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Red Blood Cell Count – Definition, Normal Values & Meaning

The red blood cell count indicates how many erythrocytes are present per microliter of blood. It is a key laboratory value for assessing blood formation and oxygen supply.

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Things worth knowing about "Red Blood Cell Count"

The red blood cell count indicates how many erythrocytes are present per microliter of blood. It is a key laboratory value for assessing blood formation and oxygen supply.

What Is the Red Blood Cell Count?

The red blood cell (RBC) count is a laboratory measurement that indicates how many erythrocytes (red blood cells) are present in a given volume of blood, typically reported as millions per microliter (Mio./µl) or per liter. Red blood cells are the most abundant cells in the blood and serve the vital function of transporting oxygen from the lungs to the body tissues while carrying carbon dioxide back to the lungs. The RBC count is a core component of the complete blood count (CBC) and provides important information about the health of the blood-forming system.

Reference Values

Normal RBC count values differ by sex and age:

Men: 4.5 – 5.9 million per microliter (Mio./µl)
Women: 4.1 – 5.1 million per microliter (Mio./µl)
Children: Values vary considerably with age; newborns typically have significantly higher counts

Values outside these reference ranges may indicate an underlying medical condition or a physiological adaptation.

Causes of an Elevated RBC Count (Polycythemia)

An abnormally high red blood cell count is referred to as polycythemia or erythrocytosis. Common causes include:

High-altitude living (physiological adaptation to reduced oxygen availability)
Chronic lung diseases (e.g., COPD)
Congenital heart defects
Smoking
Polycythemia vera (a bone marrow disorder)
Use of erythropoietin (EPO) or other performance-enhancing substances

Causes of a Low RBC Count (Anemia)

A reduced red blood cell count is characteristic of anemia. Frequent causes include:

Iron deficiency (the most common cause worldwide)
Vitamin B12 or folate deficiency
Chronic diseases (e.g., chronic kidney disease, inflammatory conditions)
Blood loss (acute or chronic)
Bone marrow disorders (e.g., aplastic anemia, leukemia)
Hemolysis (accelerated destruction of red blood cells)

Symptoms of Abnormal Values

Deviations in the RBC count can produce a range of symptoms:

With anemia: Fatigue, pallor, shortness of breath, dizziness, rapid heartbeat, reduced physical performance
With polycythemia: Headaches, facial flushing, dizziness, increased risk of blood clots (thrombosis)

Diagnosis

The red blood cell count is determined as part of a complete blood count (CBC). A blood sample is drawn from a vein, typically in the crook of the arm, and analyzed using automated cell-counting equipment. Additional parameters such as hemoglobin, hematocrit, MCV (mean corpuscular volume), and MCH (mean corpuscular hemoglobin) are measured simultaneously to help identify the specific type and cause of any blood disorder.

Treatment

Treatment depends on the underlying cause:

Iron-deficiency anemia: Iron supplements (oral or intravenous), iron-rich diet
Vitamin B12 deficiency: B12 injections or high-dose oral supplements
Folate deficiency: Folic acid supplements
Polycythemia: Treatment of the underlying condition, phlebotomy (therapeutic blood removal), medication (e.g., hydroxyurea for polycythemia vera)
Severe anemia: Blood transfusions

References

World Health Organization (WHO): Haemoglobin concentrations for the diagnosis of anaemia and assessment of severity. Geneva, 2011.
Herold, G. et al.: Internal Medicine. Eigenverlag, Cologne, 2023.
Schrier, S.L.: Approach to the adult patient with anemia. UpToDate, 2023. Available at: https://www.uptodate.com

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