Trace Minerals: Deficiency & Toxicity | USMLE Step 1
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A 29-year-old woman has progressive fatigue, exertional dyspnea, and a new habit of chewing ice. Her menstrual periods last eight days, with heavy flow during the first four days. Hemoglobin is 8.9 g/dL (reference 12.0–16.0), and mean corpuscular volume is 68 fL (80–100). C-reactive protein is within the laboratory reference interval.