Review Question - QID 210873

A 65-year-old man presents to his primary care physician for a yearly checkup. He states he feels he has been in good health other than minor fatigue, which he attributes to aging. The patient has a past medical history of hypertension and is currently taking chlorthalidone. He drinks 1 glass of red wine every night. He has lost 5 pounds since his last appointment 4 months ago. His temperature is 99.2°F (37.3°C), blood pressure is 147/98 mmHg, pulse is 80/min, respirations are 14/min, and oxygen saturation is 99% on room air. Physical exam reveals an obese man in no acute distress. Laboratory values are ordered as seen below.

Hemoglobin: 9 g/dL
Hematocrit: 27%
Mean corpuscular volume: 72 µm^3
Leukocyte count: 6,500/mm^3 with normal differential
Platelet count: 193,000/mm^3

Serum:
Na+: 139 mEq/L
Cl-: 101 mEq/L
K+: 4.3 mEq/L
HCO3-: 25 mEq/L
BUN: 20 mg/dL
Glucose: 99 mg/dL
Creatinine: 1.1 mg/dL
Ca2+: 9.0 mg/dL
AST: 32 U/L
ALT: 20 U/L
25-OH vitamin D: 15 ng/mL

Which of the following is the most appropriate next step in management?