American Association of Critical-Care Nurses (AACN) Certification Practice Test

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What is the normal RBC count range for a male?

3.5 - 4.5 x 10^6/uL
5.0 - 6.0 x 10^6/uL
4.5 - 5.5 x 10^6/uL
4.0 - 5.0 x 10^6/uL

The correct answer is: 4.5 - 5.5 x 10^6/uL

The normal red blood cell (RBC) count range for a male is typically between 4.5 and 5.5 x 10^6/uL. This range is established based on various physiological factors, including hematopoiesis (the formation of blood cellular components) and the average volume of circulating red blood cells necessary for optimal oxygen transport in the body. In males, who generally have a greater muscle mass and higher metabolic demand than females, the RBC count is expected to be higher to accommodate these needs. The range signifies a balance where there are sufficient red blood cells for effective oxygen delivery while avoiding conditions such as polycythemia (too many red blood cells) or anemia (too few red blood cells). This information is crucial for healthcare professionals as it helps them assess and diagnose various conditions related to blood health. Understanding normal lab values is essential for monitoring changes that can indicate health issues, such as dehydration, blood loss, or chronic disease states.