What is the normal RBC count range for an adult female?

• A. 4.7-6.1 x10^6/µL
• B. 5.0-6.5 x10^6/µL
• C. 3.8-4.8 x10^6/µL
• D. 4.2-5.4 x10^6/µL

Answer: (D)

The normal RBC count for an adult female is about 4.2 to 5.4 million cells per microliter (4.2-5.4 x10^6/µL). This range reflects typical sex-based differences, since men usually have slightly higher counts (around 4.7-6.1 x10^6/µL) due to androgens. A range like 4.7-6.1 would be more characteristic of men, not most healthy women. A lower range such as 3.8-4.8 is too low for the majority of healthy adults, and a higher range like 5.0-6.5 is above the usual female reference and overlaps into values seen more often in men or under certain conditions.