Which test would be most informative for evaluating the shape and size of red blood cells?

Which test would be most informative for evaluating the shape and size of red blood cells?

• A. Hematocrit
• B. Peripheral blood smear
• C. Packed cell volume
• D. Mean corpuscular volume

Answer: (B)

Evaluating the shape and size of red blood cells is best done by directly visualizing them on a stained slide. A peripheral blood smear lets you see individual cells and assess their size relative to normal red cells, as well as identify shape abnormalities such as oval or teardrop forms, target cells, or schistocytes. This direct morphological view provides information about both size variation and cell architecture that automated counts alone can’t capture. Hematocrit (or packed cell volume) measures the proportion of blood that is made up of red cells, but it doesn’t show anything about how the cells look or vary in size. Mean corpuscular volume gives an average cell size, but it doesn’t reveal the actual distribution or any shape irregularities.

Evaluating the shape and size of red blood cells is best done by directly visualizing them on a stained slide. A peripheral blood smear lets you see individual cells and assess their size relative to normal red cells, as well as identify shape abnormalities such as oval or teardrop forms, target cells, or schistocytes. This direct morphological view provides information about both size variation and cell architecture that automated counts alone can’t capture.

Hematocrit (or packed cell volume) measures the proportion of blood that is made up of red cells, but it doesn’t show anything about how the cells look or vary in size. Mean corpuscular volume gives an average cell size, but it doesn’t reveal the actual distribution or any shape irregularities.