Red Blood Cell Count (RBC)
The Red Blood Cell Count (RBC) measures the number of red blood cells in a given volume of blood. It is a key indicator of the oxygen-carrying capacity of the blood and overall bone marrow function.
RBC count measures the number of red blood cells in the blood to assess oxygen transport and bone marrow function.
Key facts at a glance
- Units
- 10^6/μL
- Clinical utility
- diagnostic
- Result kind
- quantitative
- FDA-cleared
- Sysmex RBC, Abbott RBC, Siemens RBC
The RBC count is a fundamental component of a complete blood count (CBC) and is crucial for evaluating an individual's health status, especially in diagnosing anemia and polycythemia.
Normal RBC levels range from 4.2 to 6.1 million cells per microliter (10^6/μL) of blood. Deviations from this range can indicate various medical conditions.
Low RBC counts may suggest anemia, nutritional deficiencies, or bone marrow disorders, while high counts can point to dehydration, lung disease, or polycythemia vera.
Frequently asked questions
What are the symptoms of low RBC count?
How can I increase my RBC count?
Sources
- 1
- 2
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy