PAEA Surgery End Of Rotation (EOR) Practice Exam

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What is the classification for MCV values less than 80?

Normocytic
Macrocytic
Microcytic
Hypocytic

The correct answer is: Microcytic

MCV, or mean corpuscular volume, is a measurement used to assess the average size of red blood cells. When MCV values are less than 80 femtoliters (fL), this indicates that the red blood cells are smaller than the average size. This condition is referred to as microcytic anemia, which is typically associated with conditions such as iron deficiency anemia or thalassemia. The classification system for red blood cell size categorizes them into normocytic (normal size), macrocytic (larger than normal), and microcytic (smaller than normal). Therefore, MCV values less than 80 directly correlate to the microcytic classification, where the cells are smaller than expected. Other classifications, such as hypocytic, are not standard terms used in hematology to describe red blood cell size. Recognizing these classifications helps in diagnosing underlying causes of anemia and guiding appropriate treatment.