What is the concentration of red blood cells in blood?

The concentration of red blood cells in blood, also known as the red blood cell count (RBC count), varies among individuals and is influenced by factors such as age, sex, and altitude. Here are the typical ranges for red blood cell counts:

1. Men: 4.7 to 6.1 million cells per microliter (mcL) or 4.7 to 6.1 x 10^12 cells/L

2. Women: 4.2 to 5.4 million cells per micL or 4.2 to 5.4 x 10^12 cells/L

3. Children (6-12 years): 4.0 to 5.2 million cells per mcL or 4.0 to 5.2 x 10^12 cells/L

4. Infants (up to 6 months): 3.9 to 5.6 million cells per mcL or 3.9 to 5.6 x 10^12 cells/L

It's important to note that these ranges are general guidelines, and individual red blood cell counts may vary within these ranges based on various factors. If your red blood cell count falls significantly below or above the normal range, it may indicate an underlying medical condition and warrants further evaluation by a healthcare professional.