Diabetes Mellitus USMLE Step 1 Practice Question
A 43-year-old woman presents with recurrent episodes of diaphoresis, tremor, and confusion that resolve after consuming juice. Vital signs show HR 102, BP 138/88, RR 16, temp 37°C. During a 72-hour supervised fast, plasma glucose drops to 42 mg/dL with inappropriately elevated insulin (18 mIU/L) and C-peptide (2.1 ng/mL). Liver function tests are normal. Which of the following is the most likely diagnosis?
Answer choices
- APheochromocytoma
- BExogenous insulin administration
- CInsulinomaCorrect answer
- DSulfonylurea use
- EAddison disease
- FFactitious hypoglycemia from surreptitious glucagon injection
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