MCV helps determine which of the following?

• A. Red cell distribution width
• B. Certain types of anemia
• C. Morphologic abnormalities
• D. Platelet count

Answer: (B)

MCV indicates the average red blood cell size, so it’s used to categorize anemia into microcytic, normocytic, or macrocytic patterns. This size-based classification helps narrow the likely causes: microcytic forms point toward iron deficiency, thalassemia, or sideroblastic anemia; macrocytic forms suggest vitamin B12 or folate deficiency, alcoholism, liver disease, or certain drugs; normocytic forms occur with anemia of chronic disease, acute blood loss, or hemolysis. Because of this, MCV is a key tool for identifying certain types of anemia. It doesn’t measure red cell distribution width, which is a separate parameter that reflects variation in size; it doesn’t by itself reveal morphologic abnormalities (which require a blood smear review); and it doesn’t determine platelet count (another CBC parameter).