Which lab finding is most concerning for anemia in an older adult male?

• A. Potassium 3.9 mEq/L
• B. Sodium 140 mEq/L
• C. Phosphate 4.1 mg/dL
• D. Hemoglobin 11.2 g/dL

Answer: (D)

Anemia is best recognized by a reduced oxygen-carrying capacity of the blood, which is most directly shown by the hemoglobin level. In an older adult male, a hemoglobin of 11.2 g/dL is well below the typical normal range and indicates anemia, warranting further evaluation for common causes like iron deficiency, chronic disease, or other etiologies. The other values (potassium, sodium, phosphate) are normal and do not indicate anemia or impaired oxygen transport. So this low hemoglobin is the most concerning finding for anemia and would prompt additional workup.