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Interpret Your Red Blood Cell Count Results
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Red Blood Cell Count Normal Ranges
The red blood cell (RBC) count measures the number of erythrocytes per microliter of blood.
| Age Group | Sex | Reference Range | Unit | Notes |
|---|---|---|---|---|
| Adults (18–64) | Male | 4.5 – 5.9 | ×10⁶/µL | — |
| Adults (18–64) | Female | 4 – 5.2 | ×10⁶/µL | — |
| Children / Pediatric | All | 3.8 – 5.5 | ×10⁶/µL | Varies widely by age |
Also reported in: ×10¹²/L.
Common Causes of High RBC
Polycythemia vera (primary bone marrow disorder)Secondary polycythemia from chronic hypoxia (COPD, sleep apnea)High-altitude adaptation
Common Causes of Low RBC
Iron deficiency anemiaAplastic anemia (bone marrow failure)Hemolytic anemia
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Reference ranges, causes, symptoms, preparation, and FAQs.