* Peripheral blood smear, which shows microcytic hypochromic red cells;
* Reduced serum ferritin;
* Reduced serum iron;
* Increased serum iron-binding capacity;
* Reduced serum iron saturation;
* Serum transferrin receptor levels;
* Raised red cell protoporphyrin;
* Therapeutic response to oral iron;
* Bone marrow aspiration showing reduced or absent stainable iron and delayed cytoplasmic maturation.
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