A 92-year-old F from a nursing home with multiple comorbidities has a chronically low Hgb of 95. Her Ferritin is 45. You suspect she has anemia of chronic disease, but wonder if there is an element of iron deficiency anemia as well. Which component of her iron studies would indicate that she may benefit from iron supplementation?

Dr. Anton Helman is an Emergency Physician at North York General in Toronto. He is an Assistant Professor at the University of Toronto, Division of Emergency Medicine and the Education Innovation Lead at the Schwartz-Reisman Emergency Medicine Instititute. He is the founder, editor-in-chief and host of Emergency Medicine Cases.