{"id":"nrbc-absolute","name":"Nucleated Red Blood Cells (nRBC) (Absolute)","shortName":"nRBC #","aliases":["ABSOLUTE NUCLEATED RBC","Absolute NRBC","Nucleated Red Blood Cells (Absolute)","NRBC Abs","NRBC (Absolute)","Nucleated RBC #","NRBC#","Nucleated RBC (absolute)","Nucleated Red Blood Cell #","NRBC Count","NRBC Absolute","Nucleated Red Blood Cell Count","NRBC Number"],"abbreviations":["NRBC#","nRBC#","NRBC Abs"],"loinc":[{"code":"771-6","primary":true},{"code":"30392-5","primary":false},{"code":"772-4","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"},{"ucum":"/mm3","display":"cells/mm³"}],"referenceRanges":[{"population":"0.011+","low":null,"high":0,"unit":"10*3/uL","unitDisplay":"×10³/µL","note":"Healthy people are expected to have none, so any result above 0 is usually flagged. ARUP lists 0 x10³/µL for ages 4 days and older (0.011 years is about 4 days). OHSU allows up to 0.02 at all ages. Labcorp's CBC reports nRBC only as a percent.","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)"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The number of nucleated red blood cells in each microliter of blood. Healthy people usually have none after the first weeks of life.","url":"https://bloodtesttracker.com/markers/nrbc-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."}