Question

what is the most sensitive blood test for iron - deficiency anemia?
serum iron
serum ferritin
tibc
transferrin

Explanation:

Serum ferritin is a storage - form of iron in the body. In iron - deficiency anemia, it is the first to decrease as the body's iron stores are depleted. Serum iron can be affected by other factors like infection, and TIBC (total iron - binding capacity) and transferrin are more related to iron transport rather than storage levels.

Answer:

Serum Ferritin