Cough Reflex Test (CRT) Practice 2025 – Comprehensive All-in-One Resource for Exam Success!

The correct choice represents the normal range for Red Blood Cells (RBC) in males accurately. The typical reference range for RBC count in healthy adult males is indeed between 4.6 to 6.2 million cells per microliter (or x 10^6/mm³). This range is important because it reflects the necessary amount of oxygen-carrying hemoglobin present in the blood, which is essential for various physiological functions.

Values below this range may indicate conditions like anemia, which can lead to fatigue and decreased oxygen delivery to tissues. Conversely, values above this range could suggest polycythemia, a condition where there’s an excess of red blood cells, which can increase the risk of blood clots and related complications. Therefore, the specified range is crucial for diagnosing and monitoring various medical conditions related to red blood cell production and overall health.