Anemia is low level of hemoglobin (Hb) in the blood for
one’s age and sex. Alterations in the level of Hb may result of changes in
plasma volume. Decreased plasma volume as in dehydration and stress polycythemia leads to a surprisingly high Hb, and
a raised plasma volume even when accompanied with a small increase in red cell
volume as seen in pregnancy leads to a spurious anemia (low Hb).
After a major hemorrhage, anemia may not be apparent until
after some days when plasma levels come back to normal.
There are various types of anemia classified in relation to
red cell indices, particularly the mcv include
-
Hypochromic microcytic with a low MCV
-
Normochromic normocytic with normal MCV
-
Macrocytic with a high MCV
They are represented in the diagram below
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