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Review Question - QID 216736

In scope icon M 10
QID 216736 (Type "216736" in App Search)
A 71-year-old woman presents to her primary care physician with a 3-month history of increasing fatigue. Several months ago, she started noticing that she was getting tired more quickly while going out for a walk with friends, but thought that she was just getting older. Currently, she often can barely walk around the house without becoming short of breath. She has major depressive disorder and rheumatoid arthritis and lives in an old house. She started drinking more since her husband died 6 months ago. Laboratory studies are performed and selected results are shown below.

Hemoglobin: 8.9 g/dL
Mean corpuscular volume: 75 µm^3
Iron: 32 µg/dL
Total iron binding capacity: 179 µg/dL
Ferritin: 171 ng/mL

Which of the following is the most likely cause of this patient's symptoms?