nRBC (Nucleated Red Blood Cells)
Nucleated red blood cells are immature erythrocytes still containing their nucleus and are normally present only in bone marrow after infancy. Their presence in adult blood suggests severe marrow stress from hemolysis, hypoxia, blood loss, or marrow infiltration, and has been associated with increased mortality in critically ill patients.
5 providers include this
Complete Blood Count (CBC)
0/100 WBC (normally absent)
What is nRBC (Nucleated Red Blood Cells)?
Nucleated red blood cells are immature erythrocytes still containing their nucleus and are normally present only in bone marrow after infancy. Their presence in adult blood suggests severe marrow stress from hemolysis, hypoxia, blood loss, or marrow infiltration, and has been associated with increased mortality in critically ill patients.
Why It Matters
Normally absent in adults. Presence indicates bone marrow stress, severe anemia, or hypoxia. Important marker for critical illness severity.
Which Providers Test nRBC (Nucleated Red Blood Cells)?
Full Provider Comparison
| Provider | Includes | Annual Cost | Biomarkers |
|---|---|---|---|
 Superpower | — | $199 | 100+ (150 with ratios) |
 WHOOP Advanced Labs | — | $349 | 65 |
 Labcorp OnDemand | — | $398 | 40+ |
| — | $486 | 40+ | |
| — | $449 | 288 | |
| ✓ | $349 | 100+ | |
| — | $829 | 54 | |
 Function Health | — | $365 | 160+ |
| — | $250 | 65 | |
| — | $495 | 80+ | |
| ✓ | $895 | 100+ | |
| ✓ | $1950 | 130+ | |
| — | $375 | 95+ | |
| — | $Varies | 75+ | |
| — | $190 | 100+ | |
| — | $99 | 50 | |
| — | $124 | 60 | |
| — | $349 | 130+ | |
| — | $349 | 80+ | |
| ✓ | $375 | 85 | |
| ✓ | $700 | 128 | |
| — | $99 | 100+ |
Frequently Asked Questions
What is nRBC (Nucleated Red Blood Cells)?
Nucleated red blood cells are immature erythrocytes still containing their nucleus and are normally present only in bone marrow after infancy. Their presence in adult blood suggests severe marrow stress from hemolysis, hypoxia, blood loss, or marrow infiltration, and has been associated with increased mortality in critically ill patients.
What is the optimal range for nRBC (Nucleated Red Blood Cells)?
The standard reference range for nRBC (Nucleated Red Blood Cells) is 0/100 WBC (normally absent). Optimal ranges may differ based on individual health goals and expert recommendations.
Which blood test providers include nRBC (Nucleated Red Blood Cells)?
5 out of 22 blood testing providers include nRBC (Nucleated Red Blood Cells) in their panels. This biomarker has limited availability.
What category does nRBC (Nucleated Red Blood Cells) fall under?
nRBC (Nucleated Red Blood Cells) is categorized under Complete Blood Count (CBC). This category includes biomarkers that help assess related aspects of health and wellness.
Medical Disclaimer
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs.
Last reviewed:2026-04-12