Most sensitive and specific test for diagnosis of iron deficiency is: (A) Serum iron levels, (B) Serum ferritin levels, (C) Serum transferrin receptor population, (D) Transferrin saturation
Answer is B. Ref Harrison 19 th ed pg 627,628 Under steady-state conditions, the serum ferritin level correlates with total body iron stores; thus, the serum ferritin level is the most convenient laboratory test to estimate iron stores. The normal value for ferritin varies according to the age and gender of the individual