<prompt> What does Serum ferritin levelDecreased capacity to absorb ironMicrocytic hypochromic anemiaAbsent body iron storesSideroblastic anemia  <response>: The serum ferritin level is the laboratory test to estimate iron stores. As iron stores are depleted, the serum ferritin falls to Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 847 