Normal red blood cell count is approximately how many million cells per cubic millimeter?

Normal red blood cell count is approximately how many million cells per cubic millimeter?

• A. 2-3
• B. 4-6
• C. 6-8
• D. 8-10

Answer: (B)

Red blood cell count measures how many RBCs are present in a small volume of blood, typically reported as millions of cells per microliter (which is the same as per cubic millimeter). For healthy adults, the normal range is about four to six million RBCs per microliter. This range is the best general reference for a normal CBC value and can vary slightly with sex and age. Values substantially below this range suggest anemia, while higher values can indicate dehydration, polycythemia, or other conditions.

Red blood cell count measures how many RBCs are present in a small volume of blood, typically reported as millions of cells per microliter (which is the same as per cubic millimeter). For healthy adults, the normal range is about four to six million RBCs per microliter. This range is the best general reference for a normal CBC value and can vary slightly with sex and age. Values substantially below this range suggest anemia, while higher values can indicate dehydration, polycythemia, or other conditions.