Most sensitive and specific test for diagnosis of iron deficiency is
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
Serum iron levels
Serum ferritin levels
Serum transferrin receptor population
Transferrin saturation
Haematology