Red Blood Cells (Erythrocytes / RBC)

Complete Blood Count (CBC)

A healthy result should fall into the range 4.2 - 6.1 cells/mcL, 4.20 - 6.10 x10^12/L, or 4.20 - 6.10 x10/12/l.

Red blood cells (RBCs) are the most plentiful type of cell in the blood (~40% to 45% of the body's blood supply. They carry oxygen to the tissues and organs. They also bring back carbon dioxide back to the lungs so that it can be removed (exhaled) from the body. Red blood cells get their color from the protein hemoglobin. RBCs are constantly being replenished and they have a lifespan of around 120 days. Red blood cells are also known as erythrocytes, red cells, haematids, and erythroid cells. Red blood cells perform this important role for humans and are the main way that all animals with a backbone (vertebrates) get oxygen delivered to the tissues. A red blood cell count is usually performed during a routine physical and is used to help diagnose polycythemia (high red blood cell count), anemia (low blood cell count), and various other blood disorders. If an abnormality is detected, other values in the complete blood count, or CBC, are examined to identify the cause of the imbalance.

Reference Ranges for Red Blood Cells in x10E6/µL:

Men: 4.7 to 6.1

Women: 4.2 to 5.4

Children up to 18 years of age: 4.0 to 5.5

Infants: 4.8 to 7.1

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