Most sensitive and specific test for diagnosis of iron deficiency is:
b. Serum ferritin levels(Ref: Nelson's 20/e p 2323-2325, Ghai 8/e p 334-335)Low serum ferritin level invariably indicates iron deficiency and hence it is the most specific and sensitive test for iron deficiency anemia.
Serum iron level
Serum ferritin levels
Serum transferrin receptor populations
Transferrin saturation
C.V.S.