"White Blood Cell Count","shortName":"WBC","aliases":["WBC","Leukocytes","WBC Count","White Cell Count","Total Leukocyte Count (TLC)","Leucocyte Count","Total WBC","WCC","Leucocytes","White Blood Cell Count","White Blood Cell Count (WBC)","White Blood Cells","White Cells","Leukocyte Count","Total Leucocyte Count","Total WBC Count","Glóbulos blancos","Leucocitos"],"abbreviations":["WBC","WCC"],"loinc":[{"code":"6690-2","primary":true},{"code":"26464-8","primary":false},{"code":"804-5","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":"Adults","low":3.8,"high":10.8,"unit":"10*3/uL","unitDisplay":"×10³/µL","note":"Quest Diagnostics lists 3.8–10.8 for adults over 18. Other published adult intervals differ slightly: Labcorp 3.4–10.8, OHSU 3.5–10.8, University of Iowa 3.7–10.5, American Board of Pathology 3.5–10.5, Health NZ Waikato 4.0–11.0. Healthy people of African ancestry often have lower counts (Bain 1996). People with the Duffy-null phenotype also have lower counts that are healthy for them: a 2026 single-center study of 122 healthy Duffy-null adults reported 2.43–7.05 (Barouqa 2026).","sources":[{"title":"White Blood Cell Count (WBC), test 937","url":"https://testdirectory.questdiagnostics.com/test/test-detail/937/?cc=MASTER","publisher":"Quest Diagnostics"},{"title":"CBC, Platelet, No Differential (test 028142), sample report","url":"https://files.labcorp.com/testmenu-d8/sample_reports/028142.pdf","publisher":"Labcorp","year":2020},{"title":"Heme Reference Ranges (updated 6/5/18)","url":"https://www.ohsu.edu/sites/default/files/2019-07/cbcrefrange.pdf","publisher":"Oregon Health & Science University","year":2018},{"title":"CBC reference intervals (HEM-2597.01)","url":"https://lab.waikatodhb.health.nz/assets/test-attachments/230/CBC-reference-intervals.pdf","publisher":"Te Whatu Ora Health New Zealand, Waikato","year":2024},{"title":"Hematopathology reference ranges","url":"https://abpath.org/hematopathology-reference-ranges","publisher":"American Board of Pathology"},{"title":"CBC (Complete Blood Count), Pathology Handbook","url":"https://www.healthcare.uiowa.edu/path_handbook/handbook/test299.html","publisher":"University of Iowa Hospitals & Clinics"},{"title":"Ethnic and sex differences in the total and differential white cell count and platelet count","url":"https://pubmed.ncbi.nlm.nih.gov/8881919/","publisher":"Journal of Clinical Pathology","year":1996},{"title":"Establishing Reference Intervals for White Blood Cell and Absolute Neutrophil Counts in Duffy Null Individuals","url":"https://pubmed.ncbi.nlm.nih.gov/42345734/","publisher":"Hematology Reports","year":2026}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The total number of white blood cells, the immune cells that fight infection, in a small sample of your blood.","url":"https://bloodtesttracker.com/markers/wbc","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}