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Review Question - QID 211048

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QID 211048 (Type "211048" in App Search)
A 67-year-old man presents to his primary care physician for fatigue. This has persisted for the past several months and has been steadily worsening. The patient has a medical history of hypertension and diabetes; however, he is not currently taking any medications and does not frequently visit his physician. His temperature is 98.7°F (37°C), blood pressure is 137/82 mmHg, pulse is 76/min, respirations are 12/min, and oxygen saturation is 99% on room air. The patient has lost 20 pounds since his last visit. His laboratory values are shown below:

Hemoglobin: 9 g/dL
Hematocrit: 29%
Mean corpuscular volume: 90 µm^3

Serum:
Na+: 139 mEq/L
Cl-: 100 mEq/L
K+: 4.3 mEq/L
Ca2+: 12.8 mg/dL

Which of the following is the most likely diagnosis?