Question

An attending physician is evaluating a 31-year-old female patient admitted to the telemetry unit for investigation of recurrent, severe hypoglycemic episodes. The patient, who works as a neonatal intensive care nurse at another facility, has had three syncopal events accompanied by diaphoresis over the past month. During the current admission, a fasting laboratory workup during a symptomatic episode (blood glucose of $38 \text{ mg/dL}$) reveals a serum insulin level of $72 \text{ \mu U/mL}$ (normal: $< 10 \text{ \mu U/mL}$) and a C-peptide level of $0.1 \text{ ng/mL}$ (normal: $0.5 - 2.0 \text{ ng/mL}$). A plasma sulfonylurea screen is negative. Later that evening, the nursing staff discovers several used insulin syringes and empty vials of short-acting insulin concealed inside the lining of the patient's cosmetic bag. The patient has no documented history of diabetes mellitus and is currently resting comfortably in her room.

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