system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 25-year-old man comes to the physician for a 2-month history of abdominal discomfort, fatigue, and increased urinary frequency, especially at night. He has also noticed that despite eating more often he has lost 14-lbs (6-kg). He has a congenital solitary kidney and a history of Hashimoto thyroiditis, for which he takes levothyroxine. He has smoked two packs of cigarettes daily for 10 years. BMI is 18 kg/m2. His temperature is 36.7°C (98.1°F), pulse is 80/min, and blood pressure is 110/60 mm Hg. Physical examination is unremarkable. Serum studies show an osmolality of 305 mOsm/L and bicarbonate of 17 mEq/L. Urinalysis shows clear-colored urine with no organisms. Which of the following is most likely to be helpful in establishing the diagnosis?
assistant
Serum glucose