What is the normal reference range for adult male hematocrit (Hct)?

What is the normal reference range for adult male hematocrit (Hct)?

• A. 40.7–50.3%
• B. 36.5–46.5%
• C. 45.0–55.0%
• D. 38.0–48.0%

Answer: (A)

Hematocrit shows what fraction of the blood is made up of red blood cells. In healthy adult males, the typical reference range is about 40% to 50% of blood volume. The value range 40.7–50.3% fits this common male reference interval used by many clinical labs, so it best aligns with the expected norm. The other ranges either resemble typical female values or extend beyond what is usually seen in adult men, making them less representative. Remember that lab reference ranges can vary slightly by method and population, but around 40–50% is the standard for men.

Hematocrit shows what fraction of the blood is made up of red blood cells. In healthy adult males, the typical reference range is about 40% to 50% of blood volume. The value range 40.7–50.3% fits this common male reference interval used by many clinical labs, so it best aligns with the expected norm. The other ranges either resemble typical female values or extend beyond what is usually seen in adult men, making them less representative. Remember that lab reference ranges can vary slightly by method and population, but around 40–50% is the standard for men.