<prompt> Most sensitive indicator of iron deficiency anemiaPacked cell volumeHemoglobinSerum ferritinSerum iron  <response>: Ans. c Serum ferritinRef: Robbins 9thpg 649-652Among the options provided, most sensitive marker in iron deficiency anemia is Serum ferritin.Serum ferritin reflects the storage of Iron which is decreased even in the pre-latent stage of Iron deficiency Anemia and is the most sensitive marker. 