This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Iron deficiency anemia, Subject name: Pathology
All are reduced in iron deficiency anemia EXCEPT: 
Select and explain. 
A. Total iron binding capacity, B. Percentage saturation of Transferrin, C. Hemoglobin level, D. Serum ferritin
A: Total iron binding capacity
Answer: A: Total iron binding capacity 
Explanation: - In iron deficiency anemia as % saturation of transferrin decreases, total iron binding capacity increases. Other parameters seen in IDA are: serum ferritin | Transferrin levels | Serum iron levels | Free erythrocyte protoporphyrin ||| Mentzer index || . CBC: |Hb, MCH |, MCV |, MCHC |