What is the term for the number of erythrocytes per cubic millimeter of blood?

The term "red cell count" refers specifically to the measurement of the number of erythrocytes (red blood cells) present in a cubic millimeter of blood. This count is essential in evaluating an individual’s overall health, identifying potential conditions such as anemia, polycythemia, or other blood disorders.

A higher or lower than normal red cell count can provide insights into various physiological conditions, which is why this measure is a fundamental parameter in complete blood counts (CBC).

In contrast, terms such as white cell count refer to the measurement of white blood cells, plasma count is not a standard term used in hematology, and hemoglobin concentration measures the amount of hemoglobin in the blood rather than the number of red blood cells. Each of these plays a different role in diagnostics, but none accurately describe the specific count of erythrocytes, making the red cell count the correct term in this context.