The parameter that is expected to decrease in the early stages of iron deficiency anemia and is considered the most sensitive indicator

The parameter that is expected to decrease in the early stages of iron deficiency anemia and is considered the most sensitive indicator

• A. Serum ferritin
• B. Serum iron
• C. TIBC
• D. Transferrin

Answer: (A)

Ferritin reflects the amount of iron stored in the body, so it is the most sensitive indicator of early iron deficiency. As iron stores are first depleted, ferritin levels fall before serum iron drops or red blood cells are affected, making it the earliest and most reliable sign of developing deficiency. Keep in mind ferritin can be influenced by inflammation or infection, which can raise or normalize levels and potentially mask deficiency, so context matters. Serum iron tends to decrease later, TIBC increases as the body tries to capture more iron, and transferrin levels rise to boost iron transport—these reflect changing availability and transport rather than the stores themselves.

Ferritin reflects the amount of iron stored in the body, so it is the most sensitive indicator of early iron deficiency. As iron stores are first depleted, ferritin levels fall before serum iron drops or red blood cells are affected, making it the earliest and most reliable sign of developing deficiency. Keep in mind ferritin can be influenced by inflammation or infection, which can raise or normalize levels and potentially mask deficiency, so context matters. Serum iron tends to decrease later, TIBC increases as the body tries to capture more iron, and transferrin levels rise to boost iron transport—these reflect changing availability and transport rather than the stores themselves.