Which pattern most strongly supports iron deficiency anemia over anemia of chronic disease?

• A. High Transferrin and High TIBC
• B. Low Ferritin
• C. Normal Transferrin Saturation
• D. Low Ferritin with High Transferrin

Answer: (A)

Iron deficiency anemia changes the body’s iron transport proteins to try to grab every bit of iron available. When iron stores are low, the liver makes more transferrin, the main iron-transport protein, and the total iron-binding capacity (TIBC) rises. This means you’ll see high transferrin levels and a high TIBC, which is a strong sign that iron stores are depleted.

In contrast, anemia of chronic disease is driven by inflammation. Transferrin behaves as a negative acute-phase reactant and tends to be low, while TIBC is normal or reduced, and ferritin is often normal or elevated due to inflammation. So a pattern with high transferrin and high TIBC fits iron deficiency far more than it fits anemia of chronic disease.

Low ferritin would also support iron deficiency, since ferritin reflects iron stores, but the specific combination of high transferrin and high TIBC is a classic discriminator that most clearly points to iron deficiency over chronic disease.