What is the approximate normal level of haematocrit/ packed cell volume in men?

Appeared in: AIIMS Patna NO - 2020

Explanation

The normal hematocrit (Hct) or packed cell volume (PCV) for adult men is approximately 40% to 50%.
This value represents the proportion of red blood cells in the total blood volume.
It is a key indicator of the blood's oxygen-carrying capacity and is a standard part of a complete blood count (CBC).
Sources confirm the normal range for men is about 40-45% (SRC_4557) or averages around 42% (SRC_4555), making 40-50% the correct option.

Option A: This range is critically low. A hematocrit this low would indicate severe, life-threatening anemia and inability to adequately oxygenate tissues.
Option B: This range is abnormally high, a condition known as polycythemia. It increases blood viscosity, raising the risk for blood clots, heart attack, and stroke.
Option D: This range is below the normal physiological level for an adult male and is indicative of anemia.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Normal laboratory values for hematocrit (Packed Cell Volume) as background academic context rather than a clinical decision trigger.
Nurses frequently monitor hematocrit levels to assess a patient's hydration status, screen for anemia, and evaluate response to treatments like blood transfusions or fluid resuscitation.
A sudden drop in hematocrit can be an early sign of acute hemorrhage (internal or external bleeding), requiring immediate nursing assessment and physician notification.
What if? If a patient with severe burns has a hematocrit of 58%, the nurse should recognize this as a sign of hemoconcentration due to massive fluid loss (dehydration) and anticipate orders for aggressive intravenous fluid replacement.

How to Approach the Question

First, identify the core of the question: it's asking for a specific normal laboratory value (hematocrit for men).
This is a factual recall question, which is common in nursing exams. These require memorization of key physiological parameters.
Scan the options to eliminate any that are clearly extreme and physiologically improbable for a normal state. For example, 5-15% is too low to sustain life normally, and 60-70% is extremely high.
Recall the general difference between male and female hematocrit levels (males are typically slightly higher due to testosterone). The range of 40-50% is the standard reference for adult males.
Select the option that encompasses the well-established normal range.

Concept Tested & Keywords

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E6 Physiology Guyton 4SAE Part 1 p. 172-174

E6 Physiology Essentials Sembulingam 10e Part 1 p. 100-102

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