NBRC Registered Respiratory Therapist (RRT) Exit Practice Exam

Normal hematocrit range is?

20-30% 40-50% 50-60% 60-70%

Correct Answer:

40-50%

Explanation:

Hematocrit is the percentage of blood volume that is occupied by red blood cells, reflecting the red cell mass relative to plasma. In healthy adults, the normal range is about 40–50%, with some variation by sex and by lab reference standards. This makes 40–50% the best choice because values below this band suggest anemia or blood loss, while values above this band point toward dehydration or polycythemia. Values far outside this range (lower around 20–30% or higher around 50–60% and above) are not considered normal for routine reference ranges.

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