In a case of chronic iron deficiency, what is the most likely laboratory finding?

• A. Increased reticulocyte count
• B. Hypochromic microcytic erythrocytes
• C. Leukocytosis
• D. Elevated platelet count

Answer: (B)

In cases of chronic iron deficiency, the most expected laboratory finding is hypochromic microcytic erythrocytes. Iron plays a critical role in hemoglobin synthesis, and a deficiency leads to a reduced production of hemoglobin within red blood cells. As a result, the erythrocytes that are produced are smaller than normal (microcytic) and have less hemoglobin, making them appear paler (hypochromic) when stained and viewed under a microscope.

This specific morphological change in red blood cells is a direct consequence of insufficient iron, which is necessary for the normal development of red blood cells in the bone marrow. Consequently, the reduced hemoglobin content due to lower iron levels results in the characteristic appearance of these erythrocytes in blood tests commonly used to diagnose anemia.

Other possible laboratory findings such as increased reticulocyte count, leukocytosis, or elevated platelet count may occur in various contexts, but they are not characteristic of pure iron deficiency anemia. An increased reticulocyte count might be expected in response to an acute blood loss or hemolysis rather than chronic iron deficiency. Leukocytosis, which reflects increased white blood cell count, generally indicates an ongoing infection or inflammatory process rather than anemia itself.