Which of the following is the more sensitive to iron deficiency anemia? 1) serum iron . 2) serum ferretin . 3) TIBC . 4) transferrin .

thx of invitation ,  but out  of  exp.

2- serum ferritin

Body-store iron deficiency is diagnosed by tests such as a low serum ferritin, a low serum Fe level, an elevated serum transferrin and a highTIBC. A low s.ferritin is the most sensitive  lab test for iron deficiency anemia (IDA). However, serum ferritin can be elevated by any type of chronic inflammation and so is not always a reliable test of iron status if it is within normal limits (i.e. this test is meaningful if abnormally low, but less meaningful if normal).

Serum ferritin which is the storage form of iron and directly affected by deficiency of iron

I agree with Mr. Shahin answer