In normal healthy female , the number of RBC/m`m^(3)` of blood is

Options

A. 6.5-7.0 million
B. 5.5-6.0 million
C. 4.5-5.0 million
D. 3.5-4.0 million

Answer

To determine the normal range of red blood cells (RBCs) in a healthy female, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the normal number of RBCs per cubic millimeter (mm³) of blood in a healthy female.

2. **Know the Normal Range**: It is important to know the typical range of RBCs in females. Generally, the normal range for RBCs in healthy females is approximately 4.5 to 5 million cells per microliter (µL) of blood.

3. **Convert Microliters to Cubic Millimeters**: Since 1 microliter (µL) is equivalent to 1 cubic millimeter (mm³), the range remains the same when we express it in mm³. Therefore, the normal range for RBCs in females is still 4.5 to 5 million RBCs/mm³.

4. **Identify the Correct Option**: From the options provided in the question:
- 6.5 to 7 million
- 5.5 to 6 million
- **4.5 to 5 million** (this is the correct answer)
- 3.5 to 4 million

5. **Conclusion**: The correct answer for the number of RBCs in a normal healthy female is **4.5 to 5 million RBCs/mm³**.