Ferritin stores reflect iron stores; in iron deficiency, ferritin is low. Which statement is true?

• A. Low ferritin
• B. High ferritin
• C. Normal ferritin
• D. Ferritin unchanged

Answer: (A)

Ferritin is the storage form of iron, so its level in the blood reflects how much iron is stored in the body. When iron stores are depleted, ferritin falls because there is less iron being stored. This makes a low ferritin a characteristic sign of iron deficiency and it can drop before other signs (like anemia) appear. High ferritin would suggest either plenty of iron stores or an inflammatory state that raises ferritin as an acute‑phase reactant; normal ferritin can occur if stores are adequate or if inflammation is masking an underlying deficiency. Therefore, the statement that ferritin is low in iron deficiency is the true one.