Question
The average diameter of red blood corpuscles of man is
7.2 µm
8.1 µm
9.2 µm
10.3 m
Solution
A.
7.2 µm
Normal RBCs have a diameter of 6 - 7.5 μm. On a peripheral blood smear, normal RBCs are disc-shaped with a pale-staining central area called the central pallor. When judging red cell size on a blood smear, the classic rule of thumb is to compare them to the nucleus of a small normal lymphocyte
