Red Blood Cell Count (RBC)
- Sample Type
- Standard
- Fasting
- No
- Unit
- x10^6/µL
The Red Blood Cell (RBC) count measures the absolute number of erythrocytes per microliter of blood. Within a Complete Blood Count (CBC), it is fundamental for determining the oxygen-carrying capacity of the blood. It serves as a primary indicator for diagnosing various forms of anemia, polycythemia, and the effects of bone marrow suppression. While Hemoglobin and Hematocrit are often prioritized, the RBC count is critical for calculating indices like MCV and MCH, which differentiate between microcytic, normocytic, and macrocytic anemias.
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Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
RBC counts can be falsely elevated by severe dehydration (hemoconcentration) or falsely lowered by fluid overload (hemodilution). Living at high altitudes or chronic smoking can cause a 'physiologic' elevation that might be misinterpreted as a primary blood disorder (Polycythemia Vera).
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Red Blood Cell Count (RBC):
Official Sources
Research & Guidelines
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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