Question

what is the most sensitive blood test for iron deficiency anemia?
serum ferritin
serum iron
bone marrow aspiration
tibc

Explanation:

Serum ferritin is a storage - form of iron in the body. Low levels are highly indicative of iron deficiency even in the early stages, making it the most sensitive blood test among the options. Serum iron can be affected by many factors, bone marrow aspiration is invasive and not a blood test, and TIBC (total iron - binding capacity) is less specific for early iron deficiency compared to serum ferritin.

Answer:

A. Serum ferritin