Nucleated Red Blood Cells (%)
Nucleated red blood cells are immature red cells that still contain a nucleus, which mature red cells normally shed before entering the bloodstream. This figure expresses how many appear relative to your white cells, and it is usually flagged automatically by the analyzer.
Healthy adult blood contains essentially no nucleated red cells, so their appearance tells your clinician the bone marrow is under unusual demand or is releasing cells early. It can also affect the accuracy of the white cell count, which is why analyzers correct for it. A notable result is often confirmed with a smear review.
The presence of nucleated red cells can accompany conditions where the body is working hard to make red cells, significant physiological stress, or certain marrow processes. In newborns a small number can be normal, but in adults any amount is generally worth a closer look. Your clinician will interpret it with your overall blood picture and clinical situation.
Zero nucleated red blood cells is the normal and expected finding in healthy adults, so a low or absent result is reassuring.
In adults the typical value is essentially none. Because this is often an automated flag, discuss any detectable result with your clinician, who may confirm it on a smear.
Sources
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.